Checking For Functions and Files
Not unusual to see tests of the form
AC_CHECK_FUNCS([clearenv setenv])
AC_CHECK_HEADERS(dlfcn.h)
AC_CHECK_FUNCS(bind_textdomain_codeset)
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These tests set the values of various constants in config.h:
/* Define to 1 if you have the `clearenv' function. */
#undef HAVE_CLEARENV
/* Define to 1 if you have the `setenv' function. */
#undef HAVE_SETENV
/* Define to 1 if you have the <dlfcn.h> header file. */
#undef HAVE_DLFCN_H
/* Define to 1 if you have the `bind_textdomain_codeset' function. */
#undef HAVE_BIND_TEXTDOMAIN_CODESET
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