Index: /trunk/Mars/macros/rootlogon.C
===================================================================
--- /trunk/Mars/macros/rootlogon.C	(revision 15268)
+++ /trunk/Mars/macros/rootlogon.C	(revision 15269)
@@ -184,11 +184,11 @@
     TString lib(gSystem->GetLinkedLibs());
 
-    opt += " -D__MARS__ ";
+    opt += " -D__MARS__ -DHAVE_ZLIB";
     opt += " -std=c++0x ";
 
-    dbg += " -D__MARS__ ";
+    dbg += " -D__MARS__ -DHAVE_ZLIB";
     dbg += " -std=c++0x ";
 
-    lib += " -lnova ";
+    lib += " -lnova -lz";
 
     gSystem->SetLinkedLibs(lib);