Hi Ankush,
The setup that you've downloaded from the OSEHRA repository has been set up to build using CMake. There is a reStructuredText file that has the directions on how to build CPRS using CMake in the top-level directory of that repository:
https://github.com/OSEHRA/VistA/blob/master/BUILD-Delphi.rst. This should allow you to build the system without needing to alter your Delphi environment. Two caveats, this file gives directions assuming that you are using the whole VistA source tree, not just a single downloaded folder or set of files like you likely have now and it assumes that you have an environment that uses Delphi 2007.
The ".in" notation, as in
dpr.in or
dproj.in, means that the file will be configured (
http://www.cmake.org/cmake/help/v3.0/command/configure_file.html) by CMake. It is a common process used throughout the OSEHRA source tree to allow the tailoring of the resultant program and files for each individual system based upon variables set by the user. After CMake has been run, the files with their proper extension will be found in the build directory along with a Makefile.
Hope that helps,
Joe Snyder
Kitware Inc.