Gentoo's Bugzilla –
Attachment 851212 Details for
Bug 894550app-misc/hddled-0.3 fails to compile (MUSL-CLANG-SYSTEM): hddled.c:99:11: error: call to undeclared function TEMP_FAILURE_RETRY; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]