Add rpm target

Makefile

@@ -120,4 +120,39 @@ ppa: init-debian
 publish-ppa: ppa
 	dput ppa:yuezk/globalprotect-openconnect ../*.changes
 
-rpm:
+# Generate RPM sepc file
+rpm-spec:
+	rm -rf .rpm
+	mkdir -p .rpm
+
+	cp packaging/rpm/globalprotect-openconnect.spec.in .rpm/globalprotect-openconnect.spec
+	cp packaging/rpm/globalprotect-openconnect.changes.in .rpm/globalprotect-openconnect.changes
+
+	sed -i "s/@VERSION@/$(VERSION)/g" .rpm/globalprotect-openconnect.spec
+	sed -i "s/@REVISION@/$(REVISION)/g" .rpm/globalprotect-openconnect.spec
+	sed -i "s/@DATE@/$(shell date "+%a %b %d %Y")/g" .rpm/globalprotect-openconnect.spec
+
+	sed -i "s/@VERSION@/$(VERSION)/g" .rpm/globalprotect-openconnect.changes
+	sed -i "s/@DATE@/$(shell LC_ALL=en.US date -u "+%a %b %e %T %Z %Y")/g" .rpm/globalprotect-openconnect.changes
+
+# Ensure ../globalprotect-openconnect-*.tar.gz exists.
+rpm: rpm-spec
+	if [ ! -f ../$(PKG).tar.gz ]; then \
+		echo "Missing ../$(PKG).tar.gz"; \
+		exit 1; \
+	fi
+
+	rm -rf $(HOME)/rpmbuild
+	rpmdev-setuptree
+
+	cp ../$(PKG).tar.gz $(HOME)/rpmbuild/SOURCES/$(PKG_NAME).tar.gz
+
+	rpmbuild -ba .rpm/globalprotect-openconnect.spec
+
+	# Copy RPM package
+	cp $(HOME)/rpmbuild/RPMS/$(shell uname -m)/$(PKG_NAME)*.rpm .rpm
+
+	# Copy the SRPM only for x86_64.
+	if [ "$(shell uname -m)" = "x86_64" ]; then \
+		cp $(HOME)/rpmbuild/SRPMS/$(PKG_NAME)*.rpm .rpm \
+	fi