diff --git a/pkgs/development/tools/misc/arcanist/default.nix b/pkgs/development/tools/misc/arcanist/default.nix
index 02fe572edabd..a8e779347d80 100644
--- a/pkgs/development/tools/misc/arcanist/default.nix
+++ b/pkgs/development/tools/misc/arcanist/default.nix
@@ -22,16 +22,16 @@ stdenv.mkDerivation rec {
   unpackPhase = "true";
   buildPhase = ''
     ORIG=`pwd`
-    chmod +w -R ${libphutil}
-    cd ${libphutil}/support/xhpast
-    ls
+    cp -R ${libphutil} libphutil
+    cp -R ${arcanist} arcanist
+    cd libphutil/support/xhpast
     make clean all install
     cd $ORIG
   '';
   installPhase = ''
     mkdir -p $out/bin $out/libexec
-    cp -R ${libphutil} $out/libexec/libphutil
-    cp -R ${arcanist}  $out/libexec/arcanist
+    cp -R libphutil $out/libexec/libphutil
+    cp -R arcanist  $out/libexec/arcanist
 
     ln -s $out/libexec/arcanist/bin/arc $out/bin
     wrapProgram $out/bin/arc \