Basic
- Don't try "unprivileged" build from start.
- First do cross-dirs/cross-tools/cross-distrib as root (sudo).
- Then change owner/mode of obj directories. This will make development easier.
- Always use cross build (for development).
- Otherwise you'll overwrite your /usr/include during build.
- Cross build can't make release on OpenBSD, unfortunately (because of gnu/, where Makefile.bsd-wrapper is used). So cross build is only for development.