$OpenBSD$
--- CMakeLists.txt.orig	Tue Aug  6 05:57:30 2013
+++ CMakeLists.txt	Sat Aug 10 17:48:28 2013
@@ -32,6 +32,9 @@ endif()
 
 # Platform specific libs
 if(UNIX)
+	find_package(X11 REQUIRED QUIET)
+	include_directories(${X11_INCLUDE_DIR})
+	link_directories(${X11_LIBRARY_DIR})
 	list(APPEND LIBS "X11" "Xcursor")
 endif(UNIX)
 
@@ -64,7 +67,11 @@ endif()
 mark_as_advanced(SHARE_INSTALL)
 #TODO: This would be more elegant and compiler independent to do through configure_file(),
 #      but that would break other build systems for good.
-add_definitions(-DSHARED_DATA_DIR="${SHARE_INSTALL}")
+if(NOT SHARED_DATA_DIR)
+	add_definitions(-DSHARED_DATA_DIR="${SHARE_INSTALL}")
+else()
+	add_definitions(-DSHARED_DATA_DIR="${SHARED_DATA_DIR}")
+endif()
 
 
 if (DEFINED CMAKE_BUILD_TYPE)
@@ -121,7 +128,10 @@ if(BUILD_GAME OR BUILD_EDITOR)
 	endforeach()
 
 	if(UNIX)
-		list(APPEND LIBS "rt")   # For clock_gettime()
+		check_library_exists(rt clock_gettime "" HAVE_LIBRT)
+		if (HAVE_LIBRT)
+			list(APPEND LIBS "rt") # For clock_gettime()
+		endif()
 	endif()
 endif()