patch 8.1.2253: using "which" to check for an executable is not reliable Commit: https://github.com/vim/vim/commit/ad4de52510d5b4a949c0c9e25b5d5333744820b3 Author: Bram Moolenaar <Bram@vim.org> Date: Mon Nov 4 21:24:48 2019 +0100 patch 8.1.2253: using "which" to check for an executable is not reliable Problem: Using "which" to check for an executable is not reliable. Solution: Use "command -v" instead. Also exit with error code when generating tags has an error. (closes #5174)