--- ilmbase-1.0.1/IlmThread/Makefile.am.orig	2006-12-08 22:59:36.000000000 +0100
+++ ilmbase-1.0.1/IlmThread/Makefile.am	2008-01-13 13:02:47.060607251 +0100
@@ -11,7 +11,7 @@
 			  IlmThreadMutexPosix.cpp
 
 libIlmThread_la_LDFLAGS = -version-info @LIBTOOL_VERSION@ -no-undefined
-libIlmThread_la_LIBADD = ../Iex/libIex.la
+libIlmThread_la_LIBADD = ../Iex/libIex.la -lpthread
 
 libIlmThreadincludedir = $(includedir)/OpenEXR