diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..92fbc2c
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,191 @@
+PACKAGE = 'package'
+VERSION = '0.1.0'
+
+PREFIX := /usr/local
+BINDIR := $(PREFIX)/bin
+LIBDIR := $(PREFIX)/lib
+SHAREDIR := $(PREFIX)/share
+INCLUDEDIR := $(PREFIX)/include
+MANDIR := $(SHAREDIR)/man
+LIBEXECDIR := $(PREFIX)/libexec
+
+CC := cc
+AR := ar
+RANLIB := ranlib
+CFLAGS := 
+LDFLAGS := 
+
+Q := @
+
+all: package assemble-apk.sh src/config.cr
+	@:
+
+package: src/main.cr src/config.cr src/context.cr src/instructions.cr src/main.cr src/package.cr src/recipe.cr src/sources.cr src/config.cr 
+	@echo '  CR >    package'
+	$(Q)crystal src/main.cr -o 'package'
+
+
+package.install: package
+	@echo '  IN >    $(BINDIR)/package'
+	$(Q)mkdir -p '$(DESTDIR)$(BINDIR)'
+	$(Q)install -m0755 package $(DESTDIR)$(BINDIR)/package
+
+package.clean:
+	@echo '  RM >    package'
+	$(Q)rm -f package
+
+package.uninstall:
+	@echo '  RM >    $(BINDIR)/package'
+	$(Q)rm -f '$(DESTDIR)$(BINDIR)/package'
+
+assemble-apk.sh:
+
+assemble-apk.sh.install: assemble-apk.sh
+	@echo '  IN >    $(LIBEXECDIR)/package/assemble-apk.sh'
+	$(Q)mkdir -p '$(DESTDIR)$(LIBEXECDIR)/package'
+	$(Q)install -m0755 assemble-apk.sh $(DESTDIR)$(LIBEXECDIR)/package/assemble-apk.sh
+
+assemble-apk.sh.clean:
+
+assemble-apk.sh.uninstall:
+	@echo '  RM >    $(LIBEXECDIR)/package/assemble-apk.sh'
+	$(Q)rm -f '$(DESTDIR)$(LIBEXECDIR)/package/assemble-apk.sh'
+
+src/config.cr: src/config.cr.in src
+	@echo '  SED >   src/config.cr'
+	$(Q)sed -e 's&@PREFIX@&$(PREFIX)&;s&@BINDIR@&$(BINDIR)&;s&@LIBDIR@&$(LIBDIR)&;s&@SHAREDIR@&$(SHAREDIR)&;s&@INCLUDEDIR@&$(INCLUDEDIR)&;s&@MANDIR@&$(MANDIR)&;s&@LIBEXECDIR@&$(LIBEXECDIR)&;' src/config.cr.in > 'src/config.cr'
+	$(Q)chmod +x 'src/config.cr'
+
+
+src/config.cr.install:
+	$(Q):
+
+src/config.cr.clean:
+	@echo '  RM >    src/config.cr'
+	$(Q)rm -f src/config.cr
+
+src/config.cr.uninstall:
+	@echo '  RM >    false/config.cr'
+	$(Q)rm -f '$(DESTDIR)false/config.cr'
+
+src:
+	$(Q)mkdir -p src
+$(DESTDIR)$(PREFIX):
+	@echo '  DIR >   $(PREFIX)'
+	$(Q)mkdir -p $(DESTDIR)$(PREFIX)
+$(DESTDIR)$(BINDIR):
+	@echo '  DIR >   $(BINDIR)'
+	$(Q)mkdir -p $(DESTDIR)$(BINDIR)
+$(DESTDIR)$(LIBDIR):
+	@echo '  DIR >   $(LIBDIR)'
+	$(Q)mkdir -p $(DESTDIR)$(LIBDIR)
+$(DESTDIR)$(SHAREDIR):
+	@echo '  DIR >   $(SHAREDIR)'
+	$(Q)mkdir -p $(DESTDIR)$(SHAREDIR)
+$(DESTDIR)$(INCLUDEDIR):
+	@echo '  DIR >   $(INCLUDEDIR)'
+	$(Q)mkdir -p $(DESTDIR)$(INCLUDEDIR)
+$(DESTDIR)$(MANDIR):
+	@echo '  DIR >   $(MANDIR)'
+	$(Q)mkdir -p $(DESTDIR)$(MANDIR)
+install: subdirs.install package.install assemble-apk.sh.install src/config.cr.install
+	@:
+
+subdirs.install:
+
+uninstall: subdirs.uninstall package.uninstall assemble-apk.sh.uninstall src/config.cr.uninstall
+	@:
+
+subdirs.uninstall:
+
+test: all subdirs subdirs.test
+	@:
+
+subdirs.test:
+
+clean: package.clean assemble-apk.sh.clean src/config.cr.clean
+
+distclean: clean
+
+dist: dist-gz dist-xz dist-bz2
+	$(Q)rm -- $(PACKAGE)-$(VERSION)
+
+distdir:
+	$(Q)rm -rf -- $(PACKAGE)-$(VERSION)
+	$(Q)ln -s -- . $(PACKAGE)-$(VERSION)
+
+dist-gz: $(PACKAGE)-$(VERSION).tar.gz
+$(PACKAGE)-$(VERSION).tar.gz: distdir
+	@echo '  TAR >   $(PACKAGE)-$(VERSION).tar.gz'
+	$(Q)tar czf $(PACKAGE)-$(VERSION).tar.gz \
+		$(PACKAGE)-$(VERSION)/src/config.cr.in \
+		$(PACKAGE)-$(VERSION)/src/context.cr \
+		$(PACKAGE)-$(VERSION)/src/instructions.cr \
+		$(PACKAGE)-$(VERSION)/src/main.cr \
+		$(PACKAGE)-$(VERSION)/src/package.cr \
+		$(PACKAGE)-$(VERSION)/src/recipe.cr \
+		$(PACKAGE)-$(VERSION)/src/sources.cr \
+		$(PACKAGE)-$(VERSION)/src/config.cr
+
+dist-xz: $(PACKAGE)-$(VERSION).tar.xz
+$(PACKAGE)-$(VERSION).tar.xz: distdir
+	@echo '  TAR >   $(PACKAGE)-$(VERSION).tar.xz'
+	$(Q)tar cJf $(PACKAGE)-$(VERSION).tar.xz \
+		$(PACKAGE)-$(VERSION)/src/config.cr.in \
+		$(PACKAGE)-$(VERSION)/src/context.cr \
+		$(PACKAGE)-$(VERSION)/src/instructions.cr \
+		$(PACKAGE)-$(VERSION)/src/main.cr \
+		$(PACKAGE)-$(VERSION)/src/package.cr \
+		$(PACKAGE)-$(VERSION)/src/recipe.cr \
+		$(PACKAGE)-$(VERSION)/src/sources.cr \
+		$(PACKAGE)-$(VERSION)/src/config.cr
+
+dist-bz2: $(PACKAGE)-$(VERSION).tar.bz2
+$(PACKAGE)-$(VERSION).tar.bz2: distdir
+	@echo '  TAR >   $(PACKAGE)-$(VERSION).tar.bz2'
+	$(Q)tar cjf $(PACKAGE)-$(VERSION).tar.bz2 \
+		$(PACKAGE)-$(VERSION)/src/config.cr.in \
+		$(PACKAGE)-$(VERSION)/src/context.cr \
+		$(PACKAGE)-$(VERSION)/src/instructions.cr \
+		$(PACKAGE)-$(VERSION)/src/main.cr \
+		$(PACKAGE)-$(VERSION)/src/package.cr \
+		$(PACKAGE)-$(VERSION)/src/recipe.cr \
+		$(PACKAGE)-$(VERSION)/src/sources.cr \
+		$(PACKAGE)-$(VERSION)/src/config.cr
+
+help:
+	@echo ' :: package-0.1.0'
+	@echo ''
+	@echo 'Generic targets:'
+	@echo '    - help           Prints this help message.'
+	@echo '    - all            Builds all targets.'
+	@echo '    - dist           Creates tarballs of the files of the project.'
+	@echo '    - install        Installs the project.'
+	@echo '    - clean          Removes compiled files.'
+	@echo '    - uninstall      Deinstalls the project.'
+	@echo ''
+	@echo 'CLI-modifiable variables:'
+	@echo '    - CC             ${CC}'
+	@echo '    - CFLAGS         ${CFLAGS}'
+	@echo '    - LDFLAGS        ${LDFLAGS}'
+	@echo '    - DESTDIR        ${DESTDIR}'
+	@echo '    - PREFIX         ${PREFIX}'
+	@echo '    - BINDIR         ${BINDIR}'
+	@echo '    - LIBDIR         ${LIBDIR}'
+	@echo '    - SHAREDIR       ${SHAREDIR}'
+	@echo '    - INCLUDEDIR     ${INCLUDEDIR}'
+	@echo '    - MANDIR         ${MANDIR}'
+	@echo '    - LIBEXECDIR     ${LIBEXECDIR}'
+	@echo ''
+	@echo 'Project targets: '
+	@echo '    - package        crystal'
+	@echo '    - assemble-apk.sh script'
+	@echo ''
+	@echo 'Makefile options:'
+	@echo '    - gnu:           false'
+	@echo '    - colors:        true'
+	@echo ''
+	@echo 'Rebuild the Makefile with:'
+	@echo '    zsh ./build.zsh -c'
+.PHONY: all subdirs clean distclean dist install uninstall help
+
diff --git a/project.zsh b/project.zsh
new file mode 100644
index 0000000..7ed4236
--- /dev/null
+++ b/project.zsh
@@ -0,0 +1,35 @@
+
+package=package
+version=0.1.0
+
+variables+=(
+	LIBEXECDIR  '$(PREFIX)/libexec'
+)
+
+targets=(package assemble-apk.sh)
+
+type[package]=crystal
+sources[package]=src/main.cr
+depends[package]="$(echo src/*.cr | sed 's| src/config.cr||') src/config.cr"
+
+type[assemble-apk.sh]=script
+
+targets+=(src/config.cr)
+type[src/config.cr]=script
+sources[src/config.cr]=src/config.cr.in
+auto[src/config.cr]=true # Don’t display it in `make help`.
+install[src/config.cr]=false
+
+# FIXME: Clean and upstream this.
+function script.install {
+	if [[ false == "${install[$target]}" ]]; then
+		write "$target.install:"
+		write "\t${Q}:"
+		write
+	else
+		binary.install "$@"
+	fi
+}
+
+install[assemble-apk.sh]='$(LIBEXECDIR)/package'
+
diff --git a/src/config.cr.in b/src/config.cr.in
new file mode 100644
index 0000000..4d60245
--- /dev/null
+++ b/src/config.cr.in
@@ -0,0 +1,4 @@
+
+# These values are changed by `make` at build-time.
+OWN_LIBEXEC_DIR        = "@LIBEXECDIR@/package"
+
diff --git a/src/context.cr b/src/context.cr
index e44d7b3..8d7b79a 100644
--- a/src/context.cr
+++ b/src/context.cr
@@ -1,4 +1,6 @@
 
+require "./config.cr"
+
 # FIXME: Where should this go? We can’t just leave it here. :(
 def pkginfo(package)
 	du = `du -sk #{package.fake_root_directory}`
@@ -92,7 +94,7 @@ class Package::Context
 			Dir.mkdir_p File.dirname package_target
 
 			# FIXME: This shouldn’t have to be in users’ PATH. libexec?
-			r = run package.fake_root_directory, "assemble-apk.sh", [
+			r = run package.fake_root_directory, "#{OWN_LIBEXEC_DIR}/assemble-apk.sh", [
 				package_target
 			]