/usr/share/doc/gdc-5-powerpc64le-linux-gnu/changelog.Debian.gz is in gdc-5-powerpc64le-linux-gnu 5.3.1-14ubuntu2cross1.
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It is a symlink to /usr/share/doc/gdc-5-powerpc64le-linux-gnu/../gcc-5-powerpc64le-linux-gnu-base/changelog.Debian.gz