Determining if the CXX compiler works failed with the following output:
Change Dir: /cygdrive/c/New/dealii-master/build/CMakeFiles/CMakeTmp

Run Build Command:"/cygdrive/c/Dwimperl/c/bin/gmake.exe" "cmTC_534af/fast"
C:/Dwimperl/c/bin/gmake -f CMakeFiles/cmTC_534af.dir/build.make CMakeFiles/cmTC_534af.dir/build
gmake[1]: Entering directory `C:/New/dealii-master/build/CMakeFiles/CMakeTmp'
Building CXX object CMakeFiles/cmTC_534af.dir/testCXXCompiler.cxx.o
/usr/bin/c++.exe     -o CMakeFiles/cmTC_534af.dir/testCXXCompiler.cxx.o -c /cygdrive/c/New/dealii-master/build/CMakeFiles/CMakeTmp/testCXXCompiler.cxx
gmake[1]: Leaving directory `C:/New/dealii-master/build/CMakeFiles/CMakeTmp'
process_begin: CreateProcess(NULL, /usr/bin/c++.exe -o CMakeFiles/cmTC_534af.dir/testCXXCompiler.cxx.o -c /cygdrive/c/New/dealii-master/build/CMakeFiles/CMakeTmp/testCXXCompiler.cxx, ...) failed.
make (e=2): The system cannot find the file specified.

gmake[1]: *** [CMakeFiles/cmTC_534af.dir/testCXXCompiler.cxx.o] Error 2
gmake: *** [cmTC_534af/fast] Error 2