if/then/else in Lilypond with config file

[Hartmut Leister]

Is there a possibility to do something like this?

    if( custom_cfg_flag)
    {
        % default score combination
        % (e.g. with header and chords)
    }
    else
    {
        % some other combination
        % (e.g. only melody)
    }

I want to combine Lilypond score files with different config files.
I would like to either
    * compile score files as stand alone with header and chords
    * add score files to booklets without header or chords

I would have
        * a first config file in my scores folder
      (with header and chords on)
    * a second one in my booklet folder
      (header and chords off)
    * and symlinks to my score files

I've read about the tags scheme, but can't figure out how to use them
for this special use case


A sample score file and include file can be found in
https://www.dropbox.com/sh/w2ekud6e507asdh/AACeoYQVTP1_9qQjZ_eUyZDua

Thanks
Hartmut

-- 
Hartmut Leister <address@hidden>