be slightly nicer when defining R_OK

diff --git a/ext/gd/libgd/gdft.c b/ext/gd/libgd/gdft.c
index fd6e7df5c51cb45b88a7026ab5e866fa9c517910..b94a56a3cfa4f2be1e3d8d6b89c7d8aeb6ec2c9c 100644 (file)
--- a/ext/gd/libgd/gdft.c
+++ b/ext/gd/libgd/gdft.c
@@ -16,7 +16,9 @@
 #include <unistd.h>
 #else
 #include <io.h>
-#define R_OK 04                        /* Needed in Windows */
+#ifndef R_OK
+# define R_OK 04                       /* Needed in Windows */
+#endif
 #endif
 
 #ifdef WIN32