Provide both "make dist" and "make snap".

Makefile.in

@@ -130,16 +130,25 @@ update-version:
 	@OPT="-s`$(SHTOOL) version -lc -dshort version.c`"; \
 	$(SHTOOL) version -lc -n 'Petidomo' -p petidomo_ $$OPT version.c
 
+#   roll release or snapshot source distribution tarballs
 dist: distclean
-	@echo "Fixing source tree permissions"; \
-	$(SHTOOL) fixperm *
-	@echo "Rolling source distribution tarball"; \
+	@echo "Rolling RELEASE source distribution tarball"; \
+	$(SHTOOL) fixperm *; \
 	V=`$(SHTOOL) version -lc -dshort version.c`; \
 	$(SHTOOL) tarball \
 	    -o petidomo-$$V.tar.gz -d petidomo-$$V -u ossp -g petidomo \
 	    -e 'CVS,\.cvsignore,\.configure,ChangeLog*,\.\#.*,*~$$,\.[ao]$$' \
 		-c 'gzip -9' .; \
 	ls -l petidomo-$$V.tar.gz
+snap: distclean
+	@echo "Rolling SNAPSHOT source distribution tarball"; \
+	$(SHTOOL) fixperm *; \
+	D=`date '+%Y%d%m'`; \
+	$(SHTOOL) tarball \
+	    -o petidomo-SNAP-$$D.tar.gz -d petidomo-SNAP-$$V -u ossp -g petidomo \
+	    -e 'CVS,\.cvsignore,\.configure,ChangeLog*,\.\#.*,*~$$,\.[ao]$$' \
+		-c 'gzip -9' .; \
+	ls -l petidomo-SNAP-$$D.tar.gz
 
 # Dependencies