Support pkg-config #39

Installing ruby-lua 0.6.0 with native extensions
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

    current directory: /Users/human/.asdf/installs/ruby/2.6.8/lib/ruby/gems/2.6.0/gems/ruby-lua-0.6.0/ext
/Users/human/.asdf/installs/ruby/2.6.8/bin/ruby -I /Users/human/.asdf/installs/ruby/2.6.8/lib/ruby/2.6.0 -r ./siteconf20240706-11547-1pxuoc6.rb extconf.rb
checking for lua-config... no
checking for pkg-config... yes
Package lua was not found in the pkg-config search path.
Perhaps you should add the directory containing `lua.pc'
to the PKG_CONFIG_PATH environment variable
No package 'lua' found
Package lua was not found in the pkg-config search path.
Perhaps you should add the directory containing `lua.pc'
to the PKG_CONFIG_PATH environment variable
No package 'lua' found
Package lua5.1 was not found in the pkg-config search path.
Perhaps you should add the directory containing `lua5.1.pc'
to the PKG_CONFIG_PATH environment variable
No package 'lua5.1' found
Package lua5.1 was not found in the pkg-config search path.
Perhaps you should add the directory containing `lua5.1.pc'
to the PKG_CONFIG_PATH environment variable
No package 'lua5.1' found
Package lua5.2 was not found in the pkg-config search path.
Perhaps you should add the directory containing `lua5.2.pc'
to the PKG_CONFIG_PATH environment variable
No package 'lua5.2' found
Package lua5.2 was not found in the pkg-config search path.
Perhaps you should add the directory containing `lua5.2.pc'
to the PKG_CONFIG_PATH environment variable
No package 'lua5.2' found
Package lua5.3 was not found in the pkg-config search path.
Perhaps you should add the directory containing `lua5.3.pc'
to the PKG_CONFIG_PATH environment variable
No package 'lua5.3' found
Package lua5.3 was not found in the pkg-config search path.
Perhaps you should add the directory containing `lua5.3.pc'
to the PKG_CONFIG_PATH environment variable
No package 'lua5.3' found
checking for lua.h... no
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers.  Check the mkmf.log file for more details.  You may
need configuration options.

Provided configuration options:
	--with-opt-dir
	--without-opt-dir
	--with-opt-include
	--without-opt-include=${opt-dir}/include
	--with-opt-lib
	--without-opt-lib=${opt-dir}/lib
	--with-lua50-dir
	--without-lua50-dir
	--with-lua50-include
	--without-lua50-include=${lua50-dir}/include
	--with-lua50-lib
	--without-lua50-lib=${lua50-dir}/lib
	--with-lua-dir
	--without-lua-dir
	--with-lua-include
	--without-lua-include=${lua-dir}/include
	--with-lua-lib
	--without-lua-lib=${lua-dir}/lib
	--with-lua51-dir
	--without-lua51-dir
	--with-lua51-include
	--without-lua51-include=${lua51-dir}/include
	--with-lua51-lib
	--without-lua51-lib=${lua51-dir}/lib
	--with-lua52-dir
	--without-lua52-dir
	--with-lua52-include
	--without-lua52-include=${lua52-dir}/include
	--with-lua52-lib
	--without-lua52-lib=${lua52-dir}/lib
	--with-lua53-dir
	--without-lua53-dir
	--with-lua53-include
	--without-lua53-include=${lua53-dir}/include
	--with-lua53-lib
	--without-lua53-lib=${lua53-dir}/lib
 extconf failure: need liblua50 (headers not found)

        Install the library or try one of the following options to extconf.rb:

        --with-lua-lib=/path/to/liblua/lib
        --with-lua-include=/path/to/liblua/include
    or
        --with-lua50-lib=/path/to/liblua/lib
        --with-lua50-include=/path/to/liblua/include


To see why this extension failed to compile, please check the mkmf.log which can be found here:

  /Users/human/.asdf/installs/ruby/2.6.8/lib/ruby/gems/2.6.0/extensions/arm64-darwin-23/2.6.0/ruby-lua-0.6.0/mkmf.log

extconf failed, exit code 1