/usr/bin/luajit: /usr/share/lua/5.1/luarocks/fs/tools.lua:59: attempt to index local 'pipe' (a nil value)
stack traceback:
	/usr/share/lua/5.1/luarocks/fs/tools.lua:59: in function 'current_dir_with_cache'
	/usr/share/lua/5.1/luarocks/fs/tools.lua:73: in function 'current_dir'
	/usr/share/lua/5.1/luarocks/fs/unix.lua:50: in function 'absolute_name'
	/usr/share/lua/5.1/luarocks/fs/linux.lua:8: in function 'is_dir'
	/usr/share/lua/5.1/luarocks/fs/lua.lua:197: in function 'dir'
	/usr/share/lua/5.1/luarocks/fs/lua.lua:181: in function 'list_dir'
	/usr/share/lua/5.1/luarocks/fs/lua.lua:234: in function 'modules'
	/usr/share/lua/5.1/luarocks/cmd.lua:562: in function 'run_command'
	/usr/bin/luarocks:38: in main chunk
	[C]: at 0x563c257b0410