dnl Available from the GNU Autoconf Macro Archive at:
dnl http://www.gnu.org/software/ac-archive/htmldoc/ac_cxx_have_valarray.html
dnl
AC_DEFUN([AC_CXX_HAVE_VALARRAY],
[AC_CACHE_CHECK(whether the compiler has valarray<T>,
ac_cv_cxx_have_valarray,
[AC_LANG_SAVE
 AC_LANG_CPLUSPLUS
 AC_TRY_COMPILE([#include <valarray>
using namespace std;
],[valarray<float> x(100); return 0;],
 ac_cv_cxx_have_valarray=yes, ac_cv_cxx_have_valarray=no)
 AC_LANG_RESTORE
])
if test "$ac_cv_cxx_have_valarray" = yes; then
  AC_DEFINE(HAVE_VALARRAY,,[define if the compiler has valarray<T>])
fi
])
