$NetBSD: patch-CMakeLists.txt,v 1.3 2014/03/13 13:25:49 adam Exp $

Allow in-tree build.
Handle .dylib extension on Darwin.

--- CMakeLists.txt.orig	2014-03-08 04:36:49.000000000 +0000
+++ CMakeLists.txt
@@ -1,6 +1,3 @@
-if(${CMAKE_SOURCE_DIR} STREQUAL ${CMAKE_BINARY_DIR})
-  message(FATAL_ERROR "Prevented in-tree built. Please create a build directory outside of the SDL source code and call cmake from there")
-endif()
 
 cmake_minimum_required(VERSION 2.6)
 project(SDL2 C)
@@ -1283,10 +1280,15 @@ install(FILES ${INCLUDE_FILES} DESTINATI
 
 if(NOT WINDOWS OR CYGWIN)
   if(SDL_SHARED)
+    if(APPLE)
+      set(SO_EXT "dylib")
+    else(APPLE)
+      set(SO_EXT "so")
+    endif(APPLE)
     install(CODE "
       execute_process(COMMAND ${CMAKE_COMMAND} -E create_symlink
-      \"libSDL2-2.0.so\" \"libSDL2.so\")")
-    install(FILES ${SDL2_BINARY_DIR}/libSDL2.so DESTINATION "lib${LIB_SUFFIX}")
+      \"libSDL2-2.0.${SO_EXT}\" \"libSDL2.${SO_EXT}\")")
+    install(FILES ${SDL2_BINARY_DIR}/libSDL2.${SO_EXT} DESTINATION "lib${LIB_SUFFIX}")
   endif()
   if(FREEBSD)
     # FreeBSD uses ${PREFIX}/libdata/pkgconfig