Compiling Caffe with Cmake and Ninja fails - cmake

Question

I tried compiling Caffe on windows with CMAKE_BUILD_SHARED_LIBS option on, but it failed and stated I need to use Ninja. When I set Ninja to 1 in the config file (build_win.cmd), and run the script, it complains and gives the following error message:
CMake Error: CMake was unable to find a build program corresponding to
"Ninja". CMAKE_MAKE_PROGRAM is not set. You probably need to select
a different build tool. CMake Error: CMAKE_C_COMPILER not set, after
EnableLanguage CMake Error: CMAKE_CXX_COMPILER not set, after
EnableLanguage
-- Configuring incomplete, errors occurred! ERROR: Configure failed
I don't know what other steps I need to take in order to have a successful compilation process. All I did was to download Ninja, extract it somewhere and add it to my environment variable.
Do I need to install gcc as well?
Update
As suggested in the comments, I checked my path and noticed it was ill-configured. I fixed that now I get these errors, it seems it can't find the needed libraries:
-- The C compiler identification is GNU 6.3.0
-- The CXX compiler identification is GNU 6.3.0
-- Check for working C compiler: C:/Users/Master/gcc/bin/gcc.exe
-- Check for working C compiler: C:/Users/Master/gcc/bin/gcc.exe -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: C:/Users/Master/gcc/bin/c++.exe
-- Check for working CXX compiler: C:/Users/Master/gcc/bin/c++.exe -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
CMake Warning at C:/Program Files/CMake/share/cmake-3.7/Modules/FindBoost.cmake:744 (message):
Imported targets not available for Boost version
Call Stack (most recent call first):
C:/Program Files/CMake/share/cmake-3.7/Modules/FindBoost.cmake:848 (_Boost_COMPONENT_DEPENDENCIES)
C:/Program Files/CMake/share/cmake-3.7/Modules/FindBoost.cmake:1435 (_Boost_MISSING_DEPENDENCIES)
cmake/Dependencies.cmake:8 (find_package)
CMakeLists.txt:79 (include)
CMake Warning at C:/Program Files/CMake/share/cmake-3.7/Modules/FindBoost.cmake:744 (message):
Imported targets not available for Boost version
Call Stack (most recent call first):
C:/Program Files/CMake/share/cmake-3.7/Modules/FindBoost.cmake:848 (_Boost_COMPONENT_DEPENDENCIES)
C:/Program Files/CMake/share/cmake-3.7/Modules/FindBoost.cmake:1435 (_Boost_MISSING_DEPENDENCIES)
cmake/Dependencies.cmake:8 (find_package)
CMakeLists.txt:79 (include)
CMake Warning at C:/Program Files/CMake/share/cmake-3.7/Modules/FindBoost.cmake:744 (message):
Imported targets not available for Boost version
Call Stack (most recent call first):
C:/Program Files/CMake/share/cmake-3.7/Modules/FindBoost.cmake:848 (_Boost_COMPONENT_DEPENDENCIES)
C:/Program Files/CMake/share/cmake-3.7/Modules/FindBoost.cmake:1435 (_Boost_MISSING_DEPENDENCIES)
cmake/Dependencies.cmake:8 (find_package)
CMakeLists.txt:79 (include)
-- Looking for pthread.h
-- Looking for pthread.h - not found
-- Found Threads: TRUE
CMake Error at C:/Program Files/CMake/share/cmake-3.7/Modules/FindBoost.cmake:1793 (message):
Unable to find the requested Boost libraries.
Unable to find the Boost header files. Please set BOOST_ROOT to the root
directory containing Boost or BOOST_INCLUDEDIR to the directory containing
Boost's headers.
Call Stack (most recent call first):
cmake/Dependencies.cmake:8 (find_package)
CMakeLists.txt:79 (include)
-- Could NOT find GFlags (missing: GFLAGS_INCLUDE_DIR GFLAGS_LIBRARY)
-- Could NOT find Glog (missing: GLOG_INCLUDE_DIR GLOG_LIBRARY)
CMake Error at C:/Program Files/CMake/share/cmake-3.7/Modules/FindPackageHandleStandardArgs.cmake:138 (message):
Could NOT find Protobuf (missing: Protobuf_LIBRARIES Protobuf_INCLUDE_DIR)
Call Stack (most recent call first):
C:/Program Files/CMake/share/cmake-3.7/Modules/FindPackageHandleStandardArgs.cmake:378 (_FPHSA_FAILURE_MESSAGE)
C:/Program Files/CMake/share/cmake-3.7/Modules/FindProtobuf.cmake:393 (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
cmake/ProtoBuf.cmake:9 (find_package)
cmake/Dependencies.cmake:48 (include)
CMakeLists.txt:79 (include)
-- Configuring incomplete, errors occurred!
See also "G:/caffe_latest2/build/CMakeFiles/CMakeOutput.log".
See also "G:/caffe_latest2/build/CMakeFiles/CMakeError.log".
ERROR: Configure failed

Answer 1

I found the cause. I had installed GCC on my system, and cmake would try to use that instead of Visual C++ compiler.
All that is needed is just downloading Ninja, placing it in your Path Variable and you are good to go.
Change the needed settings in the build_win.cmd to use Ninja and you are done