--- demo/CMakeLists.txt.orig	2015-02-20 13:46:16 UTC
+++ demo/CMakeLists.txt
@@ -27,6 +27,10 @@ if(NOT MSVC)
   list(APPEND chipmunk_demos_libraries m)
 endif(NOT MSVC)
 
+if(NOT APPLE AND FORCE_CLANG_BLOCKS)
+  list(APPEND chipmunk_demos_libraries BlocksRuntime)
+endif(NOT APPLE AND FORCE_CLANG_BLOCKS)
+
 file(GLOB chipmunk_demos_source_files "*.c")
 
 include_directories(${chipmunk_demos_include_dirs})
