Failing to build luajit rolling release on windows

[tobil4sk]

$ pipx install git+https://github.com/luarocks/hererocks
...
$ hererocks C:\Users\runneradmin/haxe-ci/lua_env/lua-j@v2.1 -j@v2.1 -r@v3.13.0 -i --target mingw
Cloning LuaJIT from https://github.com/LuaJIT/LuaJIT @v2.1
Building LuaJIT @26fd1a7 (target: mingw)
"==== Building LuaJIT 2.1 ===="

mingw32-make -C src

mingw32-make[1]: Entering directory 'C:/Users/RUNNER~1/AppData/Local/Temp/tmpadzy1my3/LuaJIT/src'

"HOSTCC    host/minilua.o"

"HOSTLINK  host/minilua.exe"

"VERSION   luajit.h"

Error: host/genversion.lua:14: run from the wrong directory

mingw32-make[1]: *** [Makefile:673: luajit.h] Error 1

mingw32-make[1]: Leaving directory 'C:/Users/RUNNER~1/AppData/Local/Temp/tmpadzy1my3/LuaJIT/src'

mingw32-make: *** [Makefile:127: default] Error 2

Error: got exitcode 2 from command mingw32-make SHELL=cmd

Bisect points to: #26, specifically, the SHELL=cmd part. While SHELL=cmd is needed when running from cmd or powershell, it breaks when building in msys bash.