build/bin/sage-pip-install: Use SYSTEM_VERSION_COMPAT=0

Author: Matthias Koeppe

build/bin/sage-pip-install

@@ -30,6 +30,11 @@ PIP=pip3
 # running pip. This is implemented in the Python script sage-flock
 LOCK="$SAGE_LOCAL/var/lock/$PIP.lock"
 
+# Trac #33155: Pythons installed using the python.org macOS installers
+# for Python < 3.10 identify macOS Big Sur and newer as "10.16", causing
+# pip to refuse to install wheels tagged macosx_11_0_x86_64
+export SYSTEM_VERSION_COMPAT=0
+
 # Finally actually do the installation (the "SHARED" tells pip2/3-lock
 # to apply a shared lock)
 sage-flock -s $LOCK $PYTHON -m pip install $pip_install_flags "$@"