Suckless' st is my terminal emulator on Gentoo Linux, with dwm as window manager.

First see: https://st.suckless.org

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All changes i make are preceded by comments starting with "ada", so
that they can be easily traced by searching for "ada" in the code. 
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Patch applied:
1. scrollback

IMPORTANT NOTES:
1. Since i have hardcoded my preferred font into st (see config.h),
   this will only work if:
   a. you either install the same font:
      Fantasque Sans Mono (https://fontlibrary.org/en/font/fantasque-sans-mono)
      Gentoo package: media-fonts/fantasque-sans-mono
   b. you change config.h (line 8) by placing your font of choice.
2. As said by suckless (see below), remember to check config.mk
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What follows is the Original README from Suckless/st.

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Original Suckless' README
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st - simple terminal
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st is a simple terminal emulator for X which sucks less.


Requirements
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In order to build st you need the Xlib header files.


Installation
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Edit config.mk to match your local setup (st is installed into
the /usr/local namespace by default).

Afterwards enter the following command to build and install st (if
necessary as root):

    make clean install


Running st
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If you did not install st with make clean install, you must compile
the st terminfo entry with the following command:

    tic -sx st.info

See the man page for additional details.

Credits
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Based on Aurélien APTEL <aurelien dot aptel at gmail dot com> bt source code.