supports build of RPM packages, tested on openSUSE; closes #5

doc/makefile.am

@@ -42,9 +42,9 @@ dist-hook: ${devel_DATA}
 	cp -r html ${distdir}/
 
 install-data-hook:
-	chmod -R u+w ${develdir}
-	cp -r html/* ${develdir}/
+	chmod -R u+w $(DESTDIR)${develdir}
+	cp -r html/* $(DESTDIR)${develdir}/
 
 uninstall-hook:
-	-chmod -R u+w ${develdir}
-	-rm -rf ${develdir}/*
+	-chmod -R u+w $(DESTDIR)${develdir}
+	-rm -rf $(DESTDIR)${develdir}/*