One of duplicate bugs contains a patch forcing compilation with gcc 4.9: https://bugs.launchpad.net/ubuntu/+source/fglrx-installer/+bug/1501276/comments/3 The patch is confirmed to be working in a further comment.
One of duplicate bugs contains a patch forcing compilation with gcc 4.9: /bugs.launchpad .net/ubuntu/ +source/ fglrx-installer /+bug/1501276/ comments/ 3
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The patch is confirmed to be working in a further comment.