Check for existence of base64(1) before 'make dist'

common/Makefile

@@ -38,6 +38,7 @@ BUILD_DIR     = build.$(VERSION).$(OS)
 
 AWK  = awk
 CURL = curl
+B64ENCODE = base64
 
 .SILENT:
 
@@ -79,6 +80,9 @@ release: $(XPI) $(RDF)
 # This is not for you!
 dist: $(XPI)
 	@echo DIST $(XPI) $(GOOGLE)
+	set -e;							        	\
+	which $$(echo $(B64ENCODE) | $(AWK) '{print $1}') >/dev/null;		\
+								        	\
 	proj=$$(echo -n $(NAME) | sed 's/\(.\).*/\1/' | tr a-z A-Z);    	\
 	proj="$$proj$$(echo $(NAME) | sed 's/.//')";                    	\
 	[ -z "$$summary" ] && summary="$$proj $(VERSION) Release"; 		\
@@ -90,7 +94,7 @@ dist: $(XPI)
 	done;									\
 	$(CURL) "$$@" --form-string "summary=$$summary" 			\
 		-F "filename=@$(XPI)"						\
-		-H "Authorization: Basic $$(echo -n "$(GOOGLE_USER):$(GOOGLE_PASS)" | base64)" \
+		-H "Authorization: Basic $$(echo -n "$(GOOGLE_USER):$(GOOGLE_PASS)" | $(B64ENCODE))" \
 		-i "$(GOOGLE)" | sed -n '/^Location/{p;q}'
 
 $(RDF): $(RDF_IN) Makefile