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A simple string that does not contain white space may be left
unquoted. The string must not contain any of the characters special to
the definition text (i.e. ", #, ', (,
), ,, ;, <, =, >, [,
], `, {, or }). This list is subject to
change, but it will never contain underscore (_), period
(.), slash (/), colon (:), hyphen (-) or
backslash (\\). Basically, if the string looks like it is a
normal DOS or UNIX file or variable name, and it is not one of two
keywords (`autogen' or `definitions') then it is OK to not
quote it, otherwise you should.