--- gsoap-2.8/gsoap/stdsoap2.h	2019-04-18 22:09:34.000000000 +0000
+++ gsoap-2.8/gsoap/stdsoap2.h.new	2019-04-24 22:58:49.520176598 +0000
@@ -1395,7 +1395,9 @@ extern "C" {
 #endif
 
 #ifdef SUN_OS
-# define HAVE_ISNAN
+# ifndef HAVE_ISNAN
+#  define HAVE_ISNAN
+# endif
 #endif
 
 #ifdef __APPLE__