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

* gnu/packages/compression.scm (zlib)[arguments]: Use 'modify-phases'.

gnu/packages/compression.scm

@@ -64,21 +64,21 @@
         "18dighcs333gsvajvvgqp8l4cx7h1x7yx9gd5xacnk80spyykrf3"))))
     (build-system gnu-build-system)
     (arguments
-     `(#:phases (alist-replace
+     `(#:phases
-                 'configure
+       (modify-phases %standard-phases
-                 (lambda* (#:key outputs #:allow-other-keys)
+         (replace 'configure
-                   ;; Zlib's home-made `configure' fails when passed
+           (lambda* (#:key outputs #:allow-other-keys)
-                   ;; extra flags like `--enable-fast-install', so we need to
+             ;; Zlib's home-made `configure' fails when passed
-                   ;; invoke it with just what it understand.
+             ;; extra flags like `--enable-fast-install', so we need to
-                   (let ((out (assoc-ref outputs "out")))
+             ;; invoke it with just what it understand.
-                     ;; 'configure' doesn't understand '--host'.
+             (let ((out (assoc-ref outputs "out")))
-                     ,@(if (%current-target-system)
+               ;; 'configure' doesn't understand '--host'.
-                           `((setenv "CHOST" ,(%current-target-system)))
+               ,@(if (%current-target-system)
-                           '())
+                     `((setenv "CHOST" ,(%current-target-system)))
-                     (zero?
+                     '())
-                      (system* "./configure"
+               (zero?
-                               (string-append "--prefix=" out)))))
+                (system* "./configure"
-                 %standard-phases)))
+                         (string-append "--prefix=" out)))))))))
     (home-page "http://zlib.net/")
     (synopsis "Compression library")
     (description