diff -rbu cmake-2.8.1-orig/Source/kwsys/SystemTools.cxx cmake-2.8.1/Source/kwsys/SystemTools.cxx
--- cmake-2.8.1-orig/Source/kwsys/SystemTools.cxx	2010-04-06 10:45:37.000000000 -0400
+++ cmake-2.8.1/Source/kwsys/SystemTools.cxx	2010-04-21 20:31:59.000000000 -0400
@@ -9,6 +9,13 @@
   implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
   See the License for more information.
 ============================================================================*/
+
+#ifdef __osf__
+#  define _OSF_SOURCE
+#  define _POSIX_C_SOURCE 199506L
+#  define _XOPEN_SOURCE_EXTENDED
+#endif
+
 #include "kwsysPrivate.h"
 #include KWSYS_HEADER(RegularExpression.hxx)
 #include KWSYS_HEADER(SystemTools.hxx)