gnu: bc: Use 'modify-phases' syntax.

* gnu/packages/algebra.scm (bc)[arguments]: Use 'modify-phases' syntax.

gnu/packages/algebra.scm

@@ -4,6 +4,7 @@
 ;;; Copyright © 2016 Nicolas Goaziou <mail@nicolasgoaziou.fr>
 ;;; Copyright © 2014 Mark H Weaver <mhw@netris.org>
 ;;; Copyright © 2016 Ricardo Wurmus <rekado@elephly.net>
+;;; Copyright © 2017 Efraim Flashner <efraim@flashner.co.il>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -479,7 +480,8 @@ binary.")
     (native-inputs `(("flex" ,flex)))
     (arguments
      '(#:phases
-       (alist-replace 'configure
+       (modify-phases %standard-phases
+         (replace 'configure
            (lambda* (#:key outputs #:allow-other-keys)
              ;; This old `configure' script doesn't support
              ;; variables passed as arguments.
@@ -493,8 +495,7 @@ binary.")
                  ;; PREFIX/{man,info}, but we want them in
                  ;; PREFIX/share/{man,info}.
                  (string-append "--mandir=" out "/share/man")
-                            (string-append "--infodir=" out "/share/info")))))
-                      %standard-phases)))
+                 (string-append "--infodir=" out "/share/info")))))))))
     (home-page "https://www.gnu.org/software/bc/")
     (synopsis "Arbitrary precision numeric processing language")
     (description