Index: src/libcfa/stdhdr/math.h
===================================================================
--- src/libcfa/stdhdr/math.h	(revision 381fdee5d28e58b7c6f73f40e6d72ec1f6dfc7d1)
+++ src/libcfa/stdhdr/math.h	(revision 507e7a25c43d01f94faa1f5f24b309ae36bd70d6)
@@ -10,10 +10,20 @@
 // Created On       : Mon Jul  4 23:25:26 2016
 // Last Modified By : Peter A. Buhr
-// Last Modified On : Tue Jul  5 20:38:18 2016
-// Update Count     : 12
+// Last Modified On : Thu Feb 22 18:16:07 2018
+// Update Count     : 13
 // 
 
 extern "C" {
+#if ! defined( exception )								// nesting ?
+#define exception `exception`							// make keyword an identifier
+#define __CFA_MATH_H__
+#endif
+
 #include_next <math.h>									// has internal check for multiple expansion
+
+#if defined( exception ) && defined( __CFA_MATH_H__ )	// reset only if set
+#undef exception
+#undef __CFA_MATH_H__
+#endif
 } // extern "C"