diff -Nru Python-3.8.2/Lib/site.py Python-3.8.2-new/Lib/site.py
--- Python-3.8.2/Lib/site.py	2020-02-24 22:36:25.000000000 +0100
+++ Python-3.8.2-new/Lib/site.py	2020-05-01 17:10:43.000000000 +0200
@@ -458,9 +458,8 @@
 
     env = os.environ
     if sys.platform == 'darwin' and '__PYVENV_LAUNCHER__' in env:
-        executable = sys._base_executable = os.environ['__PYVENV_LAUNCHER__']
-    else:
-        executable = sys.executable
+        print("Ignoring __PYVENV_LAUNCHER__")
+    executable = sys.executable
     exe_dir, _ = os.path.split(os.path.abspath(executable))
     site_prefix = os.path.dirname(exe_dir)
     sys._home = None
@@ -487,7 +486,8 @@
                     if key == 'include-system-site-packages':
                         system_site = value.lower()
                     elif key == 'home':
-                        sys._home = value
+                        # this is breaking pyconfig.h path detection with venv
+                        print('Ignoring "sys._home = value" override')
 
         sys.prefix = sys.exec_prefix = site_prefix