Error when `graphviz` is not installed (macOS)

[seewoo5]

I got the following error because graphviz or pygraphviz was not installed previously. It would be great if it could be added as a requirement and installed automatically when pip install leanblueprint. I'm using M2 MacBook Air with Sonoma 14.5, and this answer helped me to install it.

Building wheels for collected packages: pygraphviz
  Building wheel for pygraphviz (pyproject.toml) ... error
  error: subprocess-exited-with-error
  
  × Building wheel for pygraphviz (pyproject.toml) did not run successfully.
  │ exit code: 1
  ╰─> [63 lines of output]
      running bdist_wheel
      running build
      running build_py
      creating build
      creating build/lib.macosx-14-arm64-cpython-310
      creating build/lib.macosx-14-arm64-cpython-310/pygraphviz
      copying pygraphviz/scraper.py -> build/lib.macosx-14-arm64-cpython-310/pygraphviz
      copying pygraphviz/graphviz.py -> build/lib.macosx-14-arm64-cpython-310/pygraphviz
      copying pygraphviz/__init__.py -> build/lib.macosx-14-arm64-cpython-310/pygraphviz
      copying pygraphviz/agraph.py -> build/lib.macosx-14-arm64-cpython-310/pygraphviz
      copying pygraphviz/testing.py -> build/lib.macosx-14-arm64-cpython-310/pygraphviz
      creating build/lib.macosx-14-arm64-cpython-310/pygraphviz/tests
      copying pygraphviz/tests/test_unicode.py -> build/lib.macosx-14-arm64-cpython-310/pygraphviz/tests
      copying pygraphviz/tests/test_scraper.py -> build/lib.macosx-14-arm64-cpython-310/pygraphviz/tests
      copying pygraphviz/tests/test_readwrite.py -> build/lib.macosx-14-arm64-cpython-310/pygraphviz/tests
      copying pygraphviz/tests/test_string.py -> build/lib.macosx-14-arm64-cpython-310/pygraphviz/tests
      copying pygraphviz/tests/__init__.py -> build/lib.macosx-14-arm64-cpython-310/pygraphviz/tests
      copying pygraphviz/tests/test_html.py -> build/lib.macosx-14-arm64-cpython-310/pygraphviz/tests
      copying pygraphviz/tests/test_node_attributes.py -> build/lib.macosx-14-arm64-cpython-310/pygraphviz/tests
      copying pygraphviz/tests/test_drawing.py -> build/lib.macosx-14-arm64-cpython-310/pygraphviz/tests
      copying pygraphviz/tests/test_repr_mimebundle.py -> build/lib.macosx-14-arm64-cpython-310/pygraphviz/tests
      copying pygraphviz/tests/test_subgraph.py -> build/lib.macosx-14-arm64-cpython-310/pygraphviz/tests
      copying pygraphviz/tests/test_close.py -> build/lib.macosx-14-arm64-cpython-310/pygraphviz/tests
      copying pygraphviz/tests/test_edge_attributes.py -> build/lib.macosx-14-arm64-cpython-310/pygraphviz/tests
      copying pygraphviz/tests/test_clear.py -> build/lib.macosx-14-arm64-cpython-310/pygraphviz/tests
      copying pygraphviz/tests/test_layout.py -> build/lib.macosx-14-arm64-cpython-310/pygraphviz/tests
      copying pygraphviz/tests/test_attribute_defaults.py -> build/lib.macosx-14-arm64-cpython-310/pygraphviz/tests
      copying pygraphviz/tests/test_graph.py -> build/lib.macosx-14-arm64-cpython-310/pygraphviz/tests
      running egg_info
      writing pygraphviz.egg-info/PKG-INFO
      writing dependency_links to pygraphviz.egg-info/dependency_links.txt
      writing top-level names to pygraphviz.egg-info/top_level.txt
      reading manifest file 'pygraphviz.egg-info/SOURCES.txt'
      reading manifest template 'MANIFEST.in'
      warning: no files found matching '*.swg'
      warning: no files found matching '*.png' under directory 'doc'
      warning: no files found matching '*.html' under directory 'doc'
      warning: no files found matching '*.txt' under directory 'doc'
      warning: no files found matching '*.css' under directory 'doc'
      warning: no previously-included files matching '*~' found anywhere in distribution
      warning: no previously-included files matching '*.pyc' found anywhere in distribution
      warning: no previously-included files matching '.svn' found anywhere in distribution
      no previously-included directories found matching 'doc/build'
      adding license file 'LICENSE'
      writing manifest file 'pygraphviz.egg-info/SOURCES.txt'
      copying pygraphviz/graphviz.i -> build/lib.macosx-14-arm64-cpython-310/pygraphviz
      copying pygraphviz/graphviz_wrap.c -> build/lib.macosx-14-arm64-cpython-310/pygraphviz
      running build_ext
      building 'pygraphviz._graphviz' extension
      creating build/temp.macosx-14-arm64-cpython-310
      creating build/temp.macosx-14-arm64-cpython-310/pygraphviz
      clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX14.sdk -I/opt/homebrew/opt/llvm/include -DSWIG_PYTHON_STRICT_BYTE_CHAR -I/opt/homebrew/opt/python@3.10/Frameworks/Python.framework/Versions/3.10/include/python3.10 -c pygraphviz/graphviz_wrap.c -o build/temp.macosx-14-arm64-cpython-310/pygraphviz/graphviz_wrap.o
      pygraphviz/graphviz_wrap.c:9:9: warning: 'SWIG_PYTHON_STRICT_BYTE_CHAR' macro redefined [-Wmacro-redefined]
      #define SWIG_PYTHON_STRICT_BYTE_CHAR
              ^
      <command line>:2:9: note: previous definition is here
      #define SWIG_PYTHON_STRICT_BYTE_CHAR 1
              ^
      pygraphviz/graphviz_wrap.c:3023:10: fatal error: 'graphviz/cgraph.h' file not found
      #include "graphviz/cgraph.h"
               ^~~~~~~~~~~~~~~~~~~
      1 warning and 1 error generated.
      error: command '/usr/bin/clang' failed with exit code 1
      [end of output]
  
  note: This error originates from a subprocess, and is likely not a problem with pip.
  ERROR: Failed building wheel for pygraphviz
Failed to build pygraphviz
ERROR: ERROR: Failed to build installable wheels for some pyproject.toml based projects (pygraphviz)