xxx = F$EXTRACT(4,line_len - 16,line)
$ IF xxx .EQS. "DynaLoader" THEN goto ext_loop ! omit
$ IF xxx .EQS. "SDBM_File/sdbm" THEN goto ext_loop ! sub extension - omit
+$ IF xxx .EQS. "Digest/MD5" .AND. -
+ F$GETSYI("HW_MODEL") .LT. 1024 .AND. ccversion .LE. 50390006 -
+ THEN goto ext_loop ! cannot compile MD5.c on VAX
$ IF F$EXTRACT(0,8,line) .EQS. "vms/ext/" THEN -
xxx = "VMS/" + F$EXTRACT(8,line_len - 20,line)
$ known_extensions = known_extensions + " ''xxx'"