Missing file? If so, apt-file, a tool that searches online repositories for a specific file, may be the answer. Occasionally, when building a package from source, disaster strikes and the whole process grinds to a halt due to a missing file. Fortunately, this is increasingly uncommon due to the maturity of Linux package management and the ubiquity of Autoconf configuration scripts. However, some software projects don't use Autoconf, either because the maintainers prefer another solution such as CMake or because the program is too small to make setting up a configure script worthwhile.