+ # FIXME: I shouldn't have to require this macro here. Rather, it should
+ # be required by any autoconf macro that performs a compile-time test or
+ # otherwise uses confdefs.h.
+ AC_REQUIRE([AC__GNU_SOURCE])
+
+ dnl This test must come as early as possible after the compiler configuration
+ dnl tests, because the choice of the file model can (in principle) affect
+ dnl whether functions and headers are available, whether they work, etc.
+ AC_REQUIRE([AC_SYS_LARGEFILE])
+
+ dnl This test must precede tests of compiler characteristics like
+ dnl that for the inline keyword, since it may change the degree to
+ dnl which the compiler supports such features.
+ AC_REQUIRE([AM_C_PROTOTYPES])
+