Use FvwmM4 module to avoid creating env vars. Use -m4-prefix -m4-prefix-defines options to avoid name conflict and prevent from substitution of built-in defines (like FVWM_USERDIR).

# -*- mode: sh -*-

if [[ -f $HOME/.bashrc ]]; then
  . $HOME/.bashrc
fi

# TIP: MC command start with space.
export HISTIGNORE=$HISTIGNORE:" *"