tgetent() not found while compiling vim

This is because the system lacks the ncurses library, which can be resolved by installing libncurses5-dev.

sudo apt-get install libncurses5-dev

I solved it through this article. enter link description here

I had the exact same issue (recompiling vim to use YCM), and I fixed it by removing src/auto/config.cache (in the vim tree) and re-running ./configure. It seems an outdated configure cache was still there.