AS_HELP_STRING([--with-gtnets], [Path to GTNetS installation (default to empty, ie not using GTNetS)]),
gtnets_path="$withval",gtnets_path="NO")
if test "x$gtnets_path" = "xNO" ; then
AS_HELP_STRING([--with-gtnets], [Path to GTNetS installation (default to empty, ie not using GTNetS)]),
gtnets_path="$withval",gtnets_path="NO")
if test "x$gtnets_path" = "xNO" ; then