[AC_REQUIRE([AC_FUNC_ALLOCA])dnl
AC_REQUIRE([AC_TYPE_MBSTATE_T])dnl
AC_CHECK_DECLS([isblank], [], [], [#include <ctype.h>])
-AC_CHECK_FUNCS([btowc iswctype mbsrtowcs mempcpy wmemchr wmemcpy wmempcpy])
-AC_CHECK_HEADERS([wctype.h])
+AC_CHECK_FUNCS_ONCE([btowc iswctype mbsrtowcs mempcpy wmemchr wmemcpy wmempcpy])
+AC_CHECK_HEADERS_ONCE([wctype.h])
AC_LIBOBJ([fnmatch])
FNMATCH_H=fnmatch.h
])# _AC_LIBOBJ_FNMATCH