Install pkg-config file

CMakeLists.txt

@@ -43,6 +43,8 @@ ELSE(MSVC)
 	SET(WERROR_FLAG "-Werror")
 ENDIF(MSVC)
 
+LIST(REMOVE_DUPLICATES SDL2_ALL_INCLUDE_DIRS)
+
 INCLUDE_DIRECTORIES(BEFORE ${PROJECT_SOURCE_DIR})
 INCLUDE_DIRECTORIES(${SDL2_ALL_INCLUDE_DIRS})
 
@@ -107,8 +109,27 @@ IF(CMAKE_SOURCE_DIR STREQUAL PROJECT_SOURCE_DIR)
 	ADD_SUBDIRECTORY(demos)
 	ADD_SUBDIRECTORY(tests)
 
+	# pkgconfig
+	SET(PKGCONFIGDIR lib/pkgconfig CACHE STRING "directory where to install pkg-config files")
+	IF(CMAKE_SYSTEM_NAME MATCHES "FreeBSD")
+		SET(PKGCONFIGDIR libdata/pkgconfig)
+	ENDIF(CMAKE_SYSTEM_NAME MATCHES "FreeBSD")
+
+	SET(SDL2_PKGCONFIG_CFLAGS "")
+	FOREACH(INCDIR IN LISTS SDL2_ALL_INCLUDE_DIRS)
+		SET(SDL2_PKGCONFIG_CFLAGS "${SDL2_PKGCONFIG_CFLAGS} -I${INCDIR}")
+	ENDFOREACH(INCDIR IN SDL2_ALL_INCLUDE_DIRS)
+
+	CONFIGURE_FILE(
+		sdl2pp.pc.in
+		sdl2pp.pc
+		@ONLY
+	)
+
+	# install
 	INSTALL(FILES ${LIBRARY_HEADERS} ${PROJECT_BINARY_DIR}/SDL2pp/Config.hh DESTINATION include/SDL2pp)
 	INSTALL(TARGETS SDL2pp LIBRARY DESTINATION lib)
+	INSTALL(FILES ${PROJECT_BINARY_DIR}/sdl2pp.pc DESTINATION ${PKGCONFIGDIR})
 ELSE(CMAKE_SOURCE_DIR STREQUAL PROJECT_SOURCE_DIR)
 	MESSAGE(STATUS "libSDL2pp bundled build")
 

sdl2pp.pc.in

@@ -0,0 +1,14 @@
+# libSDL2pp pkg-config source file
+
+prefix=@CMAKE_INSTALL_PREFIX@
+exec_prefix=${prefix}
+libdir=${exec_prefix}/lib
+includedir=${prefix}/include
+
+Name: sdl2pp
+Description: C++11 bindings/wrappers for SDL2.
+Version: @SDL2PP_VERSION@
+Requires:
+Conflicts:
+Libs: -L${libdir} -lSDL2pp
+Cflags: -I${includedir}@SDL2_PKGCONFIG_CFLAGS@