Descriptive text for the C preprocessor macros that
the fptools configuration script can define.
The current version may not use all of them; autoheader copies the ones
- your configure.in uses into your configuration header file templates.
+ your configure.ac uses into your configuration header file templates.
The entries are in sort -df order: alphabetical, case insensitive,
ignoring punctuation (such as underscores). Although this order