Gentoo's Bugzilla –
Attachment 854304 Details for
Bug 896222media-gfx/libredwg-0.12.5-r1 fails to compile (MUSL-CLANG-SYSTEM): dwg2SVG.c:242:10: error: call to undeclared function strcasestr; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]