diff --git a/pkgs/build-support/build-pecl.nix b/pkgs/build-support/build-pecl.nix
index 727ed0c2197..135b68186f3 100644
--- a/pkgs/build-support/build-pecl.nix
+++ b/pkgs/build-support/build-pecl.nix
@@ -1,11 +1,23 @@
-{ stdenv, php, autoreconfHook }:
+{ stdenv, php, autoreconfHook, fetchurl }:
 
-args@{ name, ... }: stdenv.mkDerivation (args // {
+{ name
+, buildInputs ? []
+, makeFlags ? []
+, src ? fetchurl {
+    url = "http://pecl.php.net/get/${name}.tgz";
+    inherit (args) sha256;
+  }
+, ...
+}@args:
+
+stdenv.mkDerivation (args // {
   name = "php-${name}";
 
-  buildInputs = [ php autoreconfHook ] ++ args.buildInputs or [];
+  inherit src;
 
-  makeFlags = [ "EXTENSION_DIR=$(out)/lib/php/extensions" ] ++ args.makeFlags or [];
+  buildInputs = [ php autoreconfHook ] ++ buildInputs;
+
+  makeFlags = [ "EXTENSION_DIR=$(out)/lib/php/extensions" ] ++ makeFlags;
 
   autoreconfPhase = "phpize";
 })
diff --git a/pkgs/top-level/php-packages.nix b/pkgs/top-level/php-packages.nix
index 39ea219cf64..6695f9d3a93 100644
--- a/pkgs/top-level/php-packages.nix
+++ b/pkgs/top-level/php-packages.nix
@@ -3,16 +3,13 @@
 let self = with self; {
   buildPecl = import ../build-support/build-pecl.nix {
     inherit php;
-    inherit (pkgs) stdenv autoreconfHook;
+    inherit (pkgs) stdenv autoreconfHook fetchurl;
   };
 
   memcache = buildPecl {
     name = "memcache-3.0.8";
 
-    src = pkgs.fetchurl {
-      url = http://pecl.php.net/get/memcache-3.0.8.tgz;
-      sha256 = "04c35rj0cvq5ygn2jgmyvqcb0k8d03v4k642b6i37zgv7x15pbic";
-    };
+    sha256 = "04c35rj0cvq5ygn2jgmyvqcb0k8d03v4k642b6i37zgv7x15pbic";
 
     configureFlags = "--with-zlib-dir=${pkgs.zlib}";
   };
@@ -20,10 +17,7 @@ let self = with self; {
   memcached = buildPecl {
     name = "memcached-2.1.0";
 
-    src = pkgs.fetchurl {
-      url = http://pecl.php.net/get/memcached-2.1.0.tgz;
-      sha256 = "1by4zhkq4mbk9ja6s0vlavv5ng8aw5apn3a1in84fkz7bc0l0jdw";
-    };
+    sha256 = "1by4zhkq4mbk9ja6s0vlavv5ng8aw5apn3a1in84fkz7bc0l0jdw";
 
     configureFlags = [
       "--with-zlib-dir=${pkgs.zlib}"
@@ -35,26 +29,20 @@ let self = with self; {
 
   xdebug = buildPecl rec {
     name = "xdebug-2.2.5";
-    src = pkgs.fetchurl {
-      url = "http://pecl.php.net/get/${name}.tgz";
-      sha256 = "0vss35da615709kdvqji8pblckfvmabmj2njjjz6h8zzvj9gximd";
-    };
+
+    sha256 = "0vss35da615709kdvqji8pblckfvmabmj2njjjz6h8zzvj9gximd";
   };
 
   apc = buildPecl rec {
     name = "apc-3.1.13";
-    src = pkgs.fetchurl {
-      url = "http://pecl.php.net/get/${name}.tgz";
-      sha256 = "1gcsh9iar5qa1yzpjki9bb5rivcb6yjp45lmjmp98wlyf83vmy2y";
-    };
+
+    sha256 = "1gcsh9iar5qa1yzpjki9bb5rivcb6yjp45lmjmp98wlyf83vmy2y";
   };
 
   zmq = buildPecl rec {
     name = "zmq-1.1.2";
-    src = pkgs.fetchurl {
-      url = "http://pecl.php.net/get/${name}.tgz";
-      sha256 = "0ccz73p8pkda3y9p9qbr3m19m0yrf7k2bvqgbaly3ibgh9bazc69";
-    };
+
+    sha256 = "0ccz73p8pkda3y9p9qbr3m19m0yrf7k2bvqgbaly3ibgh9bazc69";
 
     configureFlags = [
       "--with-zmq=${pkgs.zeromq2}"