ktouch 18.12.0 not building

[billksun]

Issue description

Cannot install ktouch.

CMake Error at /nix/store/yjj7f7lypknwzbxvkvjkf8aa0av6ss0d-qtbase-5.12.0-dev/lib/cmake/Qt5/Qt5Config.cmake:28 (find_package):
  By not providing "FindQt5XmlPatterns.cmake" in CMAKE_MODULE_PATH this
  project has asked CMake to find a package configuration file provided by
  "Qt5XmlPatterns", but CMake did not find one.

  Could not find a package configuration file provided by "Qt5XmlPatterns"
  with any of the following names:

    Qt5XmlPatternsConfig.cmake
    qt5xmlpatterns-config.cmake

  Add the installation prefix of "Qt5XmlPatterns" to CMAKE_PREFIX_PATH or set
  "Qt5XmlPatterns_DIR" to a directory containing one of the above files.  If
  "Qt5XmlPatterns" provides a separate development package or SDK, be sure it
  has been installed.
Call Stack (most recent call first):
  CMakeLists.txt:26 (find_package)


-- Configuring incomplete, errors occurred!
See also "/build/ktouch-18.12.0/build/CMakeFiles/CMakeOutput.log".
builder for '/nix/store/5rdm9n26gmc1wqqwx3mbqy0awksgp9s1-ktouch-18.12.0.drv' failed with exit code 1
error: build of '/nix/store/5rdm9n26gmc1wqqwx3mbqy0awksgp9s1-ktouch-18.12.0.drv' failed

Steps to reproduce

1. nix-env -i ktouch

Technical details

• system: "x86_64-linux"
• host os: Linux 4.19.20, NixOS, 19.03pre168613.ffc604e5579 (Koi)
• multi-user?: yes
• sandbox: yes
• version: nix-env (Nix) 2.2
• channels(root): "nixos-19.03pre169895.fa82ebccf66"
• channels(bill): "home-manager"
• nixpkgs: /nix/var/nix/profiles/per-user/root/channels/nixos