Clipper1

[jklap]

By simply changing how you are building Clipper1 you can avoid changes to it's related pri file:

wget https://sourceforge.net/projects/polyclipping/files/clipper_ver6.4.2.zip/download
unzip clipper_ver6.4.2.zip -d Clipper1
cd Clipper1/cpp
cmake -S . -B build -D CMAKE_INSTALL_PREFIX=../6.4.2
cmake --build ./build --target install

[DanielBarie]

Yes. This is shadow building into the pre-configured directory. Would you open a pull request including a modified archive?
Edit: This may be applied to pretty much all dependencies.