If the compiler has valarray<T>, define HAVE_VALARRAY.
Download the latest version of ax_cxx_have_valarray.m4 or browse the macro’s revision history.
Copyright © 2008 Todd Veldhuizen
Copyright © 2008 Luc Maisonobe firstname.lastname@example.org
Copying and distribution of this file, with or without modification, are permitted in any medium without royalty provided the copyright notice and this notice are preserved. This file is offered as-is, without any warranty.