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<p>Hi,</p>
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<p>I get the below mentioned error when I try building ITKApps, which inturn builds VTK. Kindly help me resolve this.</p>
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<p>CMake Error: The following variables are used in this project, but they are set to NOTFOUND.<br>
Please set them or make sure they are set and tested correctly in the CMake files:<br>
OPENGL_INCLUDE_DIR (ADVANCED)<br>
   used as include directory in directory /ITKApps_build/VTK/Geovis/Core<br>
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-- Configuring incomplete, errors occurred!<br>
See also "/ITKApps_build/VTK/CMakeFiles/CMakeOutput.log".<br>
See also "/ITKApps_build/VTK/CMakeFiles/CMakeError.log".<br>
make[2]: *** [VTK-prefix/src/VTK-stamp/VTK-configure] Error 1<br>
make[1]: *** [CMakeFiles/VTK.dir/all] Error 2<br>
make: *** [all] Error 2<br>
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<p>How can I find OPENGL_INCLUDE_DIR on my system, please advice.<br>
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Thanks and Best Regards,<br>
Apoorva.D.A<br>
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<p style="text-align:right" align="right"><span style="font-size:17pt; letter-spacing:-3px; font-family:"Helvetica","sans-serif"; color:#0054A0; font-weight:bolder">UT</span><span style="font-size:17pt; letter-spacing:-0px; font-family:"Helvetica","sans-serif"; color:#0054A0; font-weight:bolder">
 Southwestern</span> </p>
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<p style="text-align:right" align="right"><span style="font-size:13pt; font-family:"Helvetica","sans-serif"; color:#666D70">Medical Center</span></p>
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<p style="text-align:right"><span style="font-size:10pt; font-family:"Helvetica","sans-serif"; color:#666D70">The future of medicine, today.</span></p>
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