Re: [PATCH/RFC] autoconf: Add test for OLD_ICONV

> diff --git a/configure.ac b/configure.ac
> index 5f8a15b..5d2936e 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -212,6 +212,27 @@ test -n "$NEEDS_SOCKET" && LIBS="$LIBS -lsocket"
>  
>  
>  ## Checks for header files.
> +AC_MSG_NOTICE([CHECKS for header files])
> +#
> +# Define OLD_ICONV if your library has an old iconv(), where the second
> +# (input buffer pointer) parameter is declared with type (const char **).
> +AC_DEFUN([OLDICONVTEST_SRC], [[
> +#include <iconv.h>
> +
> +int main(void)
> +{
> +	iconv_t cd;
> +	char *ibp, *obp;
> +	size_t insz, outsz;
> +	iconv(cd, &ibp, &insz, &obp, &outsz);
> +}
> +]])
> +AC_MSG_CHECKING([for old iconv()])
> +AC_COMPILE_IFELSE(OLDICONVTEST_SRC,
> +	[AC_MSG_RESULT([no])],
> +	[AC_MSG_RESULT([yes])
> +	OLD_ICONV=YesPlease])
> +AC_SUBST(OLD_ICONV)
>