That aside, even after ironing this out, the script will fail, unless you already have used U++ in past. Or if you don't have any build method called CLANG, as in my case. Some minimal build method should be inside the tarball, or should be generated by the script. It could use pkgconfig to fill in the include and library directories. Compiler can be set to c++, which is usually present regardless whether the system uses gcc or clang.