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They're used by QtBuildInternals to find other components configuration. With QT_HOST_PATH and QT_HOST_PATH_CMAKE_DIR set, cmake will only look into those directories.
BUILD STYLES ============ These shell snippets provide support for multiple build systems, i.e GNU configure, CMake, etc. A build style file must provide at least the following functions: - do_configure - do_build - do_install If a source package defines its own do_xxx() function, the function defined in the build style file is simply ignored.