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(autoconf.info)Existing Tests

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Existing Tests
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   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 (Note: 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 (Note: Caching Results).

   Some of these macros set output variables.  Note: 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".  Note: Defining Symbols, for how to get those symbol
definitions into your program.

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.