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diff -Naruw geos-3.4.1.orig/include/geos/platform.h.in geos-3.4.1/include/geos/platform.h.in
--- geos-3.4.1.orig/include/geos/platform.h.in 2013-08-17 14:08:04.000000000 +0000
+++ geos-3.4.1/include/geos/platform.h.in 2013-08-18 22:00:59.412676805 +0000
@@ -96,8 +96,9 @@
// It does leave a version in std.
# define ISNAN(x) (std::isnan(x))
# elif defined(__sun) || defined(__sun__)
+# define _XOPEN_SOURCE 600 // force iso/math_c99
# include <math.h>
-# define ISNAN(x) (::isnan(x))
+# define ISNAN(x) (std::isnan(x))
# endif
#endif
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