$NetBSD: patch-ab,v 1.6 2007/02/19 22:41:32 joerg Exp $

--- src/display/nr-filter-gaussian.cpp.orig	2007-02-19 22:21:03.000000000 +0000
+++ src/display/nr-filter-gaussian.cpp
@@ -16,7 +16,9 @@
 #include <cmath>
 #include <glib.h>
 
+#if (!defined(__NetBSD__) || defined(_GLIBCXX_USE_C99_MATH)) && !defined(isnormal)
 using std::isnormal;
+#endif
 
 #include "display/nr-filter-primitive.h"
 #include "display/nr-filter-gaussian.h"
