Modified: trunk/dports/lang/gprolog/Portfile (73975 => 73976)

--- trunk/dports/lang/gprolog/Portfile	2010-11-30 21:31:27 UTC (rev 73975)
+++ trunk/dports/lang/gprolog/Portfile	2010-11-30 22:01:06 UTC (rev 73976)
@@ -50,3 +50,13 @@
 	file copy -force -- ${workpath}/${name}-${version}/COPYING ${resources}/License.txt
 	file copy -force -- ${workpath}/${name}-${version}/README ${resources}/ReadMe.txt
 }
+
+# ticket #21172
+supported_archs i386 ppc
+platform darwin 10 {
+    pre-fetch {
+        if {[sysctl hw.cpu64bit_capable] == 1} {
+            return -code error "$name $version cannot build on x86_64 systems."
+        }
+    }
+}