in order to make gufw installation process work, it includes itself while installing. this raise the need that the build directory needs to be a valid python identifier too. this commit solves this issue.
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.