diff --git a/project.zsh b/project.zsh
new file mode 100644
index 0000000..0c86a79
--- /dev/null
+++ b/project.zsh
@@ -0,0 +1,30 @@
+
+package=service
+version=0.1.0
+
+variables+=(
+	LIBEXECDIR  '$(PREFIX)/libexec'
+	SYSCONFDIR  '/etc'
+	VARSTATEDIR '/var'
+)
+
+targets=(service status)
+
+for target in service status; do
+	type[$target]=crystal
+	sources[$target]=src/${target}.cr
+	depends[$target]=src/config.cr
+done
+
+targets+=(src/config.cr)
+type[src/config.cr]=script
+sources[src/config.cr]=src/config.cr.in
+auto[src/config.cr]=true # Don’t display it in `make help`.
+
+# FIXME: Redefining the backend so that script is not installed is a bit much.
+function script.install {
+	ofile.install "$@"
+}
+
+install[status]='$(LIBEXECDIR)/service'
+
diff --git a/src/config.cr b/src/config.cr
deleted file mode 100644
index ddd014a..0000000
--- a/src/config.cr
+++ /dev/null
@@ -1,8 +0,0 @@
-
-# Those are set to local to make testing easier. Will change at some point.
-PID_DIRECTORY = "./pid"
-RC_DIRECTORY  = "./rc"
-LOG_DIRECTORY = "./log"
-SERVICES_DIRECTORY = "./services"
-ENVIRONMENTS_DIRECTORY = "./environments"
-
diff --git a/src/config.cr.in b/src/config.cr.in
new file mode 100644
index 0000000..c815224
--- /dev/null
+++ b/src/config.cr.in
@@ -0,0 +1,8 @@
+
+# These values are changed by `make` at build-time.
+PID_DIRECTORY          = "@VARSTATEDIR@/pid"
+RC_DIRECTORY           = "@SYSCONFDIR@/rc/services"
+LOG_DIRECTORY          = "@VARSTATEDIR@/log"
+SERVICES_DIRECTORY     = "@SHAREDIR@/services"
+ENVIRONMENTS_DIRECTORY = "@SYSCONFDIR@/rc/environments"
+