nickva edited a comment on issue #3571:
URL: https://github.com/apache/couchdb/issues/3571#issuecomment-855272434
@schneuwlym Erlang 19 would explain why you got an `undef` error there.
That `ceil/1` function is not present in Erlang 19. Unfortunately Erlang 19 is
not supported any longer for CouchDB 3.x releases.
From the error message it seems as if someone had "patched" the CouchDB
release to compile on 19.x and replaced the undefined `ceil/1` function (which
would have prevented compiling on < 20.0 releases) with `math:ceil/1`. However,
`math:ceil/1` is also not defined in < 20.0 release but we'd only find out
about it at runtime.
```
4> catch ceil(1.6).
{'EXIT',{{shell_undef,ceil,1,[]},
[{shell,shell_undef,2,[{file,"shell.erl"},{line,1061}]},
5> catch math:ceil(1.6).
{'EXIT',{undef,[{math,ceil,[1.6],[]},
{erl_eval,do_apply,6,[{file,"erl_eval.erl"},{line,674}]},
```
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