Possible FTS language detection packaging issue in Dovecot 2.4.x Debian packages

Hello,

Is anyone running Dovecot 2.4.4 with multilingual FTS flatcurve on Debian 12/13, using the packages from Dovecot.org?
I suspect a packaging/build issue related to language detection. It looks like libexttextcat is not included in the Debian build.

Simple reproduction  with doveadm:
        doveadm  fts tokenize -u localpart@domain 'This is the house. Das ist das Haus‘
          —>  Warning: Can't detect its language - assuming de
         ……

My suspicion:
If the "libexttextcat-dev" package was not installed during the "configure" step of the package creation process, then "HAVE_LANG_EXTTEXTCAT" will not be set.

And if the define "HAVE_LANG_EXTTEXTCAT" is not set during the compilation of "src/lib-language/language.c", then "language_textcat_init" always returns "LANGUAGE_DETECT_RESULT_UNKNOWN;". Consequently, doveadm invariably translates this return value into the message: "Warning: Can't detect its language - assuming $DEFAULT-LANG".

If I download the source code from Dovecot.org and build the dovecot vendor package myself, "language detection" works—provided that "libexttextcat-dev" has been installed beforehand.

My simple test to check whether the installed version contains „libexttextcat“:
(My build finds references to libexttextcat; the build from Dovecot.org finds none.)

nm --print-file-name --dynamic --undefined-only  /usr/lib/x86_64-linux-gnu/dovecot/*  | grep textcat
—> /usr/lib/x86_64-linux-gnu/dovecot/libdovecot-language.so.0.0.0:         U special_textcat_Init
—> /usr/lib/x86_64-linux-gnu/dovecot/libdovecot-storage.so.0.0.0:             U textcat_ReleaseClassifyFullOutput

Background:
In my self-built package, exttextcat-related symbols appear in both libdovecot-language and libdovecot-storage; I assume this is expected due to the build/link layout.

Regards,
Jens

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