+dnl #
+dnl # 4. determine a few additional details
+dnl #
+
+if test "x$with_context" = "xucontext" ; then
+dnl # direction of stack grow
+ AC_CHECK_STACKGROWTH(PTH_STACKGROWTH)
+ if test ".$ac_cv_check_stackgrowth" = ".down"; then
+ PTH_STACK_GROWTH="down"
+ else
+ PTH_STACK_GROWTH="up"
+ fi
+ AC_SUBST(PTH_STACK_GROWTH)
+
+ AC_CHECK_STACKSETUP(makecontext, pth_skaddr_makecontext, pth_sksize_makecontext)
+fi
+
+
+#########################################
+## Build optional modules (simix)
+##
+SG_CONFIGURE_PART(Optional modules)
+AC_ARG_ENABLE(simix,
+ AS_HELP_STRING([--enable-simix], [Use the new SimIX module (default=no)]),
+ enable_simix=$enableval,enable_simix=no)
+if test "x$enable_simix" = "xyes" ; then
+ AC_MSG_RESULT(***** You have decided to use the experimental SimIX. We hope you know what you're doing.. ****)
+ AC_DEFINE(USE_SIMIX, 1, [Indicates whether we should use SimIX or not])
+else
+ AC_MSG_RESULT(Eventually you will come to SimIX.)
+fi
+AM_CONDITIONAL(USE_SIMIX,test x$enable_simix != xno)
+
+#########################################
+## Build optional modules (gtnets)
+##
+AC_ARG_WITH(gtnets,
+ AS_HELP_STRING([--with-gtnets], [Path to GTNetS installation (default to empty, ie not using GTNetS)]),
+ gtnets_path="$withval",gtnets_path="NO")
+if test "x$gtnets_path" = "xNO" ; then
+ AC_MSG_RESULT(Eventually you will come to GTNetS.)
+else
+ AC_MSG_RESULT(***** You have decided to use the experimental GTNetS. We hope you know what you're doing.. ****)
+ AC_DEFINE(USE_GTNETS, 1, [Indicates whether we should use GTNetS or not])
+ if ! test -e $gtnets_path ; then
+ AC_MSG_ERROR(Provided path to GTNetS include files ($gtnets_path) do not exist!)
+ fi
+ GTNETS_CFLAGS=-I$gtnets_path/include
+ AC_SUBST([GTNETS_CFLAGS])
+ GTNETS_LDFLAGS=-L$gtnets_path/lib
+ AC_SUBST([GTNETS_LDFLAGS])
+fi
+AM_CONDITIONAL(USE_GTNETS,test "x$gtnets_path" != xNO)
+