b5f5bf6f03
libncurses in base system only supports termcap(5). RGB has 3 colors
but termcap(5) supports at most 2 arguments e.g.,
$ export TERMCAP="${TERM}:Co#0x1000000:AF=\E[38;2;%d;%d;%dm:AB=\E[48;2;%d;%d;%dm:tc=${TERM}:"
$ tput AB 1 1 1
tput: too many arguments (3) for capability `AB'
To work around the limitation make Emacs check if environ(7) has
COLORTERM=truecolor some terminal emulators define by default e.g.,
- x11-toolkits/vte3 (gnome-terminal, sakura, ...)
- x11/alacritty
- x11/aminal
- x11/kitty (bug 233010)
- x11/konsole
- x11/qterminal
while others require defining COLORTERM=truecolor manually e.g.,
- x11/cool-retro-term
- x11/sterm
- x11/xterm
PR: 247248
Approved by: jrm
Obtained from: upstream
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