build problems

[Werner Arnhold]

Hello,

I tried to build the program and ended up with this message:

Traceback (most recent call last):
  File "/usr/local/software/lilypond/build/../scripts/lilypond-
book.py", line 72, in <module>
    import book_base
ModuleNotFoundError: No module named 'book_base'
make[1]: *** [/usr/local/software/lilypond/build/.././make/lilypond-
book-rules.make:6: out/en/changes.texi] Error 1
make: ***
[/usr/local/software/lilypond/build/../stepmake/stepmake/generic-
targets.make:6: all] Fehler 2

I tried

find .. -name "book_base*"

and got

../build/python/out/book_base.pyc.dummy
../build/python/out/__pycache__/book_base.cpython-37.pyc
../python/book_base_test.py
../python/book_base.py

Any hint how to proceed? Thanks in advance!

Werner