AC_CHECK_FUNCS_ONCE([__fpurge])
AC_CHECK_DECLS([fpurge], , , [[#include <stdio.h>]])
if test "x$ac_cv_func_fpurge" = xyes; then
AC_CHECK_FUNCS_ONCE([__fpurge])
AC_CHECK_DECLS([fpurge], , , [[#include <stdio.h>]])
if test "x$ac_cv_func_fpurge" = xyes; then