1 files changed, 2 insertions, 0 deletions
diff --git a/condvar.c b/condvar.c
index dc98ec4..2615756 100644
--- a/condvar.c
+++ b/condvar.c
@@ -5,6 +5,8 @@
  * This translation unit implements condition variables and their primitives.
  */
 
+#include <errno.h>
+
 #include <windows.h>
 #include "pthread.h"