build: add LolUnit to the build rules.

Makefile.am

@@ -9,3 +9,13 @@ bench:
 	cd test && $(MAKE) $(AM_MAKEFLAGS) $@
 .PHONY: bench
 
+dist: lolunit-$(LOLUNIT_VERSION).tar.gz
+
+lolunit-$(LOLUNIT_VERSION).tar.gz:
+	rm -rf lolunit-$(LOLUNIT_VERSION)
+	mkdir lolunit-$(LOLUNIT_VERSION)
+	mkdir lolunit-$(LOLUNIT_VERSION)/lol
+	cp $(top_srcdir)/src/lol/unit.h lolunit-$(LOLUNIT_VERSION)/lol
+	tar cvzf lolunit-$(LOLUNIT_VERSION).tar.gz lolunit-$(LOLUNIT_VERSION)
+	rm -rf lolunit-$(LOLUNIT_VERSION)
+

configure.ac

@@ -7,6 +7,10 @@ AC_CANONICAL_SYSTEM
 AM_INIT_AUTOMAKE([no-define tar-ustar])
 dnl AM_MAINTAINER_MODE
 
+dnl Versioning of the separate software we ship
+LOLUNIT_VERSION=0.1
+AC_SUBST(LOLUNIT_VERSION)
+
 AM_CONFIG_HEADER(config.h)
 
 AM_PROG_CC_C_O