maintainer-feedback requested: [Bug 237175] x11/xfce4-screenshooter-plugin: fix build with GCC-based architectures

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Bugzilla Automation <bugzilla at FreeBSD.org> has asked freebsd-xfce mailing list
<xfce at FreeBSD.org> for maintainer-feedback:
Bug 237175: x11/xfce4-screenshooter-plugin: fix build with GCC-based
architectures
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237175



--- Description ---
Sources use C99 features but GCC 4.2 by default compiles in C89. Set
USE_CSTD=c99 to fix build.

Tested on powerpc64 and amd64.