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In that case, you only need to get the project code and install the dependencies with Composer. Assuming your team uses Git, setup your project with the following commands:. You'll probably also need to customize your. When working on a existing Symfony application for the first time, it may be useful to run this command which displays information about the project:. A common practice when developing Symfony applications is to install packages Symfony calls them bundles that provide ready-to-use features.

Packages usually require some setup before using them editing some file to enable the bundle, creating some file to add some initial config, etc. Technically speaking, Symfony Flex is a Composer plugin that is installed by default when creating a new Symfony application and which automates the most common tasks of Symfony applications. You can also add Symfony Flex to an existing project.

Symfony Flex modifies the behavior of the require , update , and remove Composer commands to provide advanced features. Consider the following example:. If you execute that command in a Symfony application which doesn't use Flex, you'll see a Composer error explaining that logger is not a valid package name.

However, if the application has Symfony Flex installed, that command installs and enables all the packages needed to use the official Symfony logger. Flex keeps tracks of the recipes it installed in a symfony. Symfony Flex recipes are contributed by the community and they are stored in two public repositories:. Read the Symfony Recipes documentation to learn everything about how to create recipes for your own packages.

The symfony binary created when you install Symfony provides a command to check whether your project's dependencies contain any known security vulnerability:. A good security practice is to execute this command regularly to be able to update or replace compromised dependencies as soon as possible.

The security check is done locally by cloning the public PHP security advisories database , so your composer. The check:security command terminates with a non-zero exit code if any of your dependencies is affected by a known security vulnerability. This way you can add it to your project build process and your continuous integration workflows to make them fail when there are vulnerabilities. According to the Symfony release process , "long-term support" or LTS for short versions are published every two years. Check out the Symfony roadmap to know which is the latest LTS version. By default, the command that creates new Symfony applications uses the latest stable version.

If you want to use an LTS version, add the --version option:. The Symfony Demo Application is a fully-functional application that shows the recommended way to develop Symfony applications. It's a great learning tool for Symfony newcomers and its code contains tons of comments and helpful notes. With setup behind you, it's time to Create your first page in Symfony. Amsterdam Nov. Lille France March 1 , Paris France March , Tunis Tunisia April 27 , You can list the files they installed in a Terminal by.

The installer will remove any previous version 21 of the R framework which it finds installed. This can be avoided by using pkgutil --forget see the previous section. However, R. A small utility, Rswitch. This is of limited use as R. APP is compiled against a particular version of R and will likely crash if switched to an earlier version. This may allow you to install a development version of R de-selecting R. APP and then switch back to the release version. You should ensure that the shell has set adequate resource limits: R expects a stack size of at least 8MB and to be able to open at least file descriptors.

For some compilers 22 and packages a larger stack size has been needed: MB has sufficed to date. Various environment variables can be set to determine where R creates its per-session temporary directory. It is helpful to use the correct terminology. A package is loaded from a library by the function library. Changing the set of default packages is normally used to reduce the set for speed when scripting: in particular not using methods will reduce the start-up time by a factor of up to two.

But it can also be used to customize R, e. R packages are installed into libraries , which are directories in the file system containing a subdirectory for each package installed there. Both sites and users can create others and make use of them or not in an R session. Packages may be distributed in source form or compiled binary form.

Binary packages are platform-specific and generally need no special tools to install, but see the documentation for your platform for details. Note that you may need to specify implicitly or explicitly the library to which the package is to be installed. This is only an issue if you have more than one library, of course. Alternatively, packages can be downloaded and installed from within R. Then download and install packages pkg1 and pkg2 by. The essential dependencies of the specified packages will also be fetched. Unless the library is specified argument lib the first library in the library search path is used: if this is not writable, R will ask the user in an interactive session if the default personal library should be created, and if allowed to will install the packages there.

If you want to fetch a package and all those it depends on in any way that are not already installed, use e. Function setRepositories can select amongst those repositories that the R installation is aware of. Naive users sometimes forget that as well as installing a package, they have to use library to make its functionality available. What install. On Windows it looks by default first at the list of binary versions of packages available for your version of R and downloads the latest versions if any.

On Windows install. Windows binary packages for R are distributed as a single binary containing either or both architectures and bit. No additional tools are needed if the package does not contain compiled code, and install. It will report success if the installation of the architecture of the running R succeeded, whether or not the other architecture was successfully installed.

The exceptions are packages with a non-empty configure. If configure. This can only be applied to a tarball, and will only succeed if both installs succeed. If you have a package without compiled code and no Windows-specific help, you can zip up an installation on another OS and install from that zip file on Windows. However, such a package can be installed from the sources on Windows without any additional tools.

Packages with compiled code may need to have paths to the compilers set explicitly, and there is provision to make use of a system-wide library of installed external software. The R. On R builds using binary packages, the default is type both : this looks first at the list of binary packages available for your version of R and installs the latest versions if any.

Note that most binary packages which include compiled code are tied to a particular series e. Installing source packages which do not contain compiled code should work with no additional tools. Package rJava and those which depend on it need a Java runtime installed and several packages need X11 installed, including those using Tk.

A few of the binary packages need other software to be installed on your system. Apple includes many Open Source libraries in macOS but increasingly without the corresponding headers not even in Xcode nor the Command Line Tools : they are often rather old versions.

Note that this mechanism can also be used when it necessary to change the optimization level for a particular package. For example. Another use is to override the settings in a binary installation of R. For example, to use a different Fortran compiler on macOS. There is also provision for a site-wide Makevars. Fortunately such packages are unusual.

When installing packages from their sources, there are some extra considerations on installations which use sub-architectures. These are commonly used on Windows but can in principle be used on other platforms. When a source package is installed by a build of R which supports multiple sub-architectures, the normal installation process installs the packages for all sub-architectures. The exceptions are. In those cases only the current architecture is installed. Further sub-architectures can be installed by.

Some R packages contain compiled code which links to external software libraries. Unless the external library is statically linked which is done as much as possible for binary packages on Windows and macOS , the libraries have to be found when the package is loaded and not just when it is installed. How this should be done depends on the OS and in some cases the version. For Unix-alikes except macOS the primary mechanism is the ld. Standard library locations will be covered by the cache, and well-designed software will add its locations as for example openmpi does on Fedora. On macOS the primary mechanism is to embed the absolute path to dependent dynamic libraries into an object when it is compiled.

Running R CMD otool -L on the package shared object will show where if anywhere its dependencies are resolved. The danger with any of the methods which involve setting environment variables is of inadvertently masking a system library. The command update. It downloads the list of available packages and their current versions, compares it with those installed and offers to fetch and install any that have later versions on the repositories.

An alternative interface to keeping packages up-to-date is provided by the command packageStatus , which returns an object with information on all installed packages and packages available at multiple repositories. The print and summary methods give an overview of installed and available packages, the upgrade method offers to fetch and install the latest versions of outdated packages.

One sometimes-useful additional piece of information that packageStatus returns is the status of a package, as "ok" , "upgrade" or "unavailable" in the currently selected repositories. Utilities such as install. Under that base URL there should be directory trees for one or more of the following types of package distributions:.

If you have a mis-configured server that does not report correctly non-existent files you may need these files. To add your repository to the list offered by setRepositories , see the help file for that function. Incomplete repositories are better specified via a contriburl argument than via being set as a repository.

It can be convenient to run R CMD check on an installed package, particularly on a platform which uses sub-architectures. The outline of how to do this is, with the source package in directory pkg or a tarball filename :. Where sub-architectures are in use the R CMD check line can be repeated with additional architectures by. If multiple sub-architectures fail only because they need different settings, e.

So on Windows to install, check and package for distribution a source package from a tarball which has been tested on another platform one might use. Internationalization refers to the process of enabling support for many human languages, and localization to adapting to a specific country and language. Current builds of R support all the character sets that the underlying OS can handle. These are interpreted according to the current locale , a sufficiently complicated topic to merit a separate section.

Note though that R has no built-in support for right-to-left languages and bidirectional output, relying on the OS services. For example, how character vectors in UTF-8 containing both English digits and Hebrew characters are printed is OS-dependent and perhaps locale-dependent. The other aspect of the internationalization is support for the translation of messages. This is enabled in almost all builds of R. A locale is a description of the local environment of the user, including the preferred language, the encoding of characters, the currency used and its conventions, and so on.

Aspects of the locale are accessed by the R functions Sys. The system of naming locales is OS-specific. There is quite wide agreement on schemes, but not on the details of their implementation. A locale needs to specify. R is principally concerned with the first for translations and third. Note that the charset may be deducible from the language, as some OSes offer only one charset per language. See man locale and locale -a for more details. Windows also uses locales, but specified in a rather less concise way.

For example, chinese is Traditional Chinese and not Simplified Chinese as used in most of the Chinese-speaking world. Internally macOS uses a form similar to Linux: the main difference from other Unix-alikes is that where a character set is not specified it is assumed to be UTF The preferred language for messages is by default taken from the locale. The last three are normally used to set the locale and so should not be needed, but the first is only used to select the language for messages.

It is usually possible to change the language once R is running via not Windows Sys. But this is OS-specific, and has been known to stop working on an OS upgrade. Messages are divided into domains , and translations may be available for some or all messages in a domain. R makes use of the following domains.

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Dividing up the messages in this way allows R to be extensible: as packages are loaded, their message translation catalogues can be loaded too. R-level and C-level domains are subtly different, for example in the way strings are canonicalized before being passed for translation. However, if a specific translation catalogue exists but does not contain a translation, the less specific catalogues are consulted. Translations in the right language but the wrong charset are made use of by on-the-fly re-encoding.

Almost all current CPU s have both and bit sets of instructions. For most a bit version is the default, but for some e. The principal difference is in the size of the pointers. R allocates memory for large objects as needed, and removes any unused ones at garbage collection.

When the sizes of objects become an appreciable fraction of the address limit, fragmentation of the address space becomes an issue and there may be no hole available that is the size requested. This can cause more frequent garbage collection or the inability to allocate large objects.

So, for speed you may want to use a bit build especially on a laptop , but to handle large datasets and perhaps large files a bit build. You can often build both and install them in the same place: See Sub-architectures. This is done for the Windows binary distributions. Even on bit builds of R there are limits on the size of R objects see help "Memory-limits" , some of which stem from the use of bit integers especially in Fortran code. The routines supporting the distribution and special 38 functions in R and a few others are declared in C header file Rmath.

These can be compiled into a standalone library for linking to other applications. Note that they are not a separate library when R is built, and the standalone version differs in several ways. A little care is needed to use the random-number routines. You will need to supply the uniform random number generator. This takes values from the enumeration type. If R has not already been made in the directory tree, configure must be run as described in the main build instructions. The example file test.

Note that you will probably not be able to run it unless you add the directory containing libRmath. You need to set up 39 almost all the tools to make R and then run in a Unix-like shell. This creates a static library libRmath. If you want an import library libRmath. This will use the first found of libRmath. You should be able to force static or dynamic linking via.

It is possible to link to Rmath. Auto-import will probably work with MinGW-w64, but it is better to be sure. This appendix gives details of programs you will need to build R on Unix-like platforms, or which will be used by R if found by configure. You need a means of compiling C and Fortran 90 see Using Fortran. For versions of gcc prior to 5. Note that options essential to run the compiler even for linking, such as those to set the architecture, should be specified as part of CC rather than in CFLAGS. The command-line editing and command completion depends on the GNU readline library including its headers : version 4.

A suitably comprehensive iconv function is essential. The OS needs to have enough support 45 for wide-character types: this is checked at configuration. Some C99 functions 46 are required and checked for at configuration. Installations of zlib version 1. PCRE 50 version 8. The --enable-jit flag is supported for most common CPUs. See also the comments for Solaris. Library libcurl version 7. Information on libcurl is found from the curl-config script: if that is missing or needs to be overridden 52 there are macros to do so described in file config. A tar program is needed to unpack the sources and packages including the recommended packages.

A version 53 that can automagically detect compressed archives is preferred for use with untar : the configure script looks for gtar and gnutar before tar — use environment variable TAR to override this.

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You will not be able to build most of the manuals unless you have texi2any version 5. To make PDF versions of the manuals you will also need file texinfo. If you want to build from the R Subversion repository then texi2any is highly recommended as it is used to create files which are in the tarball but not stored in the Subversion repository. Building PDF package manuals including the R reference manual and vignettes is sensitive to the version of the LaTeX package hyperref and we recommend that the TeX distribution used is kept up-to-date. Note that package hyperref currently requires packages kvoptions , ltxcmds and refcount.

The essential programs should be in your PATH at the time configure is run: this will capture the full paths. The liblzma library is in the public domain and X11, libbzip2 , libcurl and zlib have MIT-style licences. The ability to use translated messages makes use of gettext and most likely needs GNU gettext : you do need this to work with new translations, but otherwise the version contained in the R sources will be used if no suitable external gettext is found. Cairo version 1. Pango needs to be at least version 1. For Fedora users we believe the pango-devel RPM and its dependencies suffice.

These tests will fail if pkg-config is not installed 55 , and are likely to fail if cairo was built statically unusual. For the best font experience with these devices you need suitable fonts installed: Linux users will want the urw-fonts package. On platforms which have it available, the msttcorefonts package 56 provides TrueType versions of Monotype fonts such as Arial and Times New Roman.

See the R help on X11 on selecting such fonts. The bitmapped graphics devices jpeg , png and tiff need the appropriate headers and libraries installed: jpeg version 6b or later, or libjpeg-turbo or libpng version 1. They also need support for either X11 or cairo see above. Should support for these devices not be required or broken system libraries need to be avoided there are configure options --without-libpng , --without-jpeglib and --without-libtiff. The TIFF library has many optional features such as jpeg , libz , lzma , jbig and jpeg12 , none of which is required for the tiff devices but may need to be present to link the library usually only an issue for static linking.

Option --with-system-tre is also available: it needs a recent version of TRE. An implementation of XDR is required, and the R sources contain one which is likely to suffice although a system version may have higher performance. Use of the X11 clipboard selection requires the Xmu headers and libraries. These are normally part of an X11 installation e. Some systems notably macOS and at least some FreeBSD systems have inadequate support for collation in multibyte locales.

It will be used by default where available: should a very old or broken version of ICU be found this can be suppressed by --without-ICU. At the time of writing a full installation on Fedora Linux used the following packages and their development versions, and this may provide a useful checklist for other systems:. Note that the tk. The build process looks for Java support on the host system, and if it finds it sets some settings which are useful for Java-using packages such as rJava and JavaGD : these require a full JDK.

This check can be suppressed by configure option --disable-java. See R CMD javareconf --help for details: note that this needs to be done by the account owning the R installation. Renviron , which suffices to run already-installed Java-using packages. It may be possible to avoid this by specifying an invariant link as the path when configuring. For example, on that system any of.

However, Linux distributions can be confusing: for example Fedora 28 had. At the time of writing java-openjdk was Java For source files with extension. Note that it is detected by the name of the command without a test that it can actually compile Fortran 90 code. However, these have to be explicitly requested at configure time: R provides an internal BLAS which is well-tested and will be adequate for most uses of R.

You can specify a particular BLAS library via a value for the configuration option --with-blas and not to use an external BLAS library by --without-blas the default. If neither the option nor the environment variable supply a value, a search is made for a suitable 61 BLAS. The configure code checks that the external BLAS is complete it must include all double precision and double complex routines, as well as LSAME , and appears to be usable.

However, an external BLAS has to be usable from a shared object so must contain position-independent code , and that is not checked.

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The correct incantation for these is often found via --with-blas with no value on the appropriate platforms. Some of the external BLAS es are multi-threaded. On a machine running other tasks, there can be contention for CPU caches that reduces the effectiveness of the optimization of cache use by a BLAS implementation: some people warn that this is especially problematic for hyperthreaded CPUs. So if R is re-built to use an enhanced BLAS then packages such as quantreg will need to be re-installed; they may be under other circumstances.

This is checked in the test suite. External BLAS implementations often make less use of extended-precision floating-point registers where available and will almost certainly re-order computations. This can result in less accuracy than using a reference BLAS , and may result in different solutions, e. The URIs for several of these BLAS have been subject to frequent gratuitous changes, so you will need to search for their current locations. The reference implementations are thread-safe but external ones may not be even single-threaded ones : this can lead to hard-to-track-down incorrect results or segfaults.

Unfortunately it is built by default as a static library that on some platforms may not be able to be used with shared objects such as are used in R packages. Such builds can be used by one of. Consult its installation guide 64 for how to build ATLAS as a shared library or as a static library with position-independent code on platforms where that matters.

For the Fedora libraries the compile-time flag specifies 4 threads. There are also versions of MKL for macOS 67 and Windows, but when these have been tried they did not work with the default compilers used for R on those platforms. The MKL interface has changed several times and may change again: the following examples have been used with versions For example, just. A similar link works for most versions of the OpenBLAS provided the appropriate lib directory is in the run-time library path or ld. Note that rebuilding or symlinking libRblas.

This can only be done if --with-blas has been used. However, the likely performance gains are thought to be small and may be negative. You can specify a specific LAPACK library or a search for a generic library by the configuration option --with-lapack. If you do use --with-lapack , be aware of potential problems with bugs in the LAPACK sources or in the posted corrections to those sources. Other potential problems are incomplete versions of the libraries, seen several times in Linux distributions over the years.

Reporting problems where it is used unnecessarily will simply irritate the R helpers. As with all libraries, you need to ensure that they and R were compiled with compatible compilers and flags. For example, this has meant that on Sun Sparc using the Oracle compilers the flag -dalign is needed if sunperf is to be used. Probably the most important ones not covered elsewhere are defaults in brackets.

You will want to use --disable-R-profiling if you are building a profiled executable of R e. Flag --enable-R-shlib causes the make process to build R as a dynamic shared library, typically called libR. This can only be done if all the code including system libraries can be compiled into a dynamic library, and there may be a performance 68 penalty. So you probably only want this if you will be using an application which embeds R. Note that C code in packages installed on an R system linked with --enable-R-shlib is linked against the dynamic library and so such packages cannot be used from an R system built in the default way.

Also, because packages are linked against R they are on some OSes also linked against the dynamic libraries R itself is linked against, and this can lead to symbol conflicts. For maximally effective use of valgrind , R should be compiled with valgrind instrumentation. Level 0 is the default and does not add anything. The system headers for valgrind can be requested by option --with-system-valgrind-headers : they will be used if present on Linux they may be in a separate package such as valgrind-devel.

Note though that there is no guarantee that the code in R will be compatible with very old 69 or future valgrind headers. If you need to re-configure R with different options you may need to run make clean or even make distclean before doing so. The configure script has other generic options added by autoconf and which are not supported for R: in particular building for one architecture on a different host is not possible.

Translation of messages is supported via GNU gettext unless disabled by the configure option --disable-nls. If you need or want to set certain configure variables to something other than their default, you can do that by either editing the file config. If you are building in a directory different from the sources, there can be copies of config.

There is also a general autoconf mechanism for config. These variables are precious , implying that they do not have to be exported to the environment, are kept in the cache even if not specified on the command line, checked for consistency between two configure runs provided that caching is used , and are kept during automatic reconfiguration as if having been passed as command line arguments, even if no cache is used.

See the variable output section of configure --help for a list of all these variables. If you find you need to alter configure variables, it is worth noting that some settings may be cached in the file config. Note that caching is turned off by default: use the command line option --config-cache or -C to enable caching.

This is used both when configuring R to set the default, and when running R to override the default. It is also used to set the paper size when making PDF manuals. If you have libraries and header files, e. In this case, use a different compiler or a front-end shell script which does the re-ordering.

These flags can also be used to build a faster-running version of R. Tuning compilation to a specific CPU family e. To compile R, you need a Fortran 90 compiler. The current default is to search for gfortran , g95 , xlf95 f95 , fort , ifort , ifc , efc , pgfortran , pgf95 lf95 , ftn , nagfor , xlf90 , f90 , pgf90 , pghpf , epcf Note that these are searched for by name, without checking the standard of Fortran they support.

The search mechanism can be changed using the configure variable FC which specifies the command that runs the Fortran compiler. If your Fortran compiler is in a non-standard location, you should set the environment variable PATH accordingly before running configure , or use the configure variable FC to specify its full path.

You must set whatever compilation flags if any are needed to ensure that Fortran integer is equivalent to a C int pointer and Fortran double precision is equivalent to a C double pointer. This is checked during the configuration process.

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A wide range of flags can be set in the file config. We have already mentioned. Since R as a shared library has about symbols, if in doubt use the larger version. There are several files that are part of the R sources but can be re-generated from their own sources by configuring with option --enable-maintainer-mode and then running make in the build directory. This requires other tools to be installed, discussed in the rest of this section. File configure is created from configure. There is a formal version requirement on autoconf of 2.

It is known that earlier versions of bison generate code which reads and in some cases writes outside array bounds: bison 2. The ultimate sources for package compiler are in its noweb directory. Some Linux distributions include this command in package noweb. This section provides some notes on building R on different Unix-alike platforms.

These notes are based on tests run on one or two systems in each case with particular sets of compilers and support libraries. Success in building R depends on the proper installation and functioning of support software; your results may differ if you have other versions of compilers and support libraries.

C macros to select particular platforms can be tricky to track down there is a fair amount of misinformation on the Web. As its name implies, it displays on a local or remote X server, and relies on the services provided by the X server. When X11 was designed, most displays were around 75dpi, whereas today they are of the order of dpi or more. If you find that X11 is reporting 72 missing font sizes, especially larger ones, it is likely that you are not using scalable fonts and have not installed the dpi versions of the X11 fonts.

More complicated problems can occur in non-Western-European locales, so if you are using one, the first thing to check is that things work in the C locale. The likely issues are a failure to find any fonts or glyphs being rendered incorrectly often as a pair of ASCII characters. X11 works by being asked for a font specification and coming up with its idea of a close match. For text as distinct from the symbols used by plotmath , the specification is the first element of the option "X11fonts" which defaults to. If you are using a single-byte encoding, for example ISO in Eastern Europe or KOI8-R in Russian, use xlsfonts to find an appropriate family of fonts in your encoding the last field in the listing.

Multi-byte encodings most commonly UTF-8 are even more complicated. In such locales fontsets are used, made up of fonts encoded in other encodings. If not, you may have to get hold of a suitable locale entry for X On some systems scalable fonts are available covering a wide range of glyphs. Another is Type 1 fonts: the URW set of Type 1 fonts provides standard typefaces such as Helvetica with a larger coverage of Unicode glyphs than the standard X11 bitmaps, including Cyrillic.

These are generally not part of the default install, and the X server may need to be configured to use them. They might be under the X11 fonts directory or elsewhere, for example,. Linux is the main development platform for R, so compilation from the sources is normally straightforward with the most common compilers and libraries.

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Recall that some package management systems such as RPM and deb make a distinction between the user version of a package and the developer version. You should expect to see in the configure summary. When R has been installed from a binary distribution there are sometimes problems with missing components such as the Fortran compiler.

It is also possible to increase the optimization levels to -O3 : however for many versions of the compilers this has caused problems in at least one CRAN package. It may also be necessary to set the pkg-config path, e. For the latter, if the Fortran compiler is GNU gfortran or possibly g77 the flags. These take very similar options to the corresponding GCC compilers. This has to be used in conjunction with a Fortran compiler: the configure code will remove -lgcc from FLIBS , which is needed for some versions of gfortran.

Recent versions have optional when built OpenMP support. This needs something like. Note that flang accepts all the flags which clang does the driver is a modified version of clang , and flang is a symbolic link to clang , but does not implement all of them for Fortran compilation: it also accepts most PGI-style flags such as -mp for OpenMP.

It currently produces few diagnostics even with -Wall -pedantic. So it may be necessary to disable the latter by configuring R using --disable-openmp. Brian Ripley used version 9. Others have reported success with versions R can in principle be built for If you have a fresh OS installation, running e.

If you have installed Xcode, this provides the command-line tools. The tools will need to be reinstalled when macOS is upgraded, as upgrading partially removes them. For macOS This will need to be re-run if the OS decides to update the Command Line Tools: betas of version 11 are not currently supported.

Alternatively, change the include path via. Which is said to be going to be needed for future versions of macOS. The location of the SDK, which could change, can be found by running xcrun -show-sdk-path. It is likely that the compilers included in the Command Line Tools will find the headers under the SDK without this additional step, but other versions of clang will not. You need GNU readline. This option needs an Objective-C compiler 76 which can compile the source code of quartz. Use --without-aqua if you want a standard Unix-alike build: apart from disabling quartz and the ability to use the build with R.

APP , it also changes the default location of the personal library see?. An Apple package for 6. Current CRAN binary distributions use the build of clang 7. In particular, all of these include support for OpenMP which Apple builds of clang do not. Then R could be configured by something like. If this works, you should see the line. You will most likely want at least jpeg and tiff. The pkg-config utility is not provided by Apple and used for the installation from source of many packages: it will also be used if present when configuring the X11 and bitmap devices.