The configure script of cmp is broken as it ignores -lncursesw and -ltinfo: configure:3611: gcc -o conftest -I/usr/include/ncurses6/ncursesw -I/usr/include/ncurses6 -DCRACKLIB_DICTPATH='"/usr/lib/cracklib_dict"' conftest.c -lncurses -lm >&5