/usr/share/man/man1/powerpc-linux-gnuspe-g++-5.1.gz is in g++-5-powerpc-linux-gnuspe 5.3.1-14ubuntu2cross1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man1/powerpc-linux-gnuspe-gcc-5.1.gz