"Configure failed" build failure(s) — clang 9.0.1

PackageVersionSupposed error messageFull log Bug report
asterisk 1:16.2.1~dfsg-2conftest.c:9:10: fatal error: 'ac_nonexistent.h' file not found Log
xdiskusage 1.48-10.1configure: error: installation or configuration problem: C++ compiler cannot create executables. Log

2 errors