1 files changed, 1 insertions, 1 deletions

diff --git a/Jamrules b/Jamrules
index 4a9b6553..16c4b489 100644
--- a/Jamrules
+++ b/Jamrules
@@ -54,7 +54,7 @@ switch $(OS)
 
 	case MACOSX :
 		FLAG_LDALL += -L/usr/X11R6/lib ;
-		FLAG_CCALL += -std=gnu99 -DHAVE_C99 ;
+		FLAG_CCALL += -I/usr/X11R6/include -std=gnu99 -DHAVE_C99 ;
 		FLAG_CCRELEASE = -DARCH_PPC -faltivec -fast ;
 
 	case MINGW :