For Linux/Alpha you need to apply the patch below.
Just type `patch scripts/mgnuc < README.Linux-Alpha'.
This patch is needed to make the Boehm collector work
with the GNU assembler on Alphas.

Index: mgnuc.in
===================================================================
RCS file: /home/mercury1/repository/mercury/scripts/mgnuc.in,v
retrieving revision 1.48
diff -u -u -r1.48 mgnuc.in
--- mgnuc.in	1998/03/11 05:58:58	1.48
+++ mgnuc.in	1998/04/01 18:34:19
@@ -60,7 +60,8 @@
 CC=${MERCURY_C_COMPILER="@CC@"}
 CFLAGS_FOR_REGS="@CFLAGS_FOR_REGS@"
 CFLAGS_FOR_GOTOS="@CFLAGS_FOR_GOTOS@"
-AS=as
+# AS=as
+AS="gcc -c -x assembler-with-cpp"
 
 case "$CC" in
     *gcc*)