In the unix variant (& hence the Mac variant), there are many environment variables that can specify such things as
SQUEAK_PLUGINS
SQUEAK_ENCODING
SQUEAK_PATHENC
SQUEAK_TEXTENC
SQUEAK_VM
First these should be dialect-specific (PHARO_PLUGINS CUIS_PLUGINS NEWSPEAK_PLUGINS etc), and for backward-compatibility the Squeak specific names should remain functional. So all VM environment variable access should be though a routine, somewhat like

if ((ev = getvmenvvar("PLUGINS"))) squeakPlugins = strdup(ev);

where getvmenvvar is something like

char *
getvmenvvar(const char *var)
{
char varname[64];
char *value;
#if PHARO_VM

define VM_VAR_PREFIX "PHARO_"

#elif CUIS_VM

define VM_VAR_PREFIX "CUIS_"

#elif NEWSPEAK_VM

define VM_VAR_PREFIX "NEWSPEAK_"

#endif
#if defined(VM_VAR_PREFIX)
strcpy(varname,VM_VAR_PREFIX);
strcat(varname,var);
if ((value = getenv(varname))
return value;
#endif
/* now the default prefix */
strcpy(varname,"SQUEAK_");
strcat(varname,var);
return getenv(varname);
}

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