CGAL 5.3 - Manual
Summary of CGAL's Configuration Variables

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This page lists CMake variables which you can use to help CMake find missing dependencies while using the command line. We however recommend using the graphical interface (cmake-gui).

# Summary of CGAL's Configuration Variables

Most configuration variables are not environment variables but CMake variables. They are given in the command line to CMake via the -D option, or passed from the interactive interface of cmake-gui. Unless indicated differently, all the variables summarized below are CMake variables.

## Component Selection

The following boolean variables indicate which CGAL components to configure and/or build. Their values can be ON or OFF.

Variable Default Value
WITH_examples OFF
WITH_demos OFF
WITH_CGAL_Core ON
WITH_CGAL_Qt5 ON
WITH_CGAL_ImageIO ON

## Compiler and Linker Flags

The following variables specify compiler and linker flags. Each variable holds a space-separated list of command-line switches for the compiler and linker and their default values are automatically defined by CMake based on the target platform.

Have in mind that these variables specify a list of flags, not just one single flag. If you provide your own definition for a variable, you will entirely override the list of flags chosen by CMake for that particular variable.

The variables that correspond to both debug and release builds are always used in conjunction with those for the specific build type.

Program Both Debug and Release Release Only Debug Only
C++ Compiler CMAKE_CXX_FLAGS CMAKE_CXX_FLAGS_RELEASE CMAKE_CXX_FLAGS_DEBUG
Linker (shared libs) CMAKE_SHARED_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS_RELEASE CMAKE_SHARED_LINKER_FLAGS_DEBUG
Linker (static libs) CMAKE_MODULE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS_RELEASE CMAKE_MODULE_LINKER_FLAGS_DEBUG
Linker (programs) CMAKE_EXE_LINKER_FLAGS CMAKE_EXE_LINKER_FLAGS_RELEASE CMAKE_EXE_LINKER_FLAGS_DEBUG

## Additional Compiler and Linker Flags

The following variables can be used to add flags without overriding the ones defined by cmake.

Program Both Debug and Release Release Only Debug Only
C++ Compiler CGAL_CXX_FLAGS CGAL_CXX_FLAGS_RELEASE CGAL_CXX_FLAGS_DEBUG
Linker (shared libs) CGAL_SHARED_LINKER_FLAGS CGAL_SHARED_LINKER_FLAGS_RELEASE CGAL_SHARED_LINKER_FLAGS_DEBUG
Linker (static libs) CGAL_MODULE_LINKER_FLAGS CGAL_MODULE_LINKER_FLAGS_RELEASE CGAL_MODULE_LINKER_FLAGS_DEBUG
Linker (programs) CGAL_EXE_LINKER_FLAGS CGAL_EXE_LINKER_FLAGS_RELEASE CGAL_EXE_LINKER_FLAGS_DEBUG

## Miscellaneous Variables

Note that the default build type is Debug, which should only be used to debug and will serverly limit performances.

Variable Description Type Default Value
CMAKE_BUILD_TYPE Indicates type of build. Possible values are 'Debug' or 'Release' CMake
CMAKE_INSTALL_PREFIXInstallation directory path CMake Debug
CMAKE_C_COMPILER Full-path to the executable corresponding to the C compiler to use. CMake platform-dependent
CMAKE_CXX_COMPILER Full-path to the executable corresponding to the C++ compiler to use. CMake platform-dependent
CXX Idem Environment Idem
BUILD_SHARED_LIBS Whether to build shared or static libraries. CMake TRUE

## Variables Used Only When Building Programs (Such as Demos or Examples)

Variable Description Type Default Value
CGAL_DIR Full-path to the binary directory where CGAL was configured Either CMake or Environment none
Qt5_DIR Full-path to the Qt cmake directory CMakeplatform-dependent

## Variables Providing Information About 3rd-Party Libraries

The following variables provide information about the availability and location of the 3rd party libraries used by CGAL. CMake automatically searches for dependencies so you need to specify these variables if CMake was unable to locate something. This is indicated by a value ending in NOTFOUND.

Since 3rd-party libraries are system wide, many of the CMake variables listed below can alternatively be given as similarly-named environment variables instead. Keep in mind that you must provide one or the other but never both.

## Boost Libraries

In most cases, if Boost is not automatically found, setting the BOOST_ROOT variable is enough. If it is not, you can specify the header and library directories individually. You can also provide the full pathname to a specific compiled library if it cannot be found in the library directory or its name is non-standard.

By default, when Boost binary libraries are needed, the shared versions are used if present. You can set the variable CGAL_Boost_USE_STATIC_LIBS to ON if you want to link with static versions explicitly.

On Windows, if you link with Boost shared libraries, you must ensure that the .dll files are found by the dynamic linker, at run time. For example, you can add the path to the Boost .dll to the PATH environment variable.

Variable Description Type
BOOST_ROOTThe environment variable can be spelled either BOOST_ROOT or BOOSTROOT Root directory of your Boost installation Either CMake or Environment
Boost_INCLUDE_DIR Directory containing the boost/version.hpp file CMake
BOOST_INCLUDEDIR Idem Environment
Boost_LIBRARY_DIRS Directory containing the compiled Boost libraries CMake
BOOST_LIBRARYDIR Idem Environment
Boost_(xyz)_LIBRARY_RELEASE Full pathname to a release build of the compiled 'xyz' Boost library CMake
Boost_(xyz)_LIBRARY_DEBUG Full pathname to a debug build of the compiled 'xyz' Boost library CMake

## GMP and MPFR Libraries

Under Windows, auto-linking is used, so only the directory containing the libraries is needed and you would specify GMP|MPFR_LIBRARY_DIR rather than GMP|MPFR_LIBRARIES. On the other hand, under Linux the actual library filename is needed. Thus you would specify GMP|MPFR_LIBRARIES. In no case you need to specify both.

CGAL uses both GMP and MPFR so both need to be supported. If either of them is unavailable the usage of GMP and of MPFR will be disabled.

Variable Description Type
CGAL_DISABLE_GMP Indicates whether to search and use GMP/MPFR or not CMake
GMP_DIR Directory of GMP default installation Environment
GMP_INCLUDE_DIR Directory containing the gmp.h file CMake
GMP_INC_DIR Idem Environment
GMP_LIBRARIES_DIR Directory containing the compiled GMP library CMake
GMP_LIB_DIR Idem Environment
GMP_LIBRARIES Full pathname of the compiled GMP library CMake
MPFR_INCLUDE_DIR Directory containing the mpfr.h file CMake
MPFR_INC_DIR Idem Environment
MPFR_LIBRARIES_DIR Directory containing the compiled MPFR library CMake
MPFR_LIB_DIR Idem Environment
MPFR_LIBRARIES Full pathname of the compiled MPFR library CMake

Under Linux, the GMPXX is also searched for, and you may specify the following variables:

Variable Description Type
GMPXX_DIR Directory of GMPXX default installation Environment
GMPXX_INCLUDE_DIR Directory containing the gmpxx.h file CMake
GMPXX_LIBRARIES Full pathname of the compiled GMPXX library CMake

## Qt5 Library

You must set the cmake or environment variable Qt5_DIR to point to the path to the directory containing the file Qt5Config.cmake created by your Qt5 installation. If you are using the open source edition it should be <path>/qt-everywhere-opensource-src-<version>/qtbase/lib/cmake/Qt5.

## LEDA Library

When the LEDA libraries are not automatically found, yet they are installed on the system with base names 'leda' and 'ledaD' (for the release and debug versions resp.), it might be sufficient to just indicate the library directory via the LEDA_LIBRARY_DIRS variable. If that doesn't work because, for example, the names are different, you can provide the full pathnames of each variant via LEDA_LIBRARY_RELEASE and LEDA_LIBRARY_DEBUG.

The variables specifying definitions and flags can be left undefined if they are not needed by LEDA.

Variable Description Type
WITH_LEDA Indicates whether to search and use LEDA or not CMake
LEDA_DIR Directory of LEDA default installation Environment
LEDA_INCLUDE_DIR Directory containing the file LEDA/system/basic.h CMake
LEDA_LIBRARIES Directory containing the compiled LEDA libraries CMake
LEDA_INC_DIR Directory containing the file LEDA/system/basic.h Environment
LEDA_LIB_DIR Directory containing the compiled LEDA libraries Environment
LEDA_LIBRARY_RELEASE Full pathname to a release build of the LEDA library CMake
LEDA_LIBRARY_DEBUG Full pathname to a debug build of the LEDA library CMake
LEDA_DEFINITIONS Preprocessor definitions CMake
LEDA_CXX_FLAGS Compiler flags CMake
LEDA_LINKER_FLAGS Linker flags CMake

## MPFI Library

CGAL provides a number type based on this library, but the CGAL library itself does not depend on MPFI. This means that this library must be configured when compiling an application that uses the above number type.

When MPFI files are not on the standard path, the locations of the headers and library files must be specified by using environment variables.

Variable Description Type
MPFI_DIR Directory of MPFI default installation Environment
MPFI_INCLUDE_DIR Directory containing the mpfi.h file CMake
MPFI_INC_DIR Idem Environment
MPFI_LIBRARIES_DIR Directory containing the compiled MPFI library CMake
MPFI_LIB_DIR Idem Environment
MPFI_LIBRARIES Full pathname of the compiled MPFI library CMake

## RS and RS3 Library

As said before, only the CGAL univariate algebraic kernel depends on the library Rs. As the algebraic kernel is not compiled as a part of the CGAL library, this library is not detected nor configured at installation time.

CMake will try to find Rs in the standard header and library directories. When it is not automatically detected, the locations of the headers and library files must be specified using environment variables.

Rs needs GMP 4.2 or later and MPFI 1.3.4 or later. The variables related to the latter library may also need to be defined.

Variable Description Type
RS_DIR Directory of RS default installation Environment
RS_INCLUDE_DIR Directory containing the rs_exports.h file CMake
RS_INC_DIR Idem Environment
RS_LIBRARIES_DIR Directory containing the compiled RS library CMake
RS_LIB_DIR Idem Environment
RS_LIBRARIES Full pathname of the compiled RS library CMake

Similar variables exist for RS3.

Variable Description Type
RS3_DIR Directory of RS3 default installation Environment
RS3_INCLUDE_DIR Directory containing the file rs3_fncts.h file CMake
RS3_INC_DIR Idem Environment
RS3_LIBRARIES_DIR Directory containing the compiled RS3 library CMake
RS3_LIB_DIR Idem Environment
RS3_LIBRARIES Full pathname of the compiled RS3 library CMake

## NTL Library

Some polynomial computations in CGAL's algebraic kernel are speed up when NTL is available. As the algebraic kernel is not compiled as a part of the CGAL library, this library is not detected nor configured at installation time.

CMake will try to find NTL in the standard header and library directories. When it is not automatically detected, the locations of the headers and library files must be specified using environment variables.

Variable Description Type
NTL_DIR Directory of NTL default installation Environment
NTL_INCLUDE_DIR Directory containing the NTL/ZZX.h file CMake
NTL_INC_DIR Idem Environment
NTL_LIBRARIES_DIR Directory containing the compiled NTL library CMake
NTL_LIB_DIR Idem Environment
NTL_LIBRARIES Full pathname of the compiled NTL library CMake

## Eigen Library

Eigen is a header-only template library. Only the directory containing the header files of Eigen 3.1 (or greater) is needed.

Variable Description Type
EIGEN3_INCLUDE_DIR Directory containing the file signature_of_eigen3_matrix_library CMake
EIGEN3_INC_DIR Idem Environment

## ESBTL Library

One skin surface example requires the ESBTL library in order to read PDB files.

If ESBTL is not automatically found, setting the ESBTL_INC_DIR environment variable is sufficient.

Variable Description Type
ESBTL_DIR Directory of ESBTL default installation Environment
ESBTL_INC_DIR Directory containing the ESBTL/default.h file Environment
ESBTL_INCLUDE_DIR Directory containing the ESBTL/default.h file CMake

## METIS Library

Some BGL examples require the METIS library in order to partition METIS meshes.

If METIS is not automatically found, setting the METIS_INCLUDE_DIR and METIS_LIBRARY cmake variables is necessary.

Variable Description Type
METIS_INCLUDE_DIR Directory of METIS default installation CMAKE
METIS_LIBRARY Directory containing the libmetis.so or .lib file CMAKE

## TBB Library

If TBB is not automatically found, the user must set the TBB_ROOT environment variable. The environment variable TBB_ARCH_PLATFORM=<arch>/<compiler> must be set. <arch> is ia32 or intel64. <compiler> describes the Linux kernel, gcc version or Visual Studio version used. It should be set to what is used in \$TBB_ROOT/lib/<arch>.

For windows users, the folder TBB_ROOT/bin/<arch>/<compiler> should be added to the PATH variable.

Note that the variables in the table below are being used.

Variable Description Type
TBB_ROOT Directory of TBB default installation Environment
TBB_INCLUDE_DIRS Directory containing the tbb/tbb.h file CMake
TBB_LIBRARY_DIRS Directory(ies) containing the compiled TBB libraries CMake
TBB_LIBRARIES Full pathnames of the compiled TBB libraries (both release and debug versions, using "optimized" and "debug" CMake keywords). Note that if the debug versions are not found, the release versions will be used instead for the debug mode. CMake
TBB_RELEASE_LIBRARY Full pathname of the compiled TBB release library CMake
TBB_MALLOC_RELEASE_LIBRARY Full pathname of the compiled TBB release malloc library CMake
TBB_DEBUG_LIBRARY Full pathname of the compiled TBB debug library CMake
TBB_MALLOC_DEBUG_LIBRARY Full pathname of the compiled TBB debug malloc library CMake
TBB_MALLOCPROXY_DEBUG_LIBRARY Full pathname of the compiled TBB debug malloc_proxy library (optional) CMake
TBB_MALLOCPROXY_RELEASE_LIBRARY Full pathname of the compiled TBB release malloc_proxy library (optional) CMake

## LASlib library

If LASLIB is not automatically found, the following variables must be set:

Variable Description Type
LASLIB_INCLUDE_DIR Directory containing the file lasreader.hpp CMake
LASZIP_INCLUDE_DIR Directory containing the file mydefs.hpp CMake
LASLIB_LIBRARIES Full pathname of the compiled LASLIB library CMake

## OpenCV library

The environment variable OPENCV_DIR should be set to the directory containing the file OpenCVConfig.cmake provided by OpenCV.

## SCIP library

The environment variable SCIP_DIR should be set to the directory containing the file scip-config.cmake provided by SCIP.

## GLPK library

If GLPK is not automatically found, the following variables must be set:

Variable Description Type
GLPK_INCLUDE_DIR Directory containing the file glpk.h CMake
GLPK_LIBRARIES Full pathname of the compiled GLPK library CMake

# Compiler Workarounds

A number of boolean flags are used to workaround compiler bugs and limitations. They all start with the prefix CGAL_CFG. These flags are used to work around compiler bugs and limitations. For example, the flag CGAL_CFG_NO_CPP0X_LONG_LONG denotes that the compiler does not know the type long long.

For each installation a file <CGAL/compiler_config.h> is defined, with the correct settings of all flags. This file is generated automatically by CMake, and it is located in the include directory of where you run CMake. For an in-source configuration this means CGAL-5.3/include.

The test programs used to generate the compiler_config.h file can be found in config/testfiles. Both compiler_config.h and the test programs contain a short description of the problem. In case of trouble with one of the CGAL_CFG flags, it is a good idea to take a look at it.

The file CGAL/compiler_config.h is included from <CGAL/config.h>. which is included by all CGAL header files.