Fix compiler warning - implicit declaration of function 'abs'

match_four.c:80:4: warning: implicit declaration of function 'abs'
[-Wimplicit-function-declaration]
    *dist++ = abs(q->x - p->x) + abs(q->y - p->y);

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/match_four.c b/src/match_four.c
index c7d2cd3..df88afb 100644
--- a/src/match_four.c
+++ b/src/match_four.c
@@ -1,5 +1,6 @@
 #include "match.h"
 #include <limits.h>
+#include <stdlib.h>
 
 typedef unsigned char u8;
 typedef unsigned int u32;