diff --git a/pkgs/applications/editors/monodevelop/default.nix b/pkgs/applications/editors/monodevelop/default.nix
index 737576a1da0d..4e8e6079ff16 100644
--- a/pkgs/applications/editors/monodevelop/default.nix
+++ b/pkgs/applications/editors/monodevelop/default.nix
@@ -1,26 +1,61 @@
-{stdenv, fetchgit
+{ stdenv, fetchurl, fetchgit
 , autoconf, automake, pkgconfig, shared_mime_info, intltool
-, glib, mono, gtk-sharp, gnome-sharp
+, glib, mono, gtk-sharp, gnome, gnome-sharp, unzip
 }:
 
 stdenv.mkDerivation rec {
-  version = "5.1.4.0";
-  revision = "7d45bbe2ee22625f125d0c52548524f02d005cca";
+  version = "5.7.0.660";
+  revision = "6a74f9bdb90d9415b597064d815c9be38b401fee";
   name = "monodevelop-${version}";
-  src = fetchgit {
-    url = https://github.com/mono/monodevelop.git;
-    rev = revision;
-    sha256 = "0qy12zdvb0jiic3pq1w9mcsz2wwxrn0m92abd184q06yg5m48g1b";
-  };
+
+  srcs = [
+    (fetchurl {
+      url = "http://download.mono-project.com/sources/monodevelop/${name}.tar.bz2";
+      sha256 = "0i9fpjkcys991dhxh02zf9imar3aj6fldk9ymy09vmr10f4d7vbf";
+    })
+    (fetchurl {
+      url = "https://launchpadlibrarian.net/153448659/NUnit-2.6.3.zip";
+      sha256 = "0vzbziq44zy7fyyhb44mf9ypfi7gvs17rxpg8c9d9lvvdpkshhcp";
+    })
+    (fetchurl {
+      url = "https://launchpadlibrarian.net/68057829/NUnit-2.5.10.11092.zip";
+      sha256 = "0k5h5bz1p2v3d0w0hpkpbpvdkcszgp8sr9ik498r1bs72w5qlwnc";
+    })
+    (fetchgit {
+      url = "https://github.com/mono/nuget-binary.git";
+      rev = "ecb27dd49384d70b6c861d28763906f2b25b7c8";
+      sha256 = "0dj0yglgwn07xw2crr66vl0vcgnr6m041pynyq0kdd0z8nlp92ki";
+    })
+  ];
+
+  sourceRoot = "monodevelop-5.7";
+
+  postPatch = ''
+    # From https://bugzilla.xamarin.com/show_bug.cgi?id=23696#c19
+
+    # it seems parts of MonoDevelop 5.2+ need NUnit 2.6.4, which isn't included
+    # (?), so download it and put it in the right place in the tree
+    mkdir -v -p packages/NUnit.2.6.3/lib
+    cp -vfR ../NUnit-2.6.3/bin/framework/* packages/NUnit.2.6.3/lib
+    mkdir -v -p packages/NUnit.Runners.2.6.3/tools/lib
+    cp -vfR ../NUnit-2.6.3/bin/lib/* packages/NUnit.Runners.2.6.3/tools/lib
+
+    # cecil needs NUnit 2.5.10 - this is also missing from the tar
+    cp -vfR ../NUnit-2.5.10.11092/bin/net-2.0/framework/* external/cecil/Test/libs/nunit-2.5.10
+
+    # the tar doesn't include the nuget binary, so grab it from github and copy it
+    # into the right place
+    cp -vfR ../nuget-binary-*/* external/nuget-binary/
+    '';
 
   buildInputs = [
     autoconf automake pkgconfig shared_mime_info intltool
-    mono gtk-sharp gnome-sharp
+    mono gtk-sharp gnome-sharp unzip
   ];
 
   preConfigure = "patchShebangs ./configure";
   preBuild = ''
-    cat > ./main/buildinfo <<EOF
+    cat > ./buildinfo <<EOF
     Release ID: ${version}
     Git revision: ${revision}
     Build date: 1970-01-01 00:00:01
@@ -31,9 +66,9 @@ stdenv.mkDerivation rec {
     for prog in monodevelop mdtool; do
     patch -p 0 $out/bin/$prog <<EOF
     2a3,5
-    > export MONO_GAC_PREFIX=${gtk-sharp}:\$MONO_GAC_PREFIX
+    > export MONO_GAC_PREFIX=${gnome-sharp}:${gtk-sharp}:\$MONO_GAC_PREFIX
     > export PATH=${mono}/bin:\$PATH
-    > export LD_LIBRARY_PATH=${glib}/lib:${gnome-sharp}/lib:${gtk-sharp}/lib:${gtk-sharp.gtk}/lib:\$LD_LIBRARY_PATH
+    > export LD_LIBRARY_PATH=${glib}/lib:${gnome.libgnomeui}/lib:${gnome.gnome_vfs}/lib:${gnome-sharp}/lib:${gtk-sharp}/lib:${gtk-sharp.gtk}/lib:\$LD_LIBRARY_PATH
     > 
     EOF
     done
@@ -43,5 +78,6 @@ stdenv.mkDerivation rec {
 
   meta = with stdenv.lib; {
     platforms = platforms.linux;
+    maintainers = with maintainers; [ obadz ];
   };
 }
diff --git a/pkgs/development/compilers/mono/default.nix b/pkgs/development/compilers/mono/default.nix
index 8137b2a3ab32..a9e0dd89e84c 100644
--- a/pkgs/development/compilers/mono/default.nix
+++ b/pkgs/development/compilers/mono/default.nix
@@ -6,10 +6,10 @@ let
 in
 stdenv.mkDerivation rec {
   name = "mono-${version}";
-  version = "3.8.0";
+  version = "3.12.1";
   src = fetchurl {
     url = "http://download.mono-project.com/sources/mono/${name}.tar.bz2";
-    sha256 = "0jraxsjn7ra6z02n4wjpbj21mxm2w50iqviqvfl0ajikbxahvf3i";
+    sha256 = "03dn68vignknzxy1rx75p16qx1ild27hixgvr5mw0j19mx9z332x";
   };
 
   buildInputs = [bison pkgconfig glib gettext perl libgdiplus libX11 ncurses zlib];
@@ -54,7 +54,7 @@ stdenv.mkDerivation rec {
     homepage = http://mono-project.com/;
     description = "Cross platform, open source .NET development framework";
     platforms = with stdenv.lib.platforms; linux;
-    maintainers = with stdenv.lib.maintainers; [ viric thoughtpolice ];
+    maintainers = with stdenv.lib.maintainers; [ viric thoughtpolice obadz ];
     license = stdenv.lib.licenses.free; # Combination of LGPL/X11/GPL ?
   };
 }
diff --git a/pkgs/development/libraries/gnome-sharp/default.nix b/pkgs/development/libraries/gnome-sharp/default.nix
index 5818726e345e..59f97e46bef0 100644
--- a/pkgs/development/libraries/gnome-sharp/default.nix
+++ b/pkgs/development/libraries/gnome-sharp/default.nix
@@ -12,6 +12,8 @@ stdenv.mkDerivation {
 
   patches = [ ./Makefile.in.patch ];
 
+  dontStrip = true;
+
   meta = with stdenv.lib; {
     homepage = http://www.mono-project.com/docs/gui/gtksharp/;
     description = "A .NET language binding for assorted GNOME libraries";