dumb workaround for old cmake that can't set include_directories per

target

CMakeLists.txt

@@ -17,15 +17,33 @@ include_directories(${DB_VK_SOURCE_DIR})
 
 set(CMAKE_C_FLAGS "-g -Wall")
 
+
+# Older versions of cmake does not support modifying INCLUDE_DIRECTORIES for a target
+# by means of SET_TARGET_PROPERTIES command
+if (CMAKE_MAJOR_VERSION EQUAL "2" 
+		AND (CMAKE_MINOR_VERSION LESS "8" OR CMAKE_MINOR_VERSION EQUAL "8")
+		AND CMAKE_PATCH_VERSION LESS "10")
+	set(CMAKE_PRIOR_TO_2_8_10 "ON")
+endif()
+# With this old version we can't build two versions at the same time :(
+if (CMAKE_PRIOR_TO_2_8_10 AND WITH_GTK2 AND WITH_GTK3)
+	message(FATAL_ERROR "Cannot build both GTK2 & GTK3 libs at once on cmake ${CMAKE_VERSION}. Build with either version of GTK separately (e.g. -DWITH_GTK2=ON -DWITH_GTK3=OFF) or upgrade cmake to at least 2.8.10")
+endif()
+
+
 if (WITH_GTK2)
 	pkg_check_modules(GTK2 REQUIRED gtk+-2.0)
 	add_library(vkontakte_gtk2 SHARED vkontakte.c vk-api.c ui.c util.c)
 	target_link_libraries(vkontakte_gtk2 ${GTK2_LIBRARIES} ${CURL_LIBRARIES} ${JSON_GLIB_LIBRARIES})
 
-	get_target_property(VK_GTK2_INCLUDE_DIRS vkontakte_gtk2 INCLUDE_DIRECTORIES)
-	set_target_properties(vkontakte_gtk2 PROPERTIES INCLUDE_DIRECTORIES "${VK_GTK2_INCLUDE_DIRS};${GTK2_INCLUDE_DIRS}")
+	if (CMAKE_PRIOR_TO_2_8_10)
+		include_directories(${GTK2_INCLUDE_DIRS})
+	else()
+		get_target_property(VK_GTK2_INCLUDE_DIRS vkontakte_gtk2 INCLUDE_DIRECTORIES)
+		set_target_properties(vkontakte_gtk2 PROPERTIES INCLUDE_DIRECTORIES "${VK_GTK2_INCLUDE_DIRS};${GTK2_INCLUDE_DIRS}")
+	endif()
 
-        link_directories(${GTK2_LIBRARY_DIRS})
+    link_directories(${GTK2_LIBRARY_DIRS})
 
 	set_target_properties(vkontakte_gtk2 PROPERTIES PREFIX "")
 	install(TARGETS vkontakte_gtk2 DESTINATION "lib${LIB_SUFFIX}/deadbeef")
@@ -36,8 +54,12 @@ if (WITH_GTK3)
 	add_library(vkontakte_gtk3 SHARED vkontakte.c vk-api.c ui.c util.c)
 	target_link_libraries(vkontakte_gtk3 ${GTK3_LIBRARIES} ${CURL_LIBRARIES} ${JSON_GLIB_LIBRARIES})
 
-        get_target_property(VK_GTK3_INCLUDE_DIRS vkontakte_gtk3 INCLUDE_DIRECTORIES)
-	set_target_properties(vkontakte_gtk3 PROPERTIES INCLUDE_DIRECTORIES "${VK_GTK3_INCLUDE_DIRS};${GTK3_INCLUDE_DIRS}") 
+    if (CMAKE_PRIOR_TO_2_8_10)
+		include_directories(${GTK3_INCLUDE_DIRS})
+	else()
+	    get_target_property(VK_GTK3_INCLUDE_DIRS vkontakte_gtk3 INCLUDE_DIRECTORIES)
+		set_target_properties(vkontakte_gtk3 PROPERTIES INCLUDE_DIRECTORIES "${VK_GTK3_INCLUDE_DIRS};${GTK3_INCLUDE_DIRS}")
+	endif() 
 
 	link_directories(${GTK2_LIBRARY_DIRS})