diff --git a/Makefile b/Makefile
index b9cd2c2..ecd96b8 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,6 @@
 include /usr/share/dpkg/pkg-info.mk
-export DEB_VERSION_UPSTREAM_REVISION
 
-export PACKAGE=proxmox-widget-toolkit
+PACKAGE=proxmox-widget-toolkit
 
 DEB=$(PACKAGE)_$(DEB_VERSION_UPSTREAM_REVISION)_all.deb
 DEV_DEB=$(PACKAGE)-dev_$(DEB_VERSION_UPSTREAM_REVISION)_all.deb
diff --git a/debian/rules b/debian/rules
index 2a6e77d..7932c57 100755
--- a/debian/rules
+++ b/debian/rules
@@ -3,6 +3,10 @@
 # output every command that modifies files on the build system.
 #DH_VERBOSE = 1
 
+include /usr/share/dpkg/pkg-info.mk
+
+export DEB_SOURCE
+export DEB_VERSION
 
 %:
 	dh $@
diff --git a/src/Makefile b/src/Makefile
index 66167fe..c0c99c0 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -120,9 +120,11 @@ lint: $(JSSRC)
 	eslint --strict $(JSSRC)
 	touch ".lint-incremental"
 
+BUILD_TIME=$(or $(SOURCE_DATE_EPOCH),$(shell date '+%s.%N'))
+BUILD_VERSION=$(or $(DEB_VERSION),$(shell git rev-parse HEAD),unknown version)
 proxmoxlib.js: .lint-incremental $(JSSRC)
 	# add the version as comment in the file
-	echo "// $(DEB_VERSION_UPSTREAM_REVISION)" > $@.tmp
+	echo "// v$(BUILD_VERSION) - t$(BUILD_TIME)" > $@.tmp
 	cat $(JSSRC) $(MARKEDJS)  >> $@.tmp
 	mv $@.tmp $@
 
diff --git a/src/defines.mk b/src/defines.mk
index c186edc..36d5353 100644
--- a/src/defines.mk
+++ b/src/defines.mk
@@ -1,3 +1,5 @@
+PACKAGE ?= $(or $(DEB_SOURCE), proxmox-widget-toolkit)
+
 DESTDIR=
 DOCDIR=$(DESTDIR)/usr/share/doc/$(PACKAGE)
 WWWBASEDIR=$(DESTDIR)/usr/share/javascript/$(PACKAGE)