use local newcob.val if NIST returns HTML page instead of the file

gcc/cobol/nist/Makefile

@@ -459,16 +459,24 @@ $(ORIG): $(ARCHIVE)
 # Keep a copy of the .Z because uncompress(1) removes it.  Set the
 # date of the .Z to match that of newcob.val, so it's not downloaded
 # again.
+#
+# If the file cannot be uncompressed, use a local version, if extant.
 newcob.val: newcob.val.Z
 	cp $^ .$^
-	uncompress $^
+	uncompress $^ || {			\
+		file $^;			\
+		echo using local copy of $^;	\
+		cp -v $(HOME)/$^ $^;		\
+		cp $^ .$^;			\
+		uncompress $^;			\
+		}
 	cp .$^ $^
 	touch -r $@ $^
 
 URL = http://www.itl.nist.gov/div897/ctg/suites/newcob.val.Z
 newcob.val.Z:
 # The file from NIST doesn't exist, so we need to download it.
-	wget -O $@~ $(URL) || cp $(HOME)/$@ $@~
+	wget -O $@~ $(URL) || cp -v $(HOME)/$@ $@~
 	@mv $@~ $@