cmake: dont hardcode install paths

CMakeLists.txt

@@ -7,6 +7,9 @@ CMAKE_MINIMUM_REQUIRED(VERSION 2.8 FATAL_ERROR)
 
 PROJECT(libcue)
 
+include(GNUInstallDirs)
+
+
 SET(PACKAGE_STRING "${PACKAGE_NAME} ${PACKAGE_VERSION}")
 ADD_DEFINITIONS(-DPACKAGE_VERSION="${PACKAGE_VERSION}")
 ADD_DEFINITIONS(-DPACKAGE_STRING="${PACKAGE_STRING}")
@@ -19,7 +22,7 @@ SET (CUE_SOURCES
 
 CONFIGURE_FILE(libcue.pc.in libcue.pc @ONLY)
 INSTALL(FILES ${CMAKE_BINARY_DIR}/libcue.pc
-	DESTINATION ${CMAKE_INSTALL_PREFIX}/lib/pkgconfig)
+	DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig)
 
 INCLUDE_DIRECTORIES(${CMAKE_SOURCE_DIR})
 INCLUDE_DIRECTORIES(${CMAKE_BINARY_DIR}) # for generated files
@@ -44,14 +47,14 @@ SET_TARGET_PROPERTIES (cue
 	C_VISIBILITY_PRESET hidden)
 
 INSTALL(TARGETS cue
-	LIBRARY DESTINATION lib
-	ARCHIVE DESTINATION lib)
-INSTALL(FILES ${CMAKE_SOURCE_DIR}/libcue.h DESTINATION include)
+	LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+	ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
+INSTALL(FILES ${CMAKE_SOURCE_DIR}/libcue.h DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
 if(CMAKE_HOST_UNIX)
-	INSTALL(DIRECTORY DESTINATION include/libcue)
+	INSTALL(DIRECTORY DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/libcue)
 	INSTALL(CODE "
 	EXECUTE_PROCESS(COMMAND ${CMAKE_COMMAND} -E create_symlink ../libcue.h
-		\$ENV{DESTDIR}/${CMAKE_INSTALL_PREFIX}/include/libcue/libcue.h)
+		\$ENV{DESTDIR}/${CMAKE_INSTALL_FULL_INCLUDEDIR}/libcue/libcue.h)
 	")
 endif(CMAKE_HOST_UNIX)