Re: 1-tvh-autoconf-2.50.diff

[Tim Van Holder]

> +## Make sure CDPATH assignments take Zsh into account
> +     @if grep -n '^[^#]*CDPATH' $(srcdir)/lib/am/*.am | \
> +           fgrep -v 'CDPATH=$$$${ZSH_VERSION+.}:'; then \

Almost forgot: This should be 

  ... 'CDPATH=$$$${ZSH_VERSION+.}$(PATH_SEPARATOR)'

so it will also work on DOSish systems.
The same goes for the other instances of CDPATH in your
patch.