.pro for Qt/Ros?

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Actually, you can use qmake in the same way independent of Qt. Nevertheless, cmake is the easier tool to use for this (imo).

I know that it doesn't depend on it. But just out of curiosity, do you know if it provides ways to integrate external tools such as rospack and generic tests for library, e.g. using pkg-config. I always had the feeling that it is pretty restricted.

pkgconfig is supported and you can do things like call a system command (rospack find) and use its output, custom build targets. cmake seems to be nicer to me. I remember setting up custom flex/bison targets was not pretty (but possible).