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GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it

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# - Try to find the GMP libraries
# This module defines:
#  GMP_FOUND             - system has GMP lib
#  GMP_INCLUDE_DIR       - the GMP include directory
#  GMP_LIBRARIES_DIR     - directory where the GMP libraries are located
#  GMP_LIBRARIES         - Link these to use GMP
#  GMP_IN_CGAL_AUXILIARY - TRUE if the GMP found is the one distributed with CGAL in the auxiliary folder

# TODO: support MacOSX

include(FindPackageHandleStandardArgs)
#include(CGAL_GeneratorSpecificSettings)

if(GMP_INCLUDE_DIR)
  set(GMP_in_cache TRUE)
else()
  set(GMP_in_cache FALSE)
endif()
if(NOT GMP_LIBRARIES)
  set(GMP_in_cache FALSE)
endif()

# Is it already configured?
if (GMP_in_cache)

  set(GMP_FOUND TRUE)

else()

  find_path(GMP_INCLUDE_DIR
            NAMES gmp.h
            HINTS ENV GMP_INC_DIR
                  ENV GMP_DIR
#                  ${CGAL_INSTALLATION_PACKAGE_DIR}/auxiliary/gmp/include
            PATH_SUFFIXES include
  	        DOC "The directory containing the GMP header files"
           )

  if ( GMP_INCLUDE_DIR STREQUAL "${CGAL_INSTALLATION_PACKAGE_DIR}/auxiliary/gmp/include" )
    cache_set( GMP_IN_CGAL_AUXILIARY TRUE )
  endif()

  find_library(GMP_LIBRARIES NAMES gmp libgmp-10
    HINTS ENV GMP_LIB_DIR
          ENV GMP_DIR
#          ${CGAL_INSTALLATION_PACKAGE_DIR}/auxiliary/gmp/lib
    PATH_SUFFIXES lib
    DOC "Path to the GMP library"
    )
  find_library(GMP_STATIC_LIBRARIES NAMES libgmp.a
    HINTS ENV GMP_LIB_DIR
          ENV GMP_DIR
    PATH_SUFFIXES lib
    DOC "Path to the static GMP library"
    )

  if ( GMP_LIBRARIES )
    get_filename_component(GMP_LIBRARIES_DIR ${GMP_LIBRARIES} PATH CACHE )
  endif()

  # Attempt to load a user-defined configuration for GMP if couldn't be found
  if ( NOT GMP_INCLUDE_DIR OR NOT GMP_LIBRARIES_DIR )
    include( GMPConfig OPTIONAL )
  endif()

  find_package_handle_standard_args(GMP "DEFAULT_MSG" GMP_LIBRARIES GMP_INCLUDE_DIR)

endif()