--- setupext.py.orig	2023-02-22 11:42:35
+++ setupext.py	2024-01-10 14:48:42
@@ -399,6 +399,7 @@
                 "src/_backend_agg_wrapper.cpp",
             ])
         add_numpy_flags(ext)
+        add_macports_flags(ext)
         add_libagg_flags_and_sources(ext)
         FreeType.add_flags(ext)
         yield ext
@@ -409,6 +410,7 @@
                 "linux": ["dl"],
                 "win32": ["ole32", "shell32", "user32"],
             }.get(sys.platform, [])))
+        add_macports_flags(ext)
         yield ext
         # ft2font
         ext = Extension(
@@ -419,6 +421,7 @@
             ])
         FreeType.add_flags(ext)
         add_numpy_flags(ext)
+        add_macports_flags(ext)
         add_libagg_flags(ext)
         yield ext
         # image
@@ -428,6 +431,7 @@
                 "src/py_converters.cpp",
             ])
         add_numpy_flags(ext)
+        add_macports_flags(ext)
         add_libagg_flags_and_sources(ext)
         yield ext
         # path
@@ -437,6 +441,7 @@
                 "src/_path_wrapper.cpp",
             ])
         add_numpy_flags(ext)
+        add_macports_flags(ext)
         add_libagg_flags_and_sources(ext)
         yield ext
         # qhull
@@ -444,6 +449,7 @@
             "matplotlib._qhull", ["src/_qhull_wrapper.cpp"],
             define_macros=[("MPL_DEVNULL", os.devnull)])
         add_numpy_flags(ext)
+        add_macports_flags(ext)
         Qhull.add_flags(ext)
         yield ext
         # tkagg
@@ -457,6 +463,7 @@
                        "cygwin": ["comctl32", "psapi"]}.get(sys.platform, []),
             extra_link_args={"win32": ["-mwindows"]}.get(sys.platform, []))
         add_numpy_flags(ext)
+        add_macports_flags(ext)
         add_libagg_flags(ext)
         yield ext
         # tri
@@ -466,6 +473,7 @@
                 "src/tri/_tri_wrapper.cpp",
             ],
             cxx_std=11)
+        add_macports_flags(ext)
         yield ext
         # ttconv
         ext = Extension(
@@ -477,6 +485,7 @@
             ],
             include_dirs=["extern"])
         add_numpy_flags(ext)
+        add_macports_flags(ext)
         yield ext
 
 
@@ -504,6 +513,11 @@
             ]
         }
 
+
+def add_macports_flags(ext):
+    mp_cxxflags = os.getenv('CXXFLAGS').split()
+    print(f"MacPorts CXXFLAGS = {mp_cxxflags}")
+    ext.extra_compile_args.extend(mp_cxxflags)
 
 def add_numpy_flags(ext):
     import numpy as np
@@ -796,8 +810,8 @@
             'matplotlib.backends._macosx', [
                 'src/_macosx.m'
             ])
-        ext.extra_compile_args.extend(['-Werror'])
         ext.extra_link_args.extend(['-framework', 'Cocoa'])
         if platform.python_implementation().lower() == 'pypy':
             ext.extra_compile_args.append('-DPYPY=1')
+        add_macports_flags(ext)
         yield ext