diff --git a/Makefile b/Makefile
index 877ae62..722b95e 100644
--- a/Makefile
+++ b/Makefile
@@ -1,10 +1,12 @@
 DESTDIR ?=
 PREFIX ?= /usr/local
 
+VERSION = 0.1-RC5
+
 # SUBDIRS = lib asn2qder test rfc arpa2 itu
 SUBDIRS = lib tool test rfc
 
-SUBMAKE=$(MAKE) PREFIX='$(PREFIX)' DESTDIR='$(DESTDIR)'
+SUBMAKE=$(MAKE) PREFIX='$(PREFIX)' DESTDIR='$(DESTDIR)' VERSION='$(VERSION)'
 
 all:
 	#
@@ -20,6 +22,8 @@ install:
 uninstall:
 	@ $(foreach d,$(SUBDIRS),$(SUBMAKE) -C '$d' uninstall &&) echo "Uninstalled all subdirectories"
 
+$PHONY: clean
+
 clean:
 	@ $(foreach d,$(SUBDIRS),$(SUBMAKE) -C '$d' clean &&) echo "Cleaned all subdirectories"
 
diff --git a/lib/Makefile b/lib/Makefile
index 1eb3493..0ed50d0 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -6,23 +6,25 @@ CFLAGS=-Wall -Wextra -pedantic -Wstrict-prototypes -Wold-style-definition -Wwrit
 
 CC ?= gcc
 AR ?= ar
+DESTPATH=$(abspath $(DESTDIR)/$(PREFIX))
 
 all: $(TARGETS)
 
 install: $(TARGETS)
-	install $(TARGETS) '$(DESTDIR)$(PREFIX)/lib'
-	mkdir -p '$(DESTDIR)$(PREFIX)/include/quick-der'
-	install ../include/quick-der/api.h '$(DESTDIR)$(PREFIX)/include/quick-der'
-	mkdir -p '$(DESTDIR)$(PREFIX)/lib/pkgconfig'
-	( echo 'prefix=$(PREFIX)' ; echo 'exec_prefix=$${prefix}' ; echo 'includedir=$${prefix}/include' ; echo 'libdir=$${prefix}/lib' ; echo ; echo 'Name: quick-der' ; echo "Description: Quick \`n\' Easy DER library" ; echo 'Version: 0.0' ; echo 'URL: https://github.com/vanrein/quick-der' ; echo 'Cflags: -I$${includedir}' ; echo 'Libs: -L$${libdir} -lquickder' ) > '$(DESTDIR)$(PREFIX)/lib/pkgconfig/quick-der.pc'
+	mkdir -p "$(DESTPATH)/include/quick-der"
+	mkdir -p "$(DESTPATH)/lib/pkgconfig"
+	install $(TARGETS) "$(DESTPATH)/lib"
+	install ../include/quick-der/api.h "$(DESTPATH)/include/quick-der"
+	( echo 'prefix=$(DESTPATH)' ; echo 'exec_prefix=$${prefix}' ; echo 'includedir=$${prefix}/include' ; echo 'libdir=$${prefix}/lib' ; echo ; echo 'Name: quick-der' ; echo "Description: Quick \`n\' Easy DER library" ; echo 'Version: $(VERSION)' ; echo 'URL: https://github.com/vanrein/quick-der' ; echo 'Cflags: -I$${includedir}' ; echo 'Libs: -L$${libdir} -lquickder' ) > '$(DESTPATH)/lib/pkgconfig/quick-der.pc'
 
 uninstall:
-	for f in $(TARGETS); do rm -f "$(DESTDIR)$(PREFIX)/lib/$$f" ; done
-	rm -f '$(DESTDIR)$(PREFIX)/include/quick-der/api.h'
-	rmdir --ignore-fail-on-non-empty '$(DESTDIR)$(PREFIX)/include/quick-der'
-	rm -f '$(DESTDIR)$(PREFIX)/lib/pkgconfig/quick-der.pc'
-	rmdir --ignore-fail-on-non-empty '$(DESTDIR)$(PREFIX)/lib/pkgconfig'
+	for f in $(TARGETS); do rm -f "$(DESTPATH)/lib/$$f" ; done
+	rm -f '$(DESTPATH)/include/quick-der/api.h'
+	rmdir --ignore-fail-on-non-empty '$(DESTPATH)/include/quick-der'
+	rm -f '$(DESTPATH)/lib/pkgconfig/quick-der.pc'
+	rmdir --ignore-fail-on-non-empty '$(DESTPATH)/lib/pkgconfig'
 
+.PHONY: clean	
 clean:
 	rm -f $(OBJS) $(TARGETS)