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(emacs)Mac Environment Variables

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Environment Variables and Command Line Arguments.
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   Environment variables and command line arguments for Emacs can be set
by modifying the `STR#' resources 128 and 129, respectively.  A common
environment variable that one may want to set is `HOME'.

   The way to set an environment variable is by adding a string of the
form

     ENV_VAR=VALUE

to resource `STR#' number 128 using `ResEdit'. To set up the program to
use unibyte characters exclusively, for example, add the string

     EMACS_UNIBYTE=1