$ spack install intel-mkl
$ spack load intel-mkl

$ spack load intel-mkl
==> Warning: Quotes in command arguments can confuse scripts like configure.
  The following arguments may cause problems when executed:
      source /dev/null &> /dev/null && python3 -c "import os, json; print(json.dumps(dict(os.environ)))"
  Quotes aren't needed because spack doesn't use a shell.
  Consider removing them
==> Warning: Quotes in command arguments can confuse scripts like configure.
  The following arguments may cause problems when executed:
      source /opt/intel/compilers_and_libraries_2020.0.166/mac/mkl/bin/mklvars.sh intel64 &> /dev/null && python3 -c "import os, json; print(json.dumps(dict(os.environ)))"
  Quotes aren't needed because spack doesn't use a shell.
  Consider removing them

$ spack -d load intel-mkl
==> [2021-04-03-12:58:51.404517] Imported load from built-in commands
==> [2021-04-03-12:58:51.406030] Imported load from built-in commands
==> [2021-04-03-12:58:51.408626] Reading config file /Users/Adam/spack/etc/spack/defaults/config.yaml
==> [2021-04-03-12:58:51.445309] Reading config file /Users/Adam/.spack/config.yaml
==> [2021-04-03-12:58:51.448786] DATABASE LOCK TIMEOUT: 3s
==> [2021-04-03-12:58:51.448919] PACKAGE LOCK TIMEOUT: No timeout
==> [2021-04-03-12:58:51.697714] Reading config file /Users/Adam/spack/etc/spack/defaults/repos.yaml
==> [2021-04-03-12:58:54.283298] Reading config file /Users/Adam/spack/etc/spack/defaults/modules.yaml
==> [2021-04-03-12:58:54.300375] Reading config file /Users/Adam/spack/etc/spack/defaults/darwin/modules.yaml
==> [2021-04-03-12:58:54.306236] Reading config file /Users/Adam/.spack/modules.yaml
==> [2021-04-03-12:58:54.552076] Reading config file /Users/Adam/.spack/darwin/compilers.yaml
==> [2021-04-03-12:58:54.582045] normalize_path.normalize_suite_dir:	trying /opt/intel/compilers_and_libraries_2020.0.166
==> [2021-04-03-12:58:54.583319] normalize_path.normalize_suite_dir:	found 1:
  ['/opt/intel/compilers_and_libraries_2020.0.166']
==> [2021-04-03-12:58:54.584315] normalize_path.normalize_suite_dir:	/opt/intel/compilers_and_libraries_2020.0.166
==> [2021-04-03-12:58:54.585610] file_to_source.normalize_path:	/opt/intel/compilers_and_libraries_2020.0.166/mac/mkl/bin/mklvars.sh
==> [2021-04-03-12:58:54.585712] sourcing /opt/intel/compilers_and_libraries_2020.0.166/mac/mkl/bin/mklvars.sh
==> [2021-04-03-12:58:54.587316] Warning: Quotes in command arguments can confuse scripts like configure.
  The following arguments may cause problems when executed:
      source /dev/null &> /dev/null && python3 -c "import os, json; print(json.dumps(dict(os.environ)))"
  Quotes aren't needed because spack doesn't use a shell.
  Consider removing them
==> [2021-04-03-12:58:54.587617] '/bin/bash' '-c' 'source /dev/null &> /dev/null && python3 -c "import os, json; print(json.dumps(dict(os.environ)))"'
==> [2021-04-03-12:58:54.742466] Warning: Quotes in command arguments can confuse scripts like configure.
  The following arguments may cause problems when executed:
      source /opt/intel/compilers_and_libraries_2020.0.166/mac/mkl/bin/mklvars.sh intel64 &> /dev/null && python3 -c "import os, json; print(json.dumps(dict(os.environ)))"
  Quotes aren't needed because spack doesn't use a shell.
  Consider removing them
==> [2021-04-03-12:58:54.742856] '/bin/bash' '-c' 'source /opt/intel/compilers_and_libraries_2020.0.166/mac/mkl/bin/mklvars.sh intel64 &> /dev/null && python3 -c "import os, json; print(json.dumps(dict(os.environ)))"'
==> [2021-04-03-12:58:55.186467] '/Users/Adam/spack/opt/spack/darwin-catalina-x86_64/apple-clang-12.0.0/python-3.8.8-hb53qjrjzg2glssozy2xoppjczwuh2bs/bin/python3.8' '-c' 'from distutils.sysconfig import get_config_h_filename; print(get_config_h_filename())'
==> [2021-04-03-12:58:55.371812] '/Users/Adam/spack/opt/spack/darwin-catalina-x86_64/apple-clang-12.0.0/python-3.8.8-hb53qjrjzg2glssozy2xoppjczwuh2bs/bin/python3.8' '-c' 'from distutils.sysconfig import get_config_var; print(get_config_var('"'"'prefix'"'"'))'

$ '/bin/bash' '-c' 'source /opt/intel/compilers_and_libraries_2020.0.166/mac/mkl/bin/mklvars.sh intel64 &> /dev/null && python3 -c "import os, json; print(json.dumps(dict(os.environ)))"'