ext/libuv/src/unix/pthread-fixes.c in libuv-1.3.0 vs ext/libuv/src/unix/pthread-fixes.c in libuv-2.0.0

@@ -33,9 +33,10 @@
  * Note that this block of code must come before any inclusion of
  * pthread-fixes.h so that the real pthread_sigmask can be referenced.
  * */
 #include <errno.h>
 #include <pthread.h>
+#include <signal.h>
 
 int uv__pthread_sigmask(int how, const sigset_t* set, sigset_t* oset) {
   static int workaround;
 
   if (workaround) {