+PKG_CHECK_MODULES(ORBIT,ORBit-2.0)
+dnl AM_PATH_ORBIT2() also sets 'ORBIT_IDL':
+AC_PATH_PROG(ORBIT_IDL,orbit-idl-2)
+
+AC_ARG_WITH(orbit-line,[ --with-orbit-line=[link/linc/auto] Use 'link' for ORBit2 >=2.7.x+ (def.=auto)],,with_orbit_line=auto)
+captive_save_CFLAGS="$CFLAGS"
+captive_save_LIBS="$LIBS"
+CFLAGS="$CFLAGS $ORBIT_CFLAGS"
+LIBS="$LIBS $ORBIT_LIBS"
+AC_CHECK_FUNC(link_get_tmpdir,[
+ AC_DEFINE(HAVE_ORBIT_LINK,,[ORBit2 is 2.7.x+ and therefore includes its own 'link' library])
+ found_orbit_line=link
+ ],
+ found_orbit_line=linc
+ )
+CFLAGS="$captive_save_CFLAGS"
+LIBS="$captive_save_LIBS"
+if test "x$with_orbit_line" != "xauto" -a "x$with_orbit_line" != "x$found_orbit_line";then
+ AC_MSG_ERROR([--with-orbit-line=$with_orbit_line specified but the detected line is $found_orbit_line])
+fi
+
+if test "x$found_orbit_line" = "xlinc";then
+ PKG_CHECK_MODULES(LINC,linc)
+fi