Change:
Since the most recent plasma5 update in nixos 17.03 ( by I'm unable to get the Task Manager widget to work. It just displays an error message - see attached screenshot. System: NixOS 17.03 @ Nix version: 1.11.8 Nixpkgs version: Sandboxing enabled: yes !
Related KDE bug:
I will revert the update until upstream gets its act together. Bumping dependency versions for a patch release is totally unacceptable.
How should I go about switching to the working build? I upgraded but it's still broken.
An idea of the update date on ?
If you fell experimental :-) you could try something what I did: git clone cd nixpkgs-channels git checkout nixos-17.03 git remote add nixpkgs git cherry-pick nixos-rebuild switch -I nixpkgs=xxxxx/nixpkgs-channels xxxxx = directory where you run your first command. Was very smooth for me... but cannot promise anything :-)
It's work with 17.03

Discussion:
<ins> {stdenv, fetchurl, yacc, flex, pkgconfig, glib, xz}: stdenv.mkDerivation rec { version = "0.15.2"; name = "vala-${version}"; src = fetchurl { url = "mirror://gnome/sources/vala/0.15/${name}.tar.xz"; sha256 = "0g71zq6dpqrw2f40wfzdf18fdw41ymr17laqniy2kr622hkxdi8w"; }; buildNativeInputs = [ yacc flex pkgconfig xz ]; buildInputs = [ glib ]; meta = { description = "Compiler for the GObject type system"; homepage = "http://live.gnome.org/Vala"; license = "free-copyleft"; platforms = stdenv.lib.platforms.all; maintainers = [ stdenv.lib.maintainers.antono ]; }; } </ins>

<ins> {stdenv, fetchurl, yacc, flex, pkgconfig, glib, xz}: stdenv.mkDerivation rec { version = "0.16.1"; name = "vala-${version}"; src = fetchurl { url = "mirror://gnome/sources/vala/0.16/${name}.tar.xz"; sha256 = "1n708n9ixyy9qrzyv1wf4ybvcclx43ib9ki028wwpvkz6kv8zqlb"; }; buildNativeInputs = [ yacc flex pkgconfig xz ]; buildInputs = [ glib ]; meta = { description = "Compiler for the GObject type system"; homepage = "http://live.gnome.org/Vala"; license = "free-copyleft"; platforms = stdenv.lib.platforms.all; maintainers = [ stdenv.lib.maintainers.antono ]; }; } </ins>

{stdenv, fetchurl, yacc, flex, pkgconfig, glib, xz}: stdenv.mkDerivation rec { <del> name = "vala-0.14.2"; </del> <ins> version = "0.17.2"; name = "vala-${version}"; </ins> src = fetchurl { <del> url = mirror://gnome/sources/vala/0.14/vala-0.14.2.tar.xz; sha256 = "1l5kllw9vpwv24lzv9fp64l3sad46wpxgvsgryrwlrjg91w6jzl0"; </del> <ins> url = "mirror://gnome/sources/vala/0.17/${name}.tar.xz"; sha256 = "09i2s0dwmrk147ind2dx7nq845g12fp6fsjqrphhrr0dbi0zzgh3"; </ins> }; buildNativeInputs = [ yacc flex pkgconfig xz ];

meta = { description = "Compiler for the GObject type system"; homepage = "http://live.gnome.org/Vala"; <ins> license = "free-copyleft"; platforms = stdenv.lib.platforms.all; maintainers = [ stdenv.lib.maintainers.antono ]; </ins> }; }

urweb = callPackage ../development/compilers/urweb { }; <del> vala = callPackage ../development/compilers/vala { }; </del> <ins> vala = vala17; vala15 = callPackage ../development/compilers/vala/15.2.nix { }; vala16 = callPackage ../development/compilers/vala/16.1.nix { }; vala17 = callPackage ../development/compilers/vala/default.nix { }; </ins> visualcpp = callPackage ../development/compilers/visual-c++ { };