Fix build on FreeBSD, broken since open_url

diff --git a/src/porting.cpp b/src/porting.cpp
index 29af62f7d6347a18e37c9ad4e707bb8fb73ee23f..d902d3737048d2b49d8025351a9f24c85e34d1b8 100644 (file)
--- a/src/porting.cpp
+++ b/src/porting.cpp
@@ -28,6 +28,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #if defined(__FreeBSD__)  || defined(__NetBSD__) || defined(__DragonFly__)
        #include <sys/types.h>
        #include <sys/sysctl.h>
+       extern char **environ;
 #elif defined(_WIN32)
        #include <windows.h>
        #include <wincrypt.h>