diff -ur root-5.32.00.orig/core/meta/src/TCint.cxx root-5.32.00/core/meta/src/TCint.cxx
--- root-5.32.00.orig/core/meta/src/TCint.cxx	2011-12-02 12:41:50.000000000 +0100
+++ root-5.32.00/core/meta/src/TCint.cxx	2012-02-18 12:07:12.157520013 +0100
@@ -320,25 +320,29 @@
    ProcessLine("#define ROOT_TError 0");
    ProcessLine("#define ROOT_TGenericClassInfo 0");   
 
-   TString include;
-   // Add the root include directory to list searched by default
+   Int_t includes = gEnv->GetValue("Cint.Includes", 1);
+   if (includes > 0) {
+      TString include;
+      // Add the root include directory to list searched by default
 #ifndef ROOTINCDIR
-   include = gSystem->Getenv("ROOTSYS");
-   include.Append("/include");
+      include = gSystem->Getenv("ROOTSYS");
+      include.Append("/include");
 #else
-   include = ROOTINCDIR;
+      include = ROOTINCDIR;
 #endif
-  TCint::AddIncludePath(include);
+      TCint::AddIncludePath(include);
 
-   // Allow the usage of ClassDef and ClassImp in interpreted macros
-   // if RtypesCint.h can be found (think of static executable without include/)
-  char* whichTypesCint = gSystem->Which(include, "RtypesCint.h");
-  if (whichTypesCint) {
-      ProcessLine("#include <RtypesCint.h>");
-      delete[] whichTypesCint;
-  }
-  // We cannot autoload this but ROOT needs it (ROOT-7103)
-  ProcessLine("#include <iostream>");
+      // Allow the usage of ClassDef and ClassImp in interpreted macros
+      // if RtypesCint.h can be found (think of static executable without
+      // include/)
+      char* whichTypesCint = gSystem->Which(include, "RtypesCint.h");
+      if (whichTypesCint) {
+         ProcessLine("#include <RtypesCint.h>");
+         delete[] whichTypesCint;
+      }
+      // We cannot autoload this but ROOT needs it (ROOT-7103)
+      ProcessLine("#include <iostream>");
+   }
 }
 
 //______________________________________________________________________________