On Fri, 2 Oct 2020 03:38:49 -0000 (UTC), bob prohaska 
declaimed the following:
>Following the build instructions in the INSTALL file.  You will need:
>
>gcc (6+, e.g. 6.0.3)
>g++ (6+, e.g. 6.0.3)
>make (e.g. gnu make 3.8.0)
>cmake (3.0.2 or newer)
>
>All three of those have implicit dependencies on other packages.
>
>You will also want to make sure that you have the X11 development
>headers installed:
>
>  apt-get install xserver-xorg-dev libx11-dev libxi-dev libxext-dev
>
>Other development packages needed to build on Debian-based platforms:
>
>  for building the Tcl/Tk libraries:  libfontconfig-dev
>
>  for OpenGL: libglu1-mesa-dev
>
>It seems possible at least some of these are redundant, but I can't
>tell which..... All installed without any obvious complaints.

 Off-hand, nothing you least appears to be redundant...

gcc is the plain C compiler
g++ is the C++ compiler
make is the build system
cmake is a system to build makefiles for use by make

 The X11 stuff is the low-level core for interfacing to the X-Window
protocol.

 Tcl/Tk is a framework for developing GUI applications, and uses
X-Window at its base

 OpenGL is a standard for 2D/3D graphics rendering, often using hardware
acceleration.


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 Wulfraed                 Dennis Lee Bieber         AF6VN
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