settings for external dependency to OpenSSL

diff --git a/examples/wscript b/examples/wscript
index 1ebcd2d..f3bca13 100644
--- a/examples/wscript
+++ b/examples/wscript
@@ -3,4 +3,4 @@
 def build(bld):
     obj = bld.create_ns3_program('syntactic-topology-ndnabstraction',
                                  ['core-module'])
-    obj.source = 'syntactic-topology-ndnabstraction.c'
\ No newline at end of file
+    obj.source = 'syntactic-topology-ndnabstraction.cc'
\ No newline at end of file