Defines terminal control library to be used.
The INFORMIXTERM environment variable indicates what terminal capabilities database must be used by the runtime system when running a program in TUI mode on a dumb terminal.
Possible values of INFORMIXTERM are terminfo and termcap. If the variable is not set, it defaults to termcap.
When set to termcap (the default), the runtime system reads terminal capabilities from the file defined by the TERMCAP environment variable.
When set to terminfo, the runtime system reads terminal capabilities from the terminfo database of the system (ncurses).