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gcc-11 needs const operator() https://bugs.gentoo.org/768204 --- a/BPGame.h +++ b/BPGame.h @@ -53,7 +53,7 @@ class BPMiniGame; class SpriteFont; struct cmp_str { - bool operator()(char const *a, char const *b) { + bool operator()(char const *a, char const *b) const { return std::strcmp(a, b) < 0; } };