Include errno.h.

diff --git a/linuxthreads/ptfork.c b/linuxthreads/ptfork.c
index 8a7b797..32b1d26 100644 (file)
--- a/linuxthreads/ptfork.c
+++ b/linuxthreads/ptfork.c
@@ -14,6 +14,7 @@
 
 /* The "atfork" stuff */
 
+#include <errno.h>
 #include <stddef.h>
 #include <stdlib.h>
 #include <unistd.h>