Install wxwidgets in a way Elixir/Erlang's :observer can use

fix_wxwidgets.sh

# If you're here, I assume it's because you tried to run
# :observer for the first time on your Mac and discovered
# it won't work because of some obscure issue with wxwidgets
# (formerly known to Homebrew as wxmac).
#
# This script will fix it for you.

# 1. Remove the old and busted copy
brew uninstall wxwidgets --ignore-dependencies 

# 2. Grab the path at which the Homebrew *formula* lives
formula_path="$(brew edit wxwidgets --print-path)"

# 3. Modify the compilation arguments list in the formula
#    to add the --enable-compat28 flag.
#    This flag is what Erlang's :observer needs.
#    This will store the complete, edited text of the
#    in fixed_formula.
fixed_formula=$(sed 's/args = \[/args = \["--enable-compat28",/' "$formula_path")

# 4. Write the corrected formula back to the path Homebrew
#    will read it from.
echo "$fixed_formula" > "$formula_path"

# 5. Build it from source with the corrected formula.
brew install wxwidgets --build-from-source

# 6. Suggest next steps
echo "WARNING: While wxwidgets should now be fixed, you"
echo "         will still need to reinstall Erlang."