Introduce a Makefile that builds the gebuild script from gebuild.m4

.gentoo/app-misc/gebuilder/gebuilder-99999.ebuild

@@ -37,6 +37,7 @@ src_unpack() {
 src_install() {
 	insinto /usr/share/gebuilder
 	doins -r utils config
+	exeopts "-m0744"
 	exeinto /usr/bin
 	doexe gebuild
 	insopts "-m0755"

Makefile

@@ -0,0 +1,23 @@
+INSTALL ?= install
+PREFIX ?= /usr
+GEBUILDER_ROOT ?=$(PREFIX)/share/gebuilder/
+MANDIR ?= $(PREFIX)/share/man
+BINDIR ?= $(PREFIX)/bin/
+CACHEDIR ?= /var/cache/gebuilder
+IMAGESDIR ?= /var/lib/gebuilder
+
+BUILDFILES = gebuilder/gebuild
+
+all: gebuilder/gebuild
+
+gebuilder/gebuild: gebuilder/gebuild.m4 Makefile
+	m4 -DCACHEDIR=$(CACHEDIR) -DIMAGESDIR=$(IMAGESDIR) -DPREFIX=$(PREFIX) -DGEBUILDER_ROOT=$(GEBUILDER_ROOT) $< > $@
+	chmod a+x $@
+
+.PHONY: install
+install: gebuilder/gebuild doc/
+	cd gebuilder; find utils config -type f -exec install -D -m 0644 {} $(DESTDIR)$(GEBUILDER_ROOT)/{} \;
+	cd gebuilder; find example_hooks exec.sh scripts -type f -exec install -D -m 0755 {} $(DESTDIR)$(GEBUILDER_ROOT)/{} \;
+	$(INSTALL) -D -m 0755 -t $(DESTDIR)$(BINDIR) gebuilder/gebuild
+	$(INSTALL) -D -m 0644 -t $(DESTDIR)$(MANDIR)/man8/ doc/gebuild.8
+	$(INSTALL) -D -m 0644 -t $(DESTDIR)$(MANDIR)/man5/ doc/dotgentoo.5

gebuilder/gebuild → gebuilder/gebuild.m4

@@ -7,5 +7,6 @@ then
 	exit 1
 fi
 
-cd /var/lib/gebuilder/
-exec /usr/share/gebuilder/exec.sh "$@"
+cd "IMAGESDIR"
+export CACHE="CACHEDIR"
+exec "GEBUILDER_ROOT/exec.sh" "$@"