> "/Users/carl/Development/lilypond/build/out/lybook-db/
> snippet-names-ece0c512da6daf7d9aff45809ce97556.ly"' returned non-zero exit
> status 1.
You have to check the log files in `lybook-db` to find the problematic
`.ly` file(s). Does `make test` succeed? You should actually try that
before running `make doc`...
BTW, if you execute `make test`, you are greeted with the following
advice:
```
To begin investigating regression-test crashes, try this:
grep -L systems.texi out/lybook-testdb/*/*log | sed s/log/ly/g | xargs grep
-H sourcefilename
Matching lines may provide original test source file names.
The .ly files in which they appear are preprocessed test input.
The corresponding .log files may have errors or warnings.
If the above is not helpful, try sifting through this:
find out/lybook-testdb -name "*.log" | xargs grep -H "\(error\|warning\)"
```
which can also be used for finding problems with `make doc` (but you
have to replace `lybook-testdb` with `lybook-db` in the above
commands).
Werner
