maintainer-feedback requested: [Bug 232754] x11-toolkits/gtkmm20: fix build with GCC-based architectures

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Bug 232754: x11-toolkits/gtkmm20: fix build with GCC-based architectures
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=232754



--- Description ---
This port needs USES=compiler:c++11-lang to build on GCC architectures.

Tested on powerpc64 and amd64.

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