By default run libtool by full path /usr/bin/libtool to avoid

conflict with possible GNU /usr/local/bin/libtool (which
is also often but not always named glibtool to avoid this).

m3-sys/cminstall/src/config-no-install/Darwin.common

@@ -127,7 +127,7 @@ proc configure_c_compiler() is
 end
 
 if not defined("SYSTEM_LIBTOOL")
-    readonly SYSTEM_LIBTOOL = "libtool"
+    readonly SYSTEM_LIBTOOL = "/usr/bin/libtool"
 end
 
 %------------------------------------------------ external system libraries ---