--- setupext.py.orig	2023-09-15 21:51:51
+++ setupext.py	2023-09-15 21:56:33
@@ -401,6 +401,7 @@
                 "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
@@ -421,6 +422,7 @@
             ])
         FreeType.add_flags(ext)
         add_numpy_flags(ext)
+        add_macports_flags(ext)
         add_libagg_flags(ext)
         yield ext
         # image
@@ -430,6 +432,7 @@
                 "src/py_converters.cpp",
             ])
         add_numpy_flags(ext)
+        add_macports_flags(ext)
         add_libagg_flags_and_sources(ext)
         yield ext
         # path
@@ -439,6 +442,7 @@
                 "src/_path_wrapper.cpp",
             ])
         add_numpy_flags(ext)
+        add_macports_flags(ext)
         add_libagg_flags_and_sources(ext)
         yield ext
         # qhull
@@ -446,6 +450,7 @@
             "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
@@ -459,6 +464,7 @@
                        "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
@@ -505,6 +511,12 @@
                                   'mplot3d/tests/baseline_images'),
             ]
         }
+
+
+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):