Gentoo's Bugzilla –
Attachment 911971 Details for
Bug 945020sci-mathematics/calc-2.13.0.1 fails to compile: func.c:8550:40: error: initialization of VALUE ()(void) {aka struct value ()(void)} from incompatible pointer type VALUE ()(int, VALUE ) {aka struct value ()(int, struct value )} [-Wincompatible-pointer-typ