You might also need to check for the existence of files. Before using these macros, ask yourself whether a run time test might not be a better solution. Be aware that, like most Autoconf macros, they test a feature of the host machine, and therefore, they die when cross-compiling.
function>AC_CHECK_FILE/function> (file, [action-if-found], [action-if-not-found]) Check whether file file exists on the native system. If it is found, execute action-if-found, otherwise do action-if-not-found, if given.
function>AC_CHECK_FILES/function> (files, [action-if-found], [action-if-not-found]) Executes AC_CHECK_FILE once for each file listed in files. Additionally, defines HAVE_file (the section called “Standard Symbols”) for each file found.