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As I'd like to play MP3 files on my Raspi 3B, I installed mpg123 together with the libmpg123-dev package so that I can call mpg123 from some host application. However, every time I call out123_open (), I get seven identical error messages, which read as follows:

[src/libout123/module.c:163] error: API version of module does not match (got 1, expected 2).

A brief look into the out123.h header file revealed 2 as the current API version. I've got libmpg123-dev from the sid branch, as the version from the stable branch lacks the out123 files I need.

What's wrong here? Thank you for any useful hints.

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  • Is the right header being pulled by your compiler? If you're using gcc, try gcc -H -fsyntax-only <yourfile.c> which will output the headers used, and edit that in your post if you can.
    – Aurora0001
    Commented Jan 20, 2018 at 18:26
  • OK, I've got a result: . /usr/include/mpg123.h .. /usr/include/fmt123.h . /usr/include/out123.h …which is basically what I expected.
    – Neppomuk
    Commented Jan 20, 2018 at 21:39
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    Hmm, odd. That sounds okay, but it definitely seems like your install has mixed up an older version or something. If you're running out of other options, the only idea I can suggest is the 'nuclear option' of trying a fresh OS image and installing libmpg123 again. Hopefully, though, you find a better solution.
    – Aurora0001
    Commented Jan 21, 2018 at 10:13
  • I strongly hope I'll find a more viable solution than re-installing everything. Supposedly, the DEB packages of mpg123 are full of bugs: The libmpg123-dev package from the stable branch lacked out123.h, so I had to take the package from the sid (= unstable) branch, yet this one isn't working wither. I've also left a support request on the mpg123 mailing list, but nobody has responded so far.
    – Neppomuk
    Commented Jan 21, 2018 at 17:13

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At least I've now got a workaround now: I got the sourcecode tarball from Github and compiled it myself. I know this isn't a very clean approach (especially not on production systems), but at least I've got a working mpg123 installation now.

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    Please accept your own answer with a click on the tick on its left side. Only this will finish the question and it will not pop up again year for year.
    – Ingo
    Commented Feb 26, 2020 at 9:45
  • Well, I've been hoping for a "real" solution, not just for a workaround.
    – Neppomuk
    Commented Feb 26, 2020 at 21:27

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