Kpathsea
Some TeX tools written in other languages will call kpsewhich. This program
provide this CLI API. You can search package by:
$ lx add -b kpathsea $ kpsewhich url.sty /home/wzy/Desktop/texrocks/packages/kpathsea/.lux/5.3/test_dependencies/5.3/9d30c278ce6738129492ba18692faf0bd87368b477c94e5db31e632f16acee21-latex-url@3.4-1/etc/tex/latex/url/url.sty $ lx remove -b kpathsea # it is not a build dependency, just for debug