Version of OpenTTD

1.11.beta2

Expected result

Successful compilation.

Actual result

ld: multiple definition of `SetFallbackFont...`
ld: undefined reference to `FcInit'

Steps to reproduce

wget https://github.com/OpenTTD/OpenTTD/archive/1.11.0-beta2.tar.gz
tar -xvf 1.11.0-beta2.tar.gz
mkdir build
cd build
cmake -DOPTION_DEDICATED:STRING=1 ..
make

Temporary workaround

Step one

src/fontcache.cpp:738
from:

bool SetFallbackFont(FreeTypeSettings *settings, const char *language_isocode, int winlangid, MissingGlyphSearcher *callback); { return false; }

to:

extern bool SetFallbackFont(FreeTypeSettings *settings, const char *language_isocode, int winlangid, MissingGlyphSearcher *callback);

Step two

after a failed build go to
build/CMakeFiles/openttd.dir/link.txt
and add the param
-lfontconfig

Did not have time to find the actual reason of the issue - sorry.

Environment

Ubuntu 20.04 64bit
apt-get update
# GNU Make 4.2.1
apt install make
# cmake version 3.16.3
apt install cmake
# gcc (Ubuntu 9.3.0-17ubuntu120.04) 9.3.0
# g++ (Ubuntu 9.3.0-17ubuntu120.04) 9.3.0
apt install gcc g++
# doxygen 1.8.17 (complains about a missing dot - ignored)
apt install doxygen
# zlib 1.2.11
apt install zlib1g-dev
# lzma 5.2.4
apt install liblzma-dev
# lzo2 2.0.0
apt install liblzo2-dev
# png 16.37.0
apt install libpng-dev
# allegro 5.2.6
apt install liballegro4-dev
# freetype 6.17.1
apt install libfreetype-dev
# SDL2 2.0.10+dfsg1-3
apt install libsdl2-dev
# fluidsynth 2.3.1
apt install libfluidsynth-dev
# fontconfig 1.12.0
apt install libfontconfig1-dev
# ICU 66.1
apt install libicu-dev
# GRF 6.0.6-4build1
apt install grfcodec