Bug#831124: guitarix: FTBFS with GCC 6: ../libgxwmm/gxwmm/gainline.h:25:110: error: call of overloaded 'abs(double)' is ambiguous

[Hermann Meyer]

Hi

This is already fixed in upstream on 2016-05-16
here is the fix commit:
https://sourceforge.net/p/guitarix/git/ci/975b3b5cbd6b7b8a74f4da9eb687c9af8538178c/

regards
hermann