$ gem install fontconfig
Fetching fontconfig-0.0.2.gem
Fetching pkg-config-1.5.1.gem
Successfully installed pkg-config-1.5.1
Building native extensions. This could take a while...
ERROR: Error installing fontconfig:
ERROR: Failed to build gem native extension.
current directory: /home/brodock/.rvm/gems/ruby-3.2.1/gems/fontconfig-0.0.2/ext/fontconfig
/home/brodock/.rvm/rubies/ruby-3.2.1/bin/ruby -I /home/brodock/.rvm/rubies/ruby-3.2.1/lib/ruby/3.2.0 extconf.rb
checking for fontconfig... no
creating Makefile
current directory: /home/brodock/.rvm/gems/ruby-3.2.1/gems/fontconfig-0.0.2/ext/fontconfig
make DESTDIR\= sitearchdir\=./.gem.20230318-32319-rt3emn sitelibdir\=./.gem.20230318-32319-rt3emn clean
current directory: /home/brodock/.rvm/gems/ruby-3.2.1/gems/fontconfig-0.0.2/ext/fontconfig
make DESTDIR\= sitearchdir\=./.gem.20230318-32319-rt3emn sitelibdir\=./.gem.20230318-32319-rt3emn
compiling fc_config.c
In file included from fc_config.c:1:
rb_fontconfig.h:2:10: fatal error: fontconfig/fontconfig.h: Arquivo ou diretório inexistente
2 | #include <fontconfig/fontconfig.h>
| ^~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
make: *** [Makefile:248: fc_config.o] Erro 1
make failed, exit code 2
Gem files will remain installed in /home/brodock/.rvm/gems/ruby-3.2.1/gems/fontconfig-0.0.2 for inspection.
Results logged to /home/brodock/.rvm/gems/ruby-3.2.1/extensions/x86_64-linux/3.2.0/fontconfig-0.0.2/gem_make.out