Fixes for the Odoo installation from source on macOS

odoo_installation_flags.sh

# General
xcode-select --install

# 2to3 error; python_version < "3.8"
pip install setuptools <=57.5.0

# Pillow
brew install libjpeg
brew install zlib
export LDFLAGS="-L/usr/local/opt/zlib/lib"
export CFLAGS="-I/usr/local/opt/zlib/include"

# Pyldap
pip install python-ldap \
   --global-option=build_ext \
   --global-option="-I$(xcrun --show-sdk-path)/usr/include/sasl"

# reportlab
export CFLAGS="-Wno-error=implicit-function-declaration"

# psycopg2
export LDFLAGS="-L/usr/local/Cellar/openssl@1.1/1.1.1h/lib"