diff -up ilmbase-1.0.3/IexMath/IexMathFpu.cpp.secondary ilmbase-1.0.3/IexMath/IexMathFpu.cpp

--- ilmbase-1.0.3/IexMath/IexMathFpu.cpp.secondary	2012-09-04 10:26:55.000000000 +0200

+++ ilmbase-1.0.3/IexMath/IexMathFpu.cpp	2012-09-04 10:27:20.000000000 +0200

@@ -27,7 +27,7 @@

 #endif

-#ifdef HAVE_UCONTEXT_H

+#if defined(HAVE_UCONTEXT_H) && (defined(__x86_64__) || defined(__i386__))

 #include <ucontext.h>