Gentoo's Bugzilla –
Attachment 850686 Details for
Bug 894176dev-tcltk/tclx-8.4.4-r1 fails to compile (MUSL-CLANG-SYSTEM): tclXunixSock.c:198:13: error: call to undeclared function rresvport; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]