The directives in the ContextGarden for working with the minimals in TeXShop are not working for me on MacOSX.

I installed the minimals in ~/TeX/context/beta and then set the TeXShop engine script to:
export TEXROOT="~/TeX/context/beta/tex"
export PATH=$TEXROOT/texmf-osx-ppc/bin:$PATH
export TEXMFCACHE="$TEXROOT/texmf-cache"
context "$1"
This corresponds to the recipe step 3 of "TeXShop installation and configuration".

The result in TeXShop's console window is disappointing:
MTXrun | unknown script 'context.lua' or 'mtx-context.lua'

Prefixing to the engine script with the recommended:
~/TeX/context/beta/tex/setuptex
does not help.
In fact $TEXROOT appears not to have been set, witnessed by the following output:

Setting "/Users/hans/TeX/context/beta/tex" as TEXROOT.
TEXROOT after ~/TeX/context/beta/tex/setuptex = 
MTXrun | unknown script 'context.lua' or 'mtx-context.lua'

What now?

Hans van der Meer