asciidoctor-mathematical does not install on Big Sur

[elisa-riscv]

I am copying Terminal output from several lines before the warning messages begin.

After upgrading to Big Sur and upgrading the command line tools to the latest version, I checked all of the dependencies for asciidoctor-mathematical.

It appears that there is a dependency on glib-2.0 but why?

...
-- Performing Test COMPILER_HAS_DEPRECATED_ATTR - Success
-- Found PythonInterp: /usr/bin/python (found version "2.7.16")
-- Configuring done
-- Generating done
-- Build files have been written to: /Users/storycraft/.rvm/gems/ruby-2.7.2/gems/mathematical-1.6.14/ext/mathematical/mtex2MML/build
[ 10%] [BISON][MTEX2MMLPARSER] Building parser with bison 2.3
conflicts: 5280 shift/reduce, 613 reduce/reduce
[ 20%] [FLEX][MTEX2MMLSCANNER] Building scanner with flex 2.6.4
[ 30%] Building C object CMakeFiles/libmtex2MML_static.dir/src/colors.c.o
[ 40%] Building C object CMakeFiles/libmtex2MML_static.dir/src/em.c.o
[ 50%] Building C object CMakeFiles/libmtex2MML_static.dir/src/environment.c.o
[ 60%] Building C object CMakeFiles/libmtex2MML_static.dir/src/string_dup.c.o
[ 70%] Building C object CMakeFiles/libmtex2MML_static.dir/src/string_extras.c.o
[ 80%] Building C object CMakeFiles/libmtex2MML_static.dir/parser.c.o
/Users/storycraft/.rvm/gems/ruby-2.7.2/gems/mathematical-1.6.14/ext/mathematical/mtex2MML/src/parser.y:56:30: warning: unused parameter 'ret_str' [-Wunused-parameter]
static void yyerror (char **ret_str, const char * s)
^
/Users/storycraft/.rvm/gems/ruby-2.7.2/gems/mathematical-1.6.14/ext/mathematical/mtex2MML/src/parser.y:3507:12: warning: cast to smaller integer type 'encaseType' from 'encaseType *' [-Wpointer-to-enum-cast]
encase = (encaseType) encase_pointer;
^~~~~~~~~~~~~~~~~~~~~~~~~~~
/Users/storycraft/.rvm/gems/ruby-2.7.2/gems/mathematical-1.6.14/ext/mathematical/mtex2MML/src/parser.y:68:14: warning: unused function 'mtex2MML_default_write' [-Wunused-function]
static void mtex2MML_default_write (const char * buffer, unsigned long length)
^
/Users/storycraft/.rvm/gems/ruby-2.7.2/gems/mathematical-1.6.14/ext/mathematical/mtex2MML/src/parser.y:79:14: warning: unused function 'mtex2MML_default_write_mathml' [-Wunused-function]
static void mtex2MML_default_write_mathml (const char * mathml)
^
4 warnings generated.
[ 90%] Building C object CMakeFiles/libmtex2MML_static.dir/lexer.c.o
/Users/storycraft/.rvm/gems/ruby-2.7.2/gems/mathematical-1.6.14/ext/mathematical/mtex2MML/build/lexer.c:8455:16: warning: function 'input' is not needed and will not be emitted [-Wunneeded-internal-declaration]
static int input (void)
^
1 warning generated.
[100%] Linking C static library libmtex2MML.a
[100%] Built target libmtex2MML_static
-- The C compiler identification is AppleClang 12.0.5.12050022
-- The CXX compiler identification is AppleClang 12.0.5.12050022
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /Library/Developer/CommandLineTools/usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /Library/Developer/CommandLineTools/usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
CMake Deprecation Warning at CMakeLists.txt:8 (cmake_minimum_required):
Compatibility with CMake < 2.8.12 will be removed from a future version of
CMake.

Update the VERSION argument value or use a ... suffix to tell
CMake that the project does not need compatibility with older versions.

-- Found PkgConfig: /opt/local/bin/pkg-config (found version "0.29.1")
-- Checking for module 'glib-2.0'
-- No package 'glib-2.0' found
CMake Error at /Applications/CMake.app/Contents/share/cmake-3.20/Modules/FindPkgConfig.cmake:556 (message):
A required package was not found
Call Stack (most recent call first):
/Applications/CMake.app/Contents/share/cmake-3.20/Modules/FindPkgConfig.cmake:778 (_pkg_check_modules_internal)
CMakeLists.txt:41 (pkg_check_modules)

-- Configuring incomplete, errors occurred!
See also "/Users/storycraft/.rvm/gems/ruby-2.7.2/gems/mathematical-1.6.14/ext/mathematical/lasem/build/CMakeFiles/CMakeOutput.log".
See also "/Users/storycraft/.rvm/gems/ruby-2.7.2/gems/mathematical-1.6.14/ext/mathematical/lasem/build/CMakeFiles/CMakeError.log".
make: *** No targets specified and no makefile found. Stop.
*** 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
--with-opt-include
--without-opt-include=${opt-dir}/include
--with-opt-lib
--without-opt-lib=${opt-dir}/lib
--with-make-prog
--without-make-prog
--srcdir=.
--curdir
--ruby=/Users/storycraft/.rvm/rubies/ruby-2.7.2/bin/$(RUBY_BASE_NAME)
--with-xml2-dir
--without-xml2-dir
--with-xml2-include
--without-xml2-include=${xml2-dir}/include
--with-xml2-lib
--without-xml2-lib=${xml2-dir}/lib
--with-xml2lib
--without-xml2lib
--with-pangocairo-1.0-dir
--without-pangocairo-1.0-dir
--with-pangocairo-1.0-include
--without-pangocairo-1.0-include=${pangocairo-1.0-dir}/include
--with-pangocairo-1.0-lib
--without-pangocairo-1.0-lib=${pangocairo-1.0-dir}/lib
--with-pangocairo-1.0lib
--without-pangocairo-1.0lib
--use-system-mtex2MML
--use-system-lasem
/Users/storycraft/.rvm/rubies/ruby-2.7.2/lib/ruby/2.7.0/fileutils.rb:491:in realpath': No such file or directory @ rb_check_realpath_internal - /Users/storycraft/.rvm/gems/ruby-2.7.2/gems/mathematical-1.6.14/ext/mathematical/lasem/build/liblasem.dylib (Errno::ENOENT) from /Users/storycraft/.rvm/rubies/ruby-2.7.2/lib/ruby/2.7.0/fileutils.rb:491:in copy_entry'
from /Users/storycraft/.rvm/rubies/ruby-2.7.2/lib/ruby/2.7.0/fileutils.rb:468:in block in cp_r' from /Users/storycraft/.rvm/rubies/ruby-2.7.2/lib/ruby/2.7.0/fileutils.rb:1589:in block in fu_each_src_dest'
from /Users/storycraft/.rvm/rubies/ruby-2.7.2/lib/ruby/2.7.0/fileutils.rb:1603:in fu_each_src_dest0' from /Users/storycraft/.rvm/rubies/ruby-2.7.2/lib/ruby/2.7.0/fileutils.rb:1587:in fu_each_src_dest'
from /Users/storycraft/.rvm/rubies/ruby-2.7.2/lib/ruby/2.7.0/fileutils.rb:467:in cp_r' from extconf.rb:99:in

'

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

/Users/storycraft/.rvm/gems/ruby-2.7.2/extensions/x86_64-darwin-18/2.7.0/mathematical-1.6.14/mkmf.log

extconf failed, exit code 1

Gem files will remain installed in /Users/storycraft/.rvm/gems/ruby-2.7.2/gems/mathematical-1.6.14 for inspection.
Results logged to /Users/storycraft/.rvm/gems/ruby-2.7.2/extensions/x86_64-darwin-18/2.7.0/mathematical-1.6.14/gem_make.out