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(autocf21.info.gz) Existing Tests

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 4 Existing Tests
 ****************
 
 These macros test for particular system features that packages might
 need or want to use.  If you need to test for a kind of feature that
 none of these macros check for, you can probably do it by calling
 primitive test macros with appropriate arguments ( Writing
 Tests).
 
    These tests print messages telling the user which feature they're
 checking for, and what they find.  They cache their results for future
 `configure' runs ( Caching Results).
 
    Some of these macros set output variables.   Makefile
 Substitutions, for how to get their values.  The phrase "define NAME"
 is used below as a shorthand to mean "define C preprocessor symbol NAME
 to the value 1".   Defining Symbols, for how to get those symbol
 definitions into your program.
 

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* Alternative Programs        Selecting between alternative programs.
* Libraries                   Library archives that might be missing.
* Library Functions           C library functions that might be missing.
* Header Files                Header files that might be missing.
* Structures                  Structures or members that might be missing.
* Typedefs                    `typedef's that might be missing.
* C Compiler Characteristics
* Fortran 77 Compiler Characteristics
* System Services             Operating system services.
* UNIX Variants               Special kludges for specific UNIX variants.
 
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