[NTLK] Need help with compiling and running WatsonEnabler under Linux

[NewtonTalk]

Hi experts,

I've been trying to get WatsonEnabler running on a VirtualBox Ubuntu VM.
I'll spare you the gruesome details of little Frank trying to find his way
through the confusing maze called Linux for the first time in his life.
Suffice it to say that it so far cost three nights, is far from finished,
and as to WatsonEnabler has been a miserable failure. Hopefully, some of the
experts on this list will be able to help me...


1) I have installed a brand spanking new Ubuntu Virtual Machine using
VirtualBox on a Windows 10 machine.

2) I've downloaded the following zip file from GitHub:

     <https://github.com/pguyot/DCL/archive/refs/heads/master.zip>

Unzipping this file ended up in a folder DCL-master.

2) The way I understand things, this folder must be compiled before it can
be of any use to me. At this point I'd like to point out that I neither have
Visual Studio installed on this virtual machine nor, to the best of my
knowledge, any other C++ compiler, unless such a C++ compiler is part of an
standard Ubuntu distribution.

3) According to Paul's readme file this, compilation is done as follows:

     mkdir build
     cd build
     cmake .. -DCMAKE_BUILD_TYPE=Debug
     cmake --build .
     ctest . -C Debug

This is where I get unsure for the first time. Where, relative to the
DCL-master folder, must the build directory be located? Inside this folder?
Elsewhere? Does this matter at all?

4) Based on an assumption I created the directory inside the DCL-master
folder and changed into it.

5) Typing

     "cmake .. -DCMAKE_BUILD_TYPE=Debug"

provided me with the information that cmake was not found. It seems it isn't
part of a standard Linux distribution. This problem was fixed by proceeding
as the Ubuntu terminal kindly suggested, namely by entering

     sudo apt install cmake     

This installation seems to have worked, since now I'm getting usage hints
when typing "cmake".

5) Typing

     "cmake .. -DCMAKE_BUILD_TYPE=Debug"

again, I'm now getting the following:

-------------------------------------------------
gruendef at gruendef-VirtualBox:~/Desktop/Hoffentlich/DCL-master/build$ cmake
.. -DCMAKE_BUILD_TYPE=Debug
-- The CXX compiler identification is unknown
CMake Error at CMakeLists.txt:2 (project):
  No CMAKE_CXX_COMPILER could be found.

  Tell CMake where to find the compiler by setting either the environment
  variable "CXX" or the CMake cache entry CMAKE_CXX_COMPILER to the full
path
  to the compiler, or to the compiler name if it is in the PATH.


-- Configuring incomplete, errors occurred!
See also
"/home/gruendef/Desktop/Hoffentlich/DCL-master/build/CMakeFiles/CMakeOutput.
log".
See also
"/home/gruendef/Desktop/Hoffentlich/DCL-master/build/CMakeFiles/CMakeError.l
og".
gruendef at gruendef-VirtualBox:~/Desktop/Hoffentlich/DCL-master/build$ 
-------------------------------------------------

I swear by everything I hold sacred that I've tried to find the solution on
my own. It seems that this problem isn't all that uncommon, but as a Linux
newbie the explanations and suggestions are all Greek to me. 

What can I do? And, if the miracle happens and I can make this compile
within my statistically remaining lifetime, which unfortunately isn't all
that long: How would I continue in order to make a Newton package usable on
a Watson?

Thanks, as usual!

Frank

-- Newton software and hardware at http://www.pda-soft.de