Install into a stage directory fails: chown/chgrp: Operation not permitted

When the build is run with ```DESTDIR/PREFIX```, install fails:
```
===> include (install)
install  -C -o root -g wheel -m 444  /usr/ports/security/libhijack/work/libhijack-0.8.0-1-g50804aa/include/hijack.h /usr/ports/security/libhijack/work/stage/usr/local/include/
install: /usr/ports/security/libhijack/work/stage/usr/local/include/hijack.h: chown/chgrp: Operation not permitted
```