Patch not found CMake error while building heka on windows

[vpriyada]

After cloning heka repository from git using git clone https://github.com/mozilla-services/heka I executed build.bat file.
I encountered the following error:
**-- GeoIP.h was not found, GeoIP functionality will not be included in this build.
-- sphinx-build was not found, the documentation will not be generated.
CMake Error at cmake/externals.cmake:10 (message):
patch not found
Call Stack (most recent call first):
CMakeLists.txt:111 (include)

-- Configuring incomplete, errors occurred!
See also "C:/Users/ypandiar/Downloads/Hekad_windows/Heka_Fresh/heka/build/CMakeFiles/CMakeOutput.log".
-- GeoIP.h was not found, GeoIP functionality will not be included in this build.
-- sphinx-build was not found, the documentation will not be generated.
CMake Error at cmake/externals.cmake:10 (message):
patch not found
Call Stack (most recent call first):
CMakeLists.txt:111 (include)

-- Configuring incomplete, errors occurred!
See also "C:/Users/ypandiar/Downloads/Hekad_windows/Heka_Fresh/heka/build/CMakeFiles/CMakeOutput.log".
Makefile:1013: recipe for target 'cmake_check_build_system' failed
mingw32-make: * [cmake_check_build_system] Error 1

The path of Git is set to C:\Program Files\Git\cmd (System PATH variable)
The path of cmake is added to user created environment variable : C:\Program Files\CMake\bin;
CMake version: 3.6.0-rc2-win64-x64.msi

Have you encountered such issues during installation.
Could any of you point out what should be corrected to make it run.
I followed the steps from http://hekad.readthedocs.io/en/v0.10.0/installing.html
I also referred the issue #1829
but couldnt find the solution from the above link.