Cross-Platform Makefile Generator

-U <globbing_expr>
       Remove matching entries from CMake cache.

       This  option  may  be  used to remove one or more variables from the CMakeCache.txt file, globbing
       expressions using * and ? are supported. The option may be repeated for as many cache  entries  as
       desired.

       Use with care, you can make your CMakeCache.txt non-working.