fixes #12935

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@66956 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/utilscmn.cpp

@@ -580,6 +580,10 @@ bool wxGetEnvMap(wxEnvVariableHashMap *map)
 #else // non-MSVC non-Mac
     // Not sure if other compilers have _tenviron so use the (more standard)
     // ANSI version only for them.
+#ifdef __BSD__
+    // POSIX, but not in an include file
+    extern char **environ;
+#endif
     char **env = environ;
 #endif