fix AM_CONDITIONAL

[[Imported from SVN: r5243]]

bin/dunecontrol

@@ -584,15 +584,17 @@ AC_DEFUN([DUNE_CHECK_MOD_DEPENDENCIES], [
   AC_PROG_CXX
   LT_OUTPUT
 EOF
-    ### initialize AM_CONDITIONAL for suggestions
+    ### initialize AM_CONDITIONAL for suggestions that were not found
     for name in $(eval echo \$SUGS_$mainmod); do
       mod=$(fix_variable_name $name)
-	  MOD=`echo $mod | tr [:lower:] [:upper:]`
-      cat >> $fname <<EOF
+      MOD=`echo $mod | tr [:lower:] [:upper:]`
+      if test "x$(eval echo \$HAVE_$mod)" = "x"; then
+        cat >> $fname <<EOF
   ### add a conditional check for $name,
   # just in case the module is not available at autogen time
   AM_CONDITIONAL([HAVE_${MOD}], false)
 EOF
+      fi
     done
 	### DEPENDENCIES
     if test "x$SEARCH_MODULES" != "x"; then
@@ -620,8 +622,6 @@ EOF
 	  MOD=`echo $mod | tr [:lower:] [:upper:]`
 	  cat >> $fname <<EOF
   ### check suggestion $name
-  # add a conditional check, just in case the module is not available
-  AM_CONDITIONAL([HAVE_${MOD}])
   # invoke checks required by this module
   AC_REQUIRE([${MOD}_CHECKS])
   # invoke check for this module