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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Failed to compile the emacs latest git master version on Ubuntu
 20.10.
Date: Fri, 11 Dec 2020 14:05:26 +0200
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Cc: Emacs-devel@gnu.org
To: Hongyi Zhao <hongyi.zhao@gmail.com>
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 (message from Hongyi Zhao on Fri, 11 Dec 2020 04:59:20 -0500)
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> From: Hongyi Zhao <hongyi.zhao@gmail.com>
> Date: Fri, 11 Dec 2020 04:59:20 -0500
> 
> On Ubuntu 20.10, I try to compile the emacs latest git master version
> but meet the following error:
> 
> /usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/10/../../../x86_64-linux-gnu/libm17n-core.a(mtext-wseg.o):
> undefined reference to symbol 'th_brk@@LIBTHAI_0.1'
> /usr/bin/ld: /lib/x86_64-linux-gnu/libthai.so.0: error adding symbols:
> DSO missing from command line
> collect2: error: ld returned 1 exit status
> make[1]: *** [Makefile:655: temacs] Error 1
> make[1]: Leaving directory '/home/werner/Public/editor/emacs/emacs.git/src'
> make: *** [Makefile:424: src] Error 2
> 
> Any hints for fixing this problem?

Install HarfBuzz, so that Emacs uses that for text shaping.  If you
already have HarfBuzz installed, reconfigure --without-m17n-flt, so
that the problematic library is not compiled into Emacs (you don't
need it if you have HarfBuzz).