Short summary: cmake runs examples fine when I run it in the pre-installed 
src example folder, but not after I copied it to ~/shared. Could you please 
help see why?

Full story: first, when I run it in the pre-installed src example folder, 
it works:
```
E:\dealii>docker pull 
dealii/dealii:v8.5.1-gcc-mpi-fulldepscandi-debugrelease
v8.5.1-gcc-mpi-fulldepscandi-debugrelease: Pulling from dealii/dealii
Digest: 
sha256:5c6ed25801292f715136bdad411e7dcda1d8f647f60c31be10533aa2697582ac
Status: Image is up to date for 
dealii/dealii:v8.5.1-gcc-mpi-fulldepscandi-debugrelease

E:\dealii>docker run -i -t -v E:\dealii:/home/dealii/shared 
dealii/dealii:v8.5.1-gcc-mpi-fulldepscandi-debugrelease
dealii@d0e24c0315a5:~$ cd dealii-v8.5.1-src/examples/step-1
dealii@d0e24c0315a5:~/dealii-v8.5.1-src/examples/step-1$ cmake 
CMakeLists.txt
-- The C compiler identification is GNU 6.2.0
-- The CXX compiler identification is GNU 6.2.0
-- Check for working C compiler: /usr/bin/mpicc
-- Check for working C compiler: /usr/bin/mpicc -- 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: /usr/bin/mpicxx
-- Check for working CXX compiler: /usr/bin/mpicxx -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Autopilot invoked
###
#
#  Project  step-1  set up with  deal.II-8.5.1  found at
#      /home/dealii/dealii-v8.5.1
#
#  CMAKE_BUILD_TYPE:          Debug
#
#  You can now run
#       $ make                - to compile and link the program
#       $ make run            - to (compile, link and) run the program
#
#       $ make debug          - to switch the build type to 'Debug'
#       $ make release        - to switch the build type to 'Release'
#
#       $ make edit_cache     - to change (cached) configuration variables
#                               and rerun the configure and generate phases 
of CMake
#
#       $ make strip_comments - to strip the source files in this
#                               directory off the documentation comments
#       $ make clean          - to remove the generated executable as well 
as
#                               all intermediate compilation files
#       $ make runclean       - to remove all output generated by the 
program
#       $ make distclean      - to clean the directory from _all_ generated
#                               files (includes clean, runclean and the 
removal
#                               of the generated build system)
#       $ make info           - to view this message again
#
#  Have a nice day!
#
###
-- Configuring done
-- Generating done
-- Build files have been written to: 
/home/dealii/dealii-v8.5.1-src/examples/step-1
dealii@d0e24c0315a5:~/dealii-v8.5.1-src/examples/step-1$ make run
Scanning dependencies of target step-1
[ 33%] Building CXX object CMakeFiles/step-1.dir/step-1.cc.o
[ 66%] Linking CXX executable step-1
[ 66%] Built target step-1
Scanning dependencies of target run
[100%] Run step-1 with Debug configuration
Grid written to grid-1.eps
Grid written to grid-2.eps
[100%] Built target run
```


However, if I copy the examples to my local folder, it wouldn't work. 
(Sorry for the 2 lines where I forgot to delete the files first)

```
dealii@d0e24c0315a5:~/dealii-v8.5.1-src/examples/step-1$ cp -r 
~/dealii-v8.5.1-src/examples ~/shared/examples
dealii@d0e24c0315a5:~/dealii-v8.5.1-src/examples/step-1$ cd 
~/shared/examples/step-1
dealii@d0e24c0315a5:~/shared/examples/step-1$ cmake CMakeLists.txt
CMake Error: The current CMakeCache.txt directory 
/home/dealii/shared/examples/step-1/CMakeCache.txt is different than the 
directory /home/dealii/dealii-v8.5.1-src/examples/step-1 where 
CMakeCache.txt was created. This may result in binaries being created in 
the wrong place. If you are not sure, reedit the CMakeCache.txt
CMake Error: The source 
"/home/dealii/shared/examples/step-1/CMakeLists.txt" does not match the 
source "/home/dealii/dealii-v8.5.1-src/examples/step-1/CMakeLists.txt" used 
to generate cache.  Re-run cmake with a different source directory.
dealii@d0e24c0315a5:~/shared/examples/step-1$ ls | grep -v 
'CMakeLists.txt\|step-1.cc' | xargs rm -rf
dealii@d0e24c0315a5:~/shared/examples/step-1$ ls
CMakeLists.txt  step-1.cc
dealii@d0e24c0315a5:~/shared/examples/step-1$ cmake CMakeLists.txt
-- The C compiler identification is GNU 6.2.0
-- The CXX compiler identification is GNU 6.2.0
-- Check for working C compiler: /usr/bin/mpicc
-- Check for working C compiler: /usr/bin/mpicc -- broken
CMake Error at /usr/share/cmake-3.5/Modules/CMakeTestCCompiler.cmake:61 
(message):
  The C compiler "/usr/bin/mpicc" is not able to compile a simple test
  program.

  It fails with the following output:

   Change Dir: /home/dealii/shared/examples/step-1/CMakeFiles/CMakeTmp



  Run Build Command:"/usr/bin/make" "cmTC_f6b04/fast"

  make: *** No rule to make target 'cmTC_f6b04/fast'.  Stop.





  CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
  CMakeLists.txt:38 (PROJECT)


-- Configuring incomplete, errors occurred!
See also "/home/dealii/shared/examples/step-1/CMakeFiles/CMakeOutput.log".
See also "/home/dealii/shared/examples/step-1/CMakeFiles/CMakeError.log".
```

Could you please help?

Thank you,
Shawn

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