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diff --git a/build/moz.configure/init.configure b/build/moz.configure/init.configure
index 855214a..1e91d51 100644
--- build/moz.configure/init.configure
+++ build/moz.configure/init.configure
@@ -252,6 +252,7 @@ option(env='PYTHON3', nargs=1, help='Python 3 interpre
@imports(_from='mozbuild.pythonutil', _import='find_python3_executable')
@imports(_from='mozbuild.pythonutil', _import='python_executable_version')
@imports(_from='six', _import='ensure_text')
+@imports(_from='__builtin__', _import='KeyError')
def virtualenv_python3(env_python, build_env, mozconfig, help):
# Avoid re-executing python when running configure --help.
if help:
@@ -284,6 +285,12 @@ def virtualenv_python3(env_python, build_env, mozconfi
python = mozconfig['vars']['added']['PYTHON3']
elif 'PYTHON3' in mozconfig['vars']['modified']:
python = mozconfig['vars']['modified']['PYTHON3'][1]
+ for i in ('env', 'vars'):
+ for j in ('added', 'modified'):
+ try:
+ del mozconfig[i][j]['PYTHON3']
+ except KeyError:
+ pass
log.debug("python3: executable from configuration: %r" % python)
@@ -373,7 +380,10 @@ def virtualenv_python3(env_python, build_env, mozconfi
sys.executable, manager.python_path))
log.info('Re-executing in the virtualenv')
if env_python:
- del os.environ['PYTHON3']
+ try:
+ del os.environ['PYTHON3']
+ except KeyError:
+ pass
# Homebrew on macOS will change Python's sys.executable to a custom
# value which messes with mach's virtualenv handling code. Override
# Homebrew's changes with the correct sys.executable value.
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