@Biplab (cc: other wx2.9 user/devs):
you have disabled the compiler versiondetection in 
rev 5616.
This breaks the using of precompiled headers, if they are not besides the headers, because C::B uses 
-I- instead of 
-iquote to prepend the include-dir, where the pch's are.
Is this still needed ?
It seems to work on linux 64 bit with wx2.9.4 from trunk and on win7 with wx2.9.3 from official download.
If it is still needed, I would like to change the ifdef with this patch:
@@ -322,7 +322,9 @@ void CompilerMINGW::SetVersionString()
 {
     /*  NOTE (Biplab#9#): There is a critical bug which blocks C::B from starting up.
         So we'll disable version string checking till we fix the bug. */
-    #if !wxCHECK_VERSION(2, 9, 0)
+    #if wxCHECK_VERSION(2, 9, 0)
+    m_VersionString = _T("4.5.0");
+    #else
 //    Manager::Get()->GetLogManager()->DebugLog(_T("Compiler detection for compiler ID: '") + GetID() + _T("' (parent ID= '") + GetParentID() + _T("')"));
 
     wxArrayString output, errors;
Just a dirty hack, but compilers less than 4.x.x will hopefully not be used very much with wx2.9 builds.