diff -r 7ac321f6e0e4 cmake/sdlchecks.cmake
--- a/cmake/sdlchecks.cmake	Tue Apr 16 01:05:32 2013 -0400
+++ b/cmake/sdlchecks.cmake	Tue Apr 16 00:16:47 2013 -0700
@@ -587,7 +587,8 @@
     endif(LINUX)
 
     # Run some tests
-    set(CMAKE_REQUIRED_FLAGS "${PTHREAD_CFLAGS} ${PTHREAD_LDFLAGS}")
+    set(CMAKE_REQUIRED_FLAGS "${PTHREAD_CFLAGS}")
+    set(CMAKE_REQUIRED_LIBRARIES "${PTHREAD_LDFLAGS}")
     check_c_source_runs("
         #include <pthread.h>
         int main(int argc, char** argv) {
@@ -624,7 +625,8 @@
 
       if(PTHREADS_SEM)
         check_c_source_compiles("#include <pthread.h>
-                                 #include <semaphore.h>" HAVE_PTHREADS_SEM)
+                                 #include <semaphore.h>
+                                 int main (int argc, char **argv) { return 0; }" HAVE_PTHREADS_SEM)
         if(HAVE_PTHREADS_SEM)
           check_c_source_compiles("
               #include <pthread.h>