The Travis CI build failures are due to exceeding the time limit.

The way Qt5 dependencies are specified is different from Qt4.

1. use libsForQt5.callPackage instead of regular callPackage.
2. Don't pass "qt59" (due to the item above), instead use the sub attributes from the qt5 attribute set such as qtbase, qtx11extras and so on.

Thanks for the great feedback, @peterhoeg! I've made the changes you suggested, and had the extremely welcome surprise of those changes not changing the hash of the package, so I don't have to wait for another multi-hour build! 🙌

so I don't have to wait for another multi-hour build!

I will strongly recommend working against nixos-unstable instead of master so that all your dependencies are pre-built. That dramatically cuts down on the build time.

I work off of channels/nixpkgs-unstable, so pcl is the only thing being built. It just takes ages. Which I will now experience because moving cmake does change the hash. I'll report back tomorrow.

Still works for me, so I hope we're good to go.

I'll try building it on NixOS.

If you'd like to try building something that uses PCL to ensure that the GUI components work, here is a test application they provide in their docs that I have packaged for nix for my own testing.

Thanks!