AS_LITERAL_IF (was: Re: [PATCH 00/15] Add libunistring-optional module)

[Bruno Haible]

> > And AS_LITERAL_IF was not documented in Autoconf < 2.64.
> 
> gnulib allows you to program (mostly) to Autoconf 2.64 interfaces.

If Eric adds AS_LITERAL_IF to m4/00gnulib.m4, I'll gladly use it in
gl_LIBUNISTRING_VERSION_CMP.

Bruno