For just about every other package I'd relax the -Werror that effectively
makes the build fail, however, let's be a bit more critical with gcc.
Closes: https://bugs.gentoo.org/630702
# NOTE: When masking a USE flag due to missing keywords, please file a keyword
# request bug for the hppa arch.
+# Andreas K. Hüttel <dilfridge@gentoo.org> (4 Oct 2017)
+# -fstack-protector is not supported for hppa, bug 630702
+>=sys-devel/gcc-6.0 ssp
+
# Michael Palimaka <kensington@gentoo.org> (30 Sep 2017)
# Required dependencies are not keyworded.
x11-themes/qtcurve plasma