Gentoo's Bugzilla –
Attachment 842869 Details for
Bug 886127sci-chemistry/psi-3.4.0-r2 fails to compile (CLANG-STRICTER-SYSTEM): parse.y:68:2: error: call to undeclared function ip_error; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]