--- a/mcproxy/src/utils/mc_socket.cpp
+++ b/mcproxy/src/utils/mc_socket.cpp
@@ -38,6 +38,8 @@
#include <unistd.h>
#ifdef __UCLIBC__
+#define IP_MULTICAST_ALL 49
+
#include "sourcefilter.cpp"
#endif /* __UCLIBC__ */