1 files changed, 27 insertions, 2 deletions
diff --git a/tikzit/src/common/GraphChange.m b/tikzit/src/common/GraphChange.m
index 02999c8..7375150 100644
--- a/tikzit/src/common/GraphChange.m
+++ b/tikzit/src/common/GraphChange.m
@@ -41,8 +41,33 @@
 @synthesize affectedEdges, affectedNodes;
 @synthesize edgeRef, nodeRef;
 
-@synthesize oldNode, nwNode;
-@synthesize oldEdge, nwEdge;
+// For some reason, gcc screws up the typing for these
+// properties when we use @synthesize, so instead we
+// define them manually.
+- (Node*) nwNode { return nwNode; }
+- (void) setNwNode:(Node*)e {
+	Node *cp = [e copy];
+	[nwNode release];
+	nwNode = cp;
+}
+- (Node*) oldNode { return oldNode; }
+- (void) setOldNode:(Node*)e {
+	Node *cp = [e copy];
+	[oldNode release];
+	oldNode = cp;
+}
+- (Edge*) nwEdge { return nwEdge; }
+- (void) setNwEdge:(Edge*)e {
+	Edge *cp = [e copy];
+	[nwEdge release];
+	nwEdge = cp;
+}
+- (Edge*) oldEdge { return oldEdge; }
+- (void) setOldEdge:(Edge*)e {
+	Edge *cp = [e copy];
+	[oldEdge release];
+	oldEdge = cp;
+}
 @synthesize oldNodeTable, nwNodeTable;
 @synthesize oldEdgeTable, nwEdgeTable;