Gentoo's Bugzilla –
Attachment 885276 Details for
Bug 924859dev-tcltk/tdom-0.9.3 fails to compile: tclexpat.c:504:17: error: call to undeclared function XML_SetBillionLaughsAttackProtectionMaximumAmplification; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]