supdup is a client (and supdupd is a server) implementing the SUPDUP (Super Duper TELNET) protocol, a highly efficient TELNET-style remote display protocol, on UNIX-like systems.

It originated as a private protocol between the Chaosnet-connected ITS systems at MIT to allow a user at any one of these systems to use one of the others as a display; later implementations were developed for various platforms.

The software creates connections over TCP/IP and Chaosnet (optionally using the cbridge software).

• Install prerequisite packages:
  • Required: make (GNU), ncurses (libraries and headers),
  • Recommended: pkg-config
• Build: gmake (or sometimes just make)

• env CC="gcc" CFLAGS="-Wall" LDFLAGS="-L/usr/local" gmake

• Install prerequisite packages:
  • dnf install make ncurses-devel pkg-config
• Build with IBM XL C V16:
  • env CC="xlc" CFLAGS="-q64" LDFLAGS="-q64" gmake
• Build with IBM Open XL C V17:
  • env CC="ibm-clang" CFLAGS="-m64" LDFLAGS="-m64" gmake
• Build with GNU GCC:
  • env CC="gcc" CFLAGS="-maix64" LDFLAGS="-maix64 -Wl,-b64" gmake
• Build with Clang:
  • env CC="clang" CFLAGS="-m64" LDFLAGS="-m64" gmake

• Install prerequisite packages:
  • yum install gcc10 make-gnu ncurses-devel pkg-config
• Build with GNU GCC:
  • env CC="gcc-10" CFLAGS="-maix64" LDFLAGS="-maix64 -Wl,-b64" gmake

• dmd -betterC -c -of=supdup.o chaos.c charmap.c supdup.c tcp.c $(pkg-config --cflags-only-I ncurses)
• cc -o supdup supdup.o $(pkg-config --libs ncurses)

• Install prerequisite packages: make (GNU)
• Build: gmake (or sometimes just make)

• https://github.com/PDP-10/supdup/issues/new/choose