ERLC ../ebin/yaws_compile.beam
compile: warnings being treated as errors
yaws_config.erl:3563:20: file:pid2name/1 is deprecated and will be removed in OTP 27; this functionality is no longer supported
% 3563| {ok, Config} = file:pid2name(FD),
% | ^
yaws_config.erl:3579:20: file:pid2name/1 is deprecated and will be removed in OTP 27; this functionality is no longer supported
% 3579| {ok, Config} = file:pid2name(FD),
% | ^
gmake[1]: *** [Makefile:664: ../ebin/yaws_config.beam] Error 1
After installing erlang 27, I see: