Gentoo's Bugzilla –
Attachment 855106 Details for
Bug 898282sci-libs/hdf5-1.10.5-r1 fails to compile (MUSL-CLANG-SYSTEM): H5Odeprec.c:141:8: error: call to undeclared function H5CX_set_apl; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]