What follows are the steps I took to build PCRaster on Fedora (34) from source. I chose to build from source because I didn't want to use the conda installer and I could not find a stand alone package.
The process below assumes that you have a working QGIS build environment since some of the PCRaster dependencies are provided by the QGIS dependency tree too.
git clone email@example.com:pcraster/pcraster.git cd pcraster/ mkdir build cd build/ sudo dnf install boost-devel qt5-qtcharts-devel xerces-c-devel ncurses-devel ccmake .. make -j 20 sudo make install
After doing that, start QGIS and install the PCRaster QGIS plugin.
Once installed, you should see a new PCRaster group in your processing panel: