--- /tmp/ARToolKit/lib/SRC/AR/Makefile.in	2004-11-04 03:51:27.000000000 -0500
+++ ARToolKit/lib/SRC/AR/Makefile.in	2009-12-06 13:08:19.000000000 -0500
@@ -7,7 +7,9 @@
 #  compiler
 #
 CC= cc
-CFLAG= @CFLAG@ -I$(INC_DIR)
+# arUtil.c has some "common symbols" which can cause linking problems on Mac OS X:
+# http://gcc.gnu.org/ml/gcc/2005-06/msg00378.html
+CFLAG= @CFLAG@ -I$(INC_DIR) -fno-common
 #
 # For making the library
 #