Hi Kevin,

Well, g++ was already in /usr/bin, but I followed your recommendation 
anyway, and got this:

Script started on 2017-12-04 19:25:38-0500
[archie@debian ~]$ sudo aptitude install g++
 [  0%] Reading package lists                            [100%] Reading package lists                            [  0%] Building dependency tree                               [100%] Building dependency tree                               [  0%] Reading state information                                [ 16%] Reading state information                                [  0%] Reading extended state information                                         [  0%] Initializing package states                                  [  0%] Writing extended state information                                         [  0%] Building tag database                            g++ is already installed at the requested version (4:7.2.0-1d1)
g++ is already installed at the requested version (4:7.2.0-1d1)
No packages will be installed, upgraded, or removed.
0 packages upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B of archives. After unpacking 0 B will be used.
 [  0%] Writing extended state information                                         [100%] Writing extended state information                                         [  0%] Reading package lists                            [  0%] Building dependency tree                               [100%] Building dependency tree                               [  0%] Reading state information                                [ 16%] Reading state information                                [  0%] Reading extended state information                                         [  0%] Initializing package states                                  [  0%] Writing extended state information                                         [  0%] Building tag database                            [100%] Building tag database 
[archie@debian ~]$ which g++
/usr/bin/g++
[archie@debian ~]$ cd src/tidy-html5-master/build/cmake/
[archie@debian cmake]$ sudo export CMAKE_CXX_COMPILER=/usr/bin/g++
[archie@debian cmake]$ cmake ../..
-- The CXX compiler identification is unknown
-- Check for working CXX compiler: /usr/bin/cpp
-- Check for working CXX compiler: /usr/bin/cpp -- broken
CMake Error at /usr/share/cmake-3.9/Modules/CMakeTestCXXCompiler.cmake:44 (message):
   The C++ compiler "/usr/bin/cpp" is not able to compile a simple test
   program.

   It fails with the following output:

    Change Dir: /home/archie/src/tidy-html5-master/build/cmake/CMakeFiles/CMakeTmp



   Run Build Command:"/usr/bin/make" "cmTC_0f396/fast"

   /usr/bin/make -f CMakeFiles/cmTC_0f396.dir/build.make
   CMakeFiles/cmTC_0f396.dir/build

   make[1]: Entering directory
   '/home/archie/src/tidy-html5-master/build/cmake/CMakeFiles/CMakeTmp'

   Building CXX object CMakeFiles/cmTC_0f396.dir/testCXXCompiler.cxx.o

   /usr/bin/cpp -o CMakeFiles/cmTC_0f396.dir/testCXXCompiler.cxx.o -c
   /home/archie/src/tidy-html5-master/build/cmake/CMakeFiles/CMakeTmp/testCXXCompiler.cxx


   cpp: fatal error: ¡-c¢ is not a valid option to the preprocessor

   compilation terminated.

   CMakeFiles/cmTC_0f396.dir/build.make:65: recipe for target
   'CMakeFiles/cmTC_0f396.dir/testCXXCompiler.cxx.o' failed

   make[1]: *** [CMakeFiles/cmTC_0f396.dir/testCXXCompiler.cxx.o] Error 1

   make[1]: Leaving directory
   '/home/archie/src/tidy-html5-master/build/cmake/CMakeFiles/CMakeTmp'

   Makefile:126: recipe for target 'cmTC_0f396/fast' failed

   make: *** [cmTC_0f396/fast] Error 2





   CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
   CMakeLists.txt:26 (project)


-- Configuring incomplete, errors occurred!
See also "/home/archie/src/tidy-html5-master/build/cmake/CMakeFiles/CMakeOutput.log".
See also "/home/archie/src/tidy-html5-master/build/cmake/CMakeFiles/CMakeError.log".
[archie@debian cmake]$ exit

Script done on 2017-12-04 19:34:57-0500


But look at this:

$ g++ --version
g++ (Debian 7.2.0-16) 7.2.0
Copyright (C) 2017 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is 
NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR 
PURPOSE.

Looks like it's there okay, but cmake can't find it.

Chuck








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