gnu: clisp: Use modify-phases syntax.

* gnu/packages/lisp.scm (clisp)[arguments]: Use modify-phases syntax.

gnu/packages/lisp.scm

@@ -5,6 +5,7 @@
 ;;; Copyright © 2016 Federico Beffa <beffa@fbengineering.ch>
 ;;; Copyright © 2016 ng0 <ngillmann@runbox.com>
 ;;; Copyright © 2016 Andy Patterson <ajpatter@uwaterloo.ca>
+;;; Copyright © 2017 Ricardo Wurmus <rekado@elephly.net>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -207,8 +208,8 @@ (define-public clisp
        ;; --build=<triplet>.
        #:build #f
        #:phases
-       (alist-cons-after
-        'unpack 'patch-sh-and-pwd
+       (modify-phases %standard-phases
+         (add-after 'unpack 'patch-sh-and-pwd
            (lambda _
              ;; The package is very messy with its references to "/bin/sh" and
              ;; some other absolute paths to traditional tools.  These appear in
@@ -218,13 +219,13 @@ (define-public clisp
              (substitute* (find-files "." "configure|Makefile")
                (("/bin/sh") "sh"))
              (substitute* '("src/clisp-link.in")
-            (("/bin/pwd") "pwd")))
-        (alist-cons-before
-         'build 'chdir-to-source
+               (("/bin/pwd") "pwd"))
+             #t))
+         (add-before 'build 'chdir-to-source
            (lambda _
              ;; We are supposed to call make under the src sub-directory.
-           (chdir "src"))
-         %standard-phases))
+             (chdir "src")
+             #t)))
        ;; Makefiles seem to have race conditions.
        #:parallel-build? #f))
     (home-page "http://www.clisp.org/")