I followed the instructions here: https://chromium.googlesource.com/chromium/src/+/master/docs/win_cross.md

But when I try to build base_unittests, this is the result:

python ../../build/toolchain/win/tool_wrapper.py link-wrapper environment.x64 False ../../third_party/llvm-build/Release+Asserts/bin/lld-link --rsp-quoting=posix /nologo /OUT:./base_unittests.exe /PDB:./base_unittests.exe.pdb @./base_unittests.exe.rsp
../../third_party/llvm-build/Release+Asserts/bin/lld-link: error: unable to find mt.exe in PATH: No such file or directory

I verified that mt.exe is on the path in environment.x64, so I have no idea what's going on.

gn args:
target_os = "win"
is_debug = false
is_component_build = true
dcheck_always_on = true