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# - pkg-config module for CMake
#
# Defines the following macros:
#
# PKGCONFIG(package includedir libdir linkflags cflags)
#
# Calling PKGCONFIG will fill the desired information into the 4 given arguments,
# e.g. PKGCONFIG(libart-2.0 LIBART_INCLUDE_DIR LIBART_LINK_DIR LIBART_LINK_FLAGS LIBART_CFLAGS)
# if pkg-config was NOT found or the specified software package doesn't exist, the
# variable will be empty when the function returns, otherwise they will contain the respective information
#
FIND_PROGRAM(PKGCONFIG_EXECUTABLE NAMES pkg-config PATHS /usr/bin /usr/local/bin )
MACRO(PKGCONFIG _package _minVersion _include_DIR _link_DIR _link_FLAGS _cflags)
# reset the variables at the beginning
SET(${_include_DIR})
SET(${_link_DIR})
SET(${_link_FLAGS})
SET(${_cflags})
# if pkg-config has been found
IF(PKGCONFIG_EXECUTABLE)
EXEC_PROGRAM(${PKGCONFIG_EXECUTABLE} ARGS ${_package} --atleast-version=${_minVersion} RETURN_VALUE _return_VALUE OUTPUT_VARIABLE _pkgconfigDevNull )
# EXEC_PROGRAM(${PKGCONFIG_EXECUTABLE} ARGS ${_package} --exists RETURN_VALUE _return_VALUE OUTPUT_VARIABLE _pkgconfigDevNull )
# and if the package of interest also exists for pkg-config, then get the information
IF(NOT _return_VALUE)
EXEC_PROGRAM(${PKGCONFIG_EXECUTABLE} ARGS ${_package} --variable=includedir OUTPUT_VARIABLE ${_include_DIR} )
EXEC_PROGRAM(${PKGCONFIG_EXECUTABLE} ARGS ${_package} --variable=libdir OUTPUT_VARIABLE ${_link_DIR} )
EXEC_PROGRAM(${PKGCONFIG_EXECUTABLE} ARGS ${_package} --libs OUTPUT_VARIABLE ${_link_FLAGS} )
EXEC_PROGRAM(${PKGCONFIG_EXECUTABLE} ARGS ${_package} --cflags OUTPUT_VARIABLE ${_cflags} )
ENDIF(NOT _return_VALUE)
ENDIF(PKGCONFIG_EXECUTABLE)
ENDMACRO(PKGCONFIG _include_DIR _link_DIR _link_FLAGS _cflags)
MARK_AS_ADVANCED(PKGCONFIG_EXECUTABLE)
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