2 An <stdarg.h> that conforms to C99.
10 dnl Some compilers (e.g., AIX 5.3 cc) need to be in c99 mode
11 dnl for the builtin va_copy to work. With Autoconf 2.60 or later,
12 dnl AC_PROG_CC_STDC arranges for this. With older Autoconf AC_PROG_CC_STDC
13 dnl shouldn't hurt, though installers are on their own to set c99 mode.
14 AC_REQUIRE([AC_PROG_CC_STDC])