Vamos doesn't emulate all of the AmigaOS functionality that lha requires, and there's no way of just giving vamos a Kickstart ROM or AmigaOS libraries to make it work.
The original Unix lha doesn't know about Amiga-specific file flags, but other than that it works well enough to create and extract Amiga compatible archives. If you have GCC and GNU Make installed, then you can build lha by just running "./configure" and "make":
https://osdn.jp/projects/lha/releases/22231
