Index: ../trunk-jpl/m4/issm_options.m4
===================================================================
--- ../trunk-jpl/m4/issm_options.m4	(revision 18593)
+++ ../trunk-jpl/m4/issm_options.m4	(revision 18594)
@@ -1841,7 +1841,7 @@
 		MULTITHREADINGLIB="-lpthread -lrt"
 		;;
 		*darwin*)
-		MULTITHREADINGLIB="-lpthread"
+		MULTITHREADINGLIB="-L/usr/lib/ -lpthread"
 		;;
 		esac
 		AC_DEFINE([_MULTITHREADING_],[1],[with numthreads enabled])
