AC_ARG_ENABLE(pth, [ --enable-pth enable GNU threads],[enable_pth=$enableval],[enable_pth=no])
AC_SUBST(LIBPTH)
if test "$enable_pth" = "yes"; then
AC_ARG_ENABLE(pth, [ --enable-pth enable GNU threads],[enable_pth=$enableval],[enable_pth=no])
AC_SUBST(LIBPTH)
if test "$enable_pth" = "yes"; then