Cmake fails to compile on openbsd

Development
8

Attempting compilation from amarok 3.1.0 source. Here is the command sequence:

$ cd ~/hack
$ ftp https://download.kde.org/stable/amarok/3.1.0/amarok-3.1.0.tar.xz
$ xzcat amarok-3.1.0.tar.xz | tar xvf -
$ cd amarok-3.1.0
$ mkdir amarok-3.1.0-build && cd amarok-3.1.0-build
$ cmake .. -DCMAKE_PREFIX_PATH='/usr/local/lib/qt5' \
 -DCMAKE_C_COMPILER=/usr/bin/clang \
 -DCMAKE_CXX_COMPILER=/usr/bin/clang++ \
 -DCMAKE_PREFIX_PATH=/usr/local/lib/qt5/cmake
$ make
$ doas make install