1 files changed, 44 insertions, 10 deletions

diff --git a/Source/cmIfCommand.cxx b/Source/cmIfCommand.cxx
index 86803de..37daba6 100644
--- a/Source/cmIfCommand.cxx
+++ b/Source/cmIfCommand.cxx
@@ -49,9 +49,23 @@ IsFunctionBlocked(const char *name, const std::vector<std::string> &args,
     {
     return true;
     }
-  if (strcmp(args[0].c_str(),m_Define.c_str()))
+  if (m_Not && args.size() == 2)
     {
-    return true;
+    if (strcmp(args[0].c_str(),"NOT"))
+      {
+      return true;
+      }
+    if (strcmp(args[1].c_str(),m_Define.c_str()))
+      {
+      return true;
+      }
+    }
+  else
+    {
+    if (strcmp(args[0].c_str(),m_Define.c_str()))
+      {
+      return true;
+      }
     }
   return false;
 }
@@ -71,18 +85,38 @@ bool cmIfCommand::Invoke(std::vector<std::string>& args)
     return false;
     }
 
-  // check to see if the argument is defined first
-  const char *def = m_Makefile->GetDefinition(args[0].c_str());
-  if(!cmSystemTools::IsOff(def))
+  // check for the NOT vale
+  const char *def;
+  if (args.size() == 2 && (args[0] == "NOT"))
     {
-    // do nothing
+    def = m_Makefile->GetDefinition(args[1].c_str());
+    if(!cmSystemTools::IsOff(def))
+      {
+      // create a function blocker
+      cmIfFunctionBlocker *f = new cmIfFunctionBlocker();
+      f->m_Define = args[1];
+      f->m_Not = true;
+      m_Makefile->AddFunctionBlocker(f);
+      }
+    else
+      {
+      // do nothing
+      }
     }
   else
     {
-    // create a function blocker
-    cmIfFunctionBlocker *f = new cmIfFunctionBlocker();
-    f->m_Define = args[0];
-    m_Makefile->AddFunctionBlocker(f);
+    def = m_Makefile->GetDefinition(args[0].c_str());
+    if(!cmSystemTools::IsOff(def))
+      {
+      // do nothing
+      }
+    else
+      {
+      // create a function blocker
+      cmIfFunctionBlocker *f = new cmIfFunctionBlocker();
+      f->m_Define = args[0];
+      m_Makefile->AddFunctionBlocker(f);
+      }
     }
   
   return true;