| Macros by Category | Revision History | 
   AX_REQUIRE_ONE_FUNC (FUNCTION..., [ACTION-IF-ANY-FOUND],
   [ACTION-IF-NONE-FOUND])
  
AX_REQUIRE_ONE_FUNC is a simple wrapper for AC_CHECK_FUNCS. It calls AC_CHECK_FUNCS on the list of functions named in the first argument, then invokes ACTION-IF-ANY-FOUND if at least one of the functions exists or ACTION-IF-NONE-FOUND if none of the functions exist.
Here's an example:
    AX_REQUIRE_ONE_FUNC([posix_memalign memalign valloc], ,
      [AC_MSG_ERROR([unable to allocate page-aligned memory])])
  http://autoconf-archive.cryp.to/ax_require_one_func.m4
Copyright © 2008 Scott Pakin <pakin@uiuc.edu>
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