(use-modules (guix packages)
             (guix git-download)
             (gnu packages web))

(define custom-ikiwiki
  (let ((commit "43b44dbbda102ff0e7f00693c3a80c7af10f2a7e"))
    (package
      (inherit ikiwiki)
      (source (origin
                (method git-fetch)
                (uri (git-reference
                      (url "http://git.cbaines.net/ikiwiki")
                      (commit commit)))
                (sha256
                 (base32
                  "1mqlh779kcql8nxjdfws9p2z7xyygn2xp4h6gc4vzc6m0lhb84m6"))
                (file-name (string-append "ikiwiki-" (string-take commit 7))))))))

custom-ikiwiki