$OpenBSD: patch-CMakeLists_txt,v 1.1 2012/10/30 23:51:21 brad Exp $
--- CMakeLists.txt.orig	Tue Oct 23 18:40:45 2012
+++ CMakeLists.txt	Tue Oct 23 18:41:39 2012
@@ -170,6 +170,11 @@ IF(UNIX)
         IF(HAVE_PTHREAD_H)
             SET(PHYSFS_HAVE_THREAD_SUPPORT TRUE)
         ENDIF(HAVE_PTHREAD_H)
+
+        FIND_LIBRARY(PTHREAD_LIBRARY pthread)
+        IF(PTHREAD_LIBRARY)
+            SET(OPTIONAL_LIBRARY_LIBS ${OPTIONAL_LIBRARY_LIBS} ${PTHREAD_LIBRARY})
+        ENDIF(PTHREAD_LIBRARY)
     ENDIF(BEOS)
 ENDIF(UNIX)
 
