Merge pull request #341 from akien-mga/fix-pkgconfig

pkgconfig: Fix support for absolute lib and include dirs

CMakeLists.txt

@@ -279,22 +279,31 @@ endif()
 # .so version
 set_property(TARGET lcf PROPERTY SOVERSION 0)
 
+# installation
+include(GNUInstallDirs)
+
 # pkg-config file generation
+set(LCF_LIBDIR ${CMAKE_INSTALL_LIBDIR})
+if(IS_ABSOLUTE ${LCF_LIBDIR})
+	file(RELATIVE_PATH LCF_LIBDIR ${CMAKE_INSTALL_PREFIX} ${LCF_LIBDIR})
+endif()
+set(LCF_INCLUDEDIR ${CMAKE_INSTALL_INCLUDEDIR})
+if(IS_ABSOLUTE ${LCF_INCLUDEDIR})
+	file(RELATIVE_PATH LCF_INCLUDEDIR ${CMAKE_INSTALL_PREFIX} ${LCF_INCLUDEDIR})
+endif()
+
 set(PACKAGE_TARNAME ${PROJECT_NAME})
 set(PACKAGE_VERSION ${PROJECT_VERSION})
 set(prefix "${CMAKE_INSTALL_PREFIX}")
 set(exec_prefix "\${prefix}")
-set(libdir "\${exec_prefix}/${CMAKE_INSTALL_LIBDIR}")
-set(includedir "\${prefix}/${CMAKE_INSTALL_INCLUDEDIR}")
+set(libdir "\${exec_prefix}/${LCF_LIBDIR}")
+set(includedir "\${prefix}/${LCF_INCLUDEDIR}")
 string(REPLACE ";" " " AX_PACKAGE_REQUIRES_PRIVATE "${LIBLCF_DEPS}")
 configure_file(builds/${PROJECT_NAME}.pc.in builds/${PROJECT_NAME}.pc @ONLY)
 
 # Cmake-config file generation
 configure_file(builds/${PROJECT_NAME}-config.cmake.in builds/${PROJECT_NAME}-config.cmake @ONLY)
 
-# installation
-include(GNUInstallDirs)
-
 install(
 	TARGETS lcf
 	ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}