diff --git a/Makefile b/Makefile
index 2b457cb..538a73c 100644
--- a/Makefile
+++ b/Makefile
@@ -1,3 +1,8 @@
+SHELL = /bin/sh
+.SUFFIXES:
+
+version := 0.1
+
 s48-interfaces := $(shell find s48 \
                     -maxdepth 2 -mindepth 2 \
                     -name interfaces.scm)
@@ -20,18 +25,32 @@ all : s48 scsh
 s48 : $(s48-targets)
 scsh : $(scsh-targets)
 
-s48-interfaces.scm : $(s48-interfaces)
+s48-interfaces.scm : $(s48-interfaces) build/header.scm
 	cat build/header.scm $(s48-interfaces) > s48-interfaces.scm
 
-s48-packages.scm : $(s48-packages)
+s48-packages.scm : $(s48-packages) build/header.scm
 	build/xpackages.scm s48-packages.scm build/header.scm $(s48-packages)
 
-interfaces.scm : $(s48-interfaces) $(scsh-interfaces)
+interfaces.scm : $(s48-interfaces) $(scsh-interfaces) build/header.scm
 	cat build/header.scm $(s48-interfaces) $(scsh-interfaces) > interfaces.scm
 
-packages.scm : $(s48-packages) $(scsh-packages)
+packages.scm : $(s48-packages) $(scsh-packages) build/header.scm
 	build/xpackages.scm packages.scm build/header.scm $(s48-packages) $(scsh-packages)
 
-.PHONY : clean
+.PHONY : dist
+dist :
+	mkdir sunterlib-$(version)
+	cp COPYING Makefile NEWS README sunterlib-$(version)/
+	cp -r build sunterlib-$(version)/build
+	cp -r s48 sunterlib-$(version)/s48
+	cp -r scsh sunterlib-$(version)/scsh
+	find sunterlib-0.1/ -name CVS | xargs rm -rf
+	tar -czf sunterlib-$(version).tar.gz sunterlib-$(version)
+	rm -rf sunterlib-$(version)
+
+.PHONY : clean distclean
 clean :
 	-rm -f $(targets)
+
+distclean : clean
+	-rm -rf sunterlib-$(version) sunterlib-$(version).tar.gz