Include <stdlib.h> for abs()

Tip.c:336:9: error: implicit declaration of function 'abs' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
        ksy += abs(ext->max_ink_extent.y);
               ^
1 error generated.

Signed-off-by: Jeremy Huddleston <jeremyhu@apple.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/Tip.c b/src/Tip.c
index 6881670..5f54d14 100644
--- a/src/Tip.c
+++ b/src/Tip.c
@@ -43,6 +43,8 @@
 #include <X11/Xaw3d/TipP.h>
 #include <X11/Xaw3d/XawInit.h>
 
+#include <stdlib.h>
+
 #define	TIP_EVENT_MASK (ButtonPressMask	  |	\
 			ButtonReleaseMask |	\
 			PointerMotionMask |	\