python-install_prefix.patch

diff -urNp -x '*.orig' Python-2.7.18.org/Lib/distutils/command/install.py Python-2.7.18/Lib/distutils/command/install.py
--- Python-2.7.18.org/Lib/distutils/command/install.py	2021-09-26 12:34:36.324550580 +0200
+++ Python-2.7.18/Lib/distutils/command/install.py	2021-09-26 12:34:37.124559456 +0200
@@ -13,6 +13,8 @@ from types import *
 from distutils.core import Command
 from distutils.debug import DEBUG
 from distutils.sysconfig import get_config_vars
+from distutils.sysconfig import PREFIX, EXEC_PREFIX
+from distutils.sysconfig import SYS_PREFIX, SYS_EXEC_PREFIX
 from distutils.errors import DistutilsPlatformError
 from distutils.file_util import write_file
 from distutils.util import convert_path, subst_vars, change_root
@@ -306,9 +308,9 @@ class install (Command):
                             'py_version': py_version,
                             'py_version_short': py_version[0:3],
                             'py_version_nodot': py_version[0] + py_version[2],
-                            'sys_prefix': prefix,
+                            'sys_prefix': SYS_PREFIX,
                             'prefix': prefix,
-                            'sys_exec_prefix': exec_prefix,
+                            'sys_exec_prefix': SYS_EXEC_PREFIX,
                             'exec_prefix': exec_prefix,
                             'userbase': self.install_userbase,
                             'usersite': self.install_usersite,
@@ -428,8 +430,8 @@ class install (Command):
                     raise DistutilsOptionError, \
                           "must not supply exec-prefix without prefix"
 
-                self.prefix = os.path.normpath(sys.prefix)
-                self.exec_prefix = os.path.normpath(sys.exec_prefix)
+                self.prefix = PREFIX
+                self.exec_prefix = EXEC_PREFIX
 
             else:
                 if self.exec_prefix is None:
diff -urNp -x '*.orig' Python-2.7.18.org/Lib/distutils/sysconfig.py Python-2.7.18/Lib/distutils/sysconfig.py
--- Python-2.7.18.org/Lib/distutils/sysconfig.py	2021-09-26 12:34:36.324550580 +0200
+++ Python-2.7.18/Lib/distutils/sysconfig.py	2021-09-26 12:34:37.124559456 +0200
@@ -19,8 +19,10 @@ import sys
 from distutils.errors import DistutilsPlatformError
 
 # These are needed in a couple of spots, so just compute them once.
-PREFIX = os.path.normpath(sys.prefix)
-EXEC_PREFIX = os.path.normpath(sys.exec_prefix)
+SYS_PREFIX = os.path.normpath(sys.prefix)
+SYS_EXEC_PREFIX = os.path.normpath(sys.exec_prefix)
+PREFIX = "/usr/local" if SYS_PREFIX == "/usr" else SYS_PREFIX
+EXEC_PREFIX = "/usr/local" if SYS_EXEC_PREFIX == "/usr" else SYS_EXEC_PREFIX
 
 # Path to the base directory of the project. On Windows the binary may
 # live in project/PCBuild9.  If we're dealing with an x64 Windows build,
@@ -80,7 +82,7 @@ def get_python_inc(plat_specific=0, pref
     sys.exec_prefix -- i.e., ignore 'plat_specific'.
     """
     if prefix is None:
-        prefix = plat_specific and EXEC_PREFIX or PREFIX
+        prefix = plat_specific and SYS_EXEC_PREFIX or SYS_PREFIX
 
     if os.name == "posix":
         if python_build:
@@ -126,7 +128,10 @@ def get_python_lib(plat_specific=0, stan
     sys.exec_prefix -- i.e., ignore 'plat_specific'.
     """
     if prefix is None:
-        prefix = plat_specific and EXEC_PREFIX or PREFIX
+        if standard_lib:
+            prefix = plat_specific and SYS_EXEC_PREFIX or SYS_PREFIX
+        else:
+            prefix = plat_specific and EXEC_PREFIX or PREFIX
 
     if os.name == "posix":
         if plat_specific or standard_lib or prefix != "/usr":
diff -urNp -x '*.orig' Python-2.7.18.org/Lib/site.py Python-2.7.18/Lib/site.py
--- Python-2.7.18.org/Lib/site.py	2021-09-26 12:34:36.324550580 +0200
+++ Python-2.7.18/Lib/site.py	2021-09-26 12:34:37.124559456 +0200
@@ -64,7 +64,7 @@ import __builtin__
 import traceback
 
 # Prefixes for site-packages; add additional prefixes like /usr/local here
-PREFIXES = [sys.prefix, sys.exec_prefix]
+PREFIXES = ["/usr/local", sys.prefix, sys.exec_prefix]
 # Enable per user site-packages directory
 # set it to False to disable the feature or True to force the feature
 ENABLE_USER_SITE = None