jedit: Fix build

pkgs/applications/editors/jedit/default.nix

@@ -1,20 +1,20 @@
-{ stdenv, fetchurl, ant, jre }:
+{ stdenv, fetchurl, ant, jdk }:
+
+let version = "4.4.2"; in
 
 stdenv.mkDerivation {
-  name = "jedit-4.4.2";
+  name = "jedit-${version}";
 
   src = fetchurl {
-    url = mirror://sourceforge/jedit/jedit4.4.2source.tar.bz2;
+    url = "mirror://sourceforge/jedit/jedit${version}source.tar.bz2";
     sha256 = "5e9ad9c32871b77ef0b9fe46dcfcea57ec52558d36113b7280194a33430b8ceb";
   };
 
-  setSourceRoot = ''
-    sourceRoot=jEdit
-  '';
+  buildInputs = [ ant jdk ];
 
-  buildPhase = ''
-     ant build
-  '';
+  sourceRoot = "jEdit";
+
+  buildPhase = "ant build";
 
   installPhase = ''
     mkdir -p $out/share/jEdit
@@ -27,7 +27,7 @@ stdenv.mkDerivation {
     cp -r macros/* $out/share/jEdit/macros
     mkdir -p $out/share/jEdit/doc
     cp -r doc/* $out/share/jEdit/doc
-    
+
     sed -i "s|Icon=.*|Icon=$out/share/jEdit/icons/jedit-icon48.png|g" package-files/linux/deb/jedit.desktop
     mkdir -p $out/share/applications
     mv package-files/linux/deb/jedit.desktop $out/share/applications/jedit.desktop
@@ -35,7 +35,7 @@ stdenv.mkDerivation {
     patch package-files/linux/jedit << EOF
     5a6,8
     > # specify the correct JAVA_HOME
-    > JAVA_HOME=${jre}
+    > JAVA_HOME=${jdk.jre}/lib/openjdk/jre
     > 
     EOF
     sed -i "s|/usr/share/jEdit/@jar.filename@|$out/share/jEdit/jedit.jar|g" package-files/linux/jedit
@@ -44,9 +44,7 @@ stdenv.mkDerivation {
     chmod +x $out/bin/jedit
   '';
 
-  buildInputs = [ ant ];
-
-  meta = { 
+  meta = {
     description = "Mature programmer's text editor (Java based)";
     homepage = http://www.jedit.org;
     license = "GPL";