It is a feature of Python (in which frescobaldi is written) that a
program needn’t be compiled/installed to be run. You need to
1. get the source files for frescobaldi and python-ly from
<https://github.com/wbsoft>, either by downloading
<https://github.com/wbsoft/frescobaldi/archive/manuscript-viewer.zip>
and <https://github.com/wbsoft/python-ly/archive/master.zip> or using
‘git clone’ and checking out the ‘manuscript-viewer’ branch.
2. add the following three lines to ~/.bashrc, where
path/to/python-ly and path/to/frescobaldi are the paths to the
respective directories:
# add python-ly to PYTHONPATH
PYTHONPATH=path/to/python-ly:$PYTHONPATH
alias frescobaldi='path/to/frescobaldi/frescobaldi'
3. and then you can just run 'frescobaldi' on the command line to
test the feature.