1 files changed, 1 insertions, 0 deletions
diff --git a/string.c b/string.c
index 75db0d22e8..390a9c3a58 100644
--- a/string.c
+++ b/string.c
@@ -24,6 +24,7 @@
 #define BEG(no) (regs->beg[(no)])
 #define END(no) (regs->end[(no)])
 
+#include <errno.h>
 #include <math.h>
 #include <ctype.h>