- Issue #17219: Add library build dir for Python extension cross-builds.

Lib/distutils/command/build_ext.py

@@ -244,7 +244,7 @@ class build_ext(Command):
         # Python's library directory must be appended to library_dirs
         # See Issues: #1600860, #4366
         if (sysconfig.get_config_var('Py_ENABLE_SHARED')):
-            if sys.executable.startswith(os.path.join(sys.exec_prefix, "bin")):
+            if not sysconfig.python_build:
                 # building third party extensions
                 self.library_dirs.append(sysconfig.get_config_var('LIBDIR'))
             else:

Misc/NEWS

@@ -1060,6 +1060,8 @@ Build
 
 - Issue #18096: Fix library order returned by python-config.
 
+- Issue #17219: Add library build dir for Python extension cross-builds.
+
 C API
 -----