diff --git a/pkg-def.scm b/pkg-def.scm
new file mode 100644
index 0000000..5bca348
--- /dev/null
+++ b/pkg-def.scm
@@ -0,0 +1,42 @@
+;; Package definition for the installation library itself.
+
+;; Template for scsh-install-pkg script, must be plugged with the
+;; directory containing the Scheme code.
+(define scsh-install-pkg-template #<<END
+#!/bin/sh
+exec scsh -le ~a/load.scm -o install-lib -e install-main -s "$0" "$@"
+!#
+
+END
+)
+
+(define-package "install-lib" (1 1 0)
+  ((options (bindir "Destination directory for executables" "<dir>" #t #f #f
+                    ,identity ,identity)))
+
+  (let ((bindir (get-option-value 'bindir)))
+    (if (not bindir)
+        (display-error-and-exit
+         "no binary directory specified (use --bindir option)."))
+
+    ;; Install "package" part (doc & Scheme code)
+    (install-file "doc/proposal.pdf" 'doc "pdf")
+    (install-files '("scheme/install-lib.scm" "scheme/install-lib-module.scm")
+                   'scheme)
+    (write-to-load-script
+     `((config)
+       (load ,(absolute-file-name "install-lib-module.scm"
+                                  (get-directory 'scheme #f)))
+       (user)))
+
+    ;; Install "program" part (scsh-install-pkg script).
+    (if (or (get-option-value 'dry-run) (get-option-value 'verbose))
+        (format #t "creating scsh-install-pkg script in ~a\n" bindir))
+
+    (if (not (get-option-value 'dry-run))
+        (begin
+          (create-directory&parents bindir #o755)
+          (call-with-output-file (absolute-file-name "scsh-install-pkg" bindir)
+            (lambda (port)
+              (format port scsh-install-pkg-template (get-directory 'base #f))
+              (set-file-mode port #o755)))))))