--- mercury-extras-0.13.1.orig/concurrency/Mmakefile	2006-04-20 19:43:31.000000000 +1200
+++ mercury-extras-0.13.1/concurrency/Mmakefile	2006-12-04 21:56:38.000000000 +1300
@@ -8,6 +8,8 @@
 
 TESTS = philo philo2 philo3 midimon
 
+LIBGRADES := $(LIBGRADES:hlc.gc=)
+
 -include ../Mmake.params
 
 default_target: all