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diff --git a/Source/cmVariableRequiresCommand.cxx b/Source/cmVariableRequiresCommand.cxx
new file mode 100644
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+++ b/Source/cmVariableRequiresCommand.cxx
@@ -0,0 +1,72 @@
+/*=========================================================================
+
+  Program:   Insight Segmentation & Registration Toolkit
+  Module:    $RCSfile$
+  Language:  C++
+  Date:      $Date$
+  Version:   $Revision$
+
+Copyright (c) 2001 Insight Consortium
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+ * Redistributions of source code must retain the above copyright notice,
+   this list of conditions and the following disclaimer.
+
+ * Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+
+ * The name of the Insight Consortium, nor the names of any consortium members,
+   nor of any contributors, may be used to endorse or promote products derived
+   from this software without specific prior written permission.
+
+  * Modified source versions must be plainly marked as such, and must not be
+    misrepresented as being the original software.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS ``AS IS''
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+=========================================================================*/
+#include "cmVariableRequiresCommand.h"
+#include "cmCacheManager.h"
+
+// cmLibraryCommand
+bool cmVariableRequiresCommand::InitialPass(std::vector<std::string> const& args)
+{
+  if(args.size() < 4 )
+    {
+    this->SetError("called with incorrect number of arguments");
+    return false;
+    }
+  std::string testVarible = args[0]; 
+  if(m_Makefile->IsON(testVarible.c_str()))
+    {
+    return true;
+    }
+  std::string resultVarible = args[1];
+  std::string message = args[2];
+  bool requirementsMet = true;
+  std::string notSet;
+  for(int i = 3; i < args.size(); ++i)
+    {
+    if(!m_Makefile->IsOn(args[i].c_str()))
+      {
+      requirementsMet = false;
+      notSet += args[i];
+      notSet += " ";
+      }
+    }
+  return true;
+}
+