--- ilmbase-2.0.0.orig/IexMath/IexMathFpu.cpp	2013-03-06 18:18:50.000000000 -0500
+++ ilmbase-2.0.0/IexMath/IexMathFpu.cpp	2013-04-23 13:17:40.273193358 -0500
@@ -53,8 +53,7 @@
 #endif
 
 
-#ifdef HAVE_UCONTEXT_H
-
+#if defined(HAVE_UCONTEXT_H) && (defined(x86_64) || defined(i386_))
 
 #include <ucontext.h>
 #include <signal.h>