AC_CHECK_DECLS([program_invocation_name, program_invocation_short_name],,,
[#include <errno.h>])
AC_CHECK_FUNCS_ONCE([flockfile funlockfile])
AC_CHECK_HEADERS_ONCE([features.h linewrap.h])
AC_CHECK_DECLS([program_invocation_name, program_invocation_short_name],,,
[#include <errno.h>])
AC_CHECK_FUNCS_ONCE([flockfile funlockfile])
AC_CHECK_HEADERS_ONCE([features.h linewrap.h])