diff -up ilmbase-2.2.0/IlmThread/Makefile.am.no_undefined ilmbase-2.2.0/IlmThread/Makefile.am
--- ilmbase-2.2.0/IlmThread/Makefile.am.no_undefined 2014-08-09 21:03:38.000000000 -0500
+++ ilmbase-2.2.0/IlmThread/Makefile.am 2014-11-20 07:44:27.913588030 -0600
@@ -14,7 +14,7 @@ libIlmThread_la_LDFLAGS = -version-info
if LIB_SUFFIX_EXISTS
libIlmThread_la_LDFLAGS += -release @LIB_SUFFIX@
endif
-libIlmThread_la_LIBADD = ../Iex/libIex.la
+libIlmThread_la_LIBADD = ../Iex/libIex.la $(PTHREAD_LIBS)
libIlmThreadincludedir = $(includedir)/OpenEXR
diff -up ilmbase-2.2.0/IlmThread/Makefile.in.no_undefined ilmbase-2.2.0/IlmThread/Makefile.in
--- ilmbase-2.2.0/IlmThread/Makefile.in.no_undefined 2014-08-09 23:37:24.000000000 -0500
+++ ilmbase-2.2.0/IlmThread/Makefile.in 2014-11-20 07:44:27.914587968 -0600
@@ -251,7 +251,7 @@ libIlmThread_la_SOURCES = IlmThreadPool.
libIlmThread_la_LDFLAGS = -version-info @LIBTOOL_VERSION@ \
-no-undefined $(am__append_1)
-libIlmThread_la_LIBADD = ../Iex/libIex.la
+libIlmThread_la_LIBADD = ../Iex/libIex.la $(PTHREAD_LIBS)
libIlmThreadincludedir = $(includedir)/OpenEXR
libIlmThreadinclude_HEADERS = IlmThreadPool.h IlmThread.h \
IlmThreadSemaphore.h IlmThreadMutex.h \