doc: Add `INSTALL.md` to Linux release tarballs

contrib/guix/libexec/build.sh

@@ -301,6 +301,7 @@ mkdir -p "$DISTSRC"
                 ;;
             *linux*)
                 cp "${DISTSRC}/README.md" "${DISTNAME}/"
+                cp "${DISTSRC}/doc/INSTALL_linux.md" "${DISTNAME}/INSTALL.md"
                 ;;
         esac
 

doc/INSTALL_linux.md

@@ -0,0 +1,68 @@
+Bitcoin Core
+=============
+
+Below are notes on installing Bitcoin Core software on Linux systems.
+
+General Runtime Requirements
+----------------------------
+
+Bitcoin Core requires glibc (GNU C Library) 2.31 or newer.
+
+GUI Runtime Requirements
+------------------------
+
+The GUI executable, `bitcoin-qt`, is based on the Qt 6 framework and uses the `xcb` QPA (Qt Platform Abstraction) platform plugin
+to run on X11. Its runtime library [dependencies](https://doc.qt.io/archives/qt-6.7/linux-requirements.html) are as follows:
+- `libfontconfig`
+- `libfreetype`
+- `libxcb`
+- `libxcb-icccm`
+- `libxcb-image`
+- `libxcb-keysyms`
+- `libxcb-randr`
+- `libxcb-render`
+- `libxcb-render-util`
+- `libxcb-shape`
+- `libxcb-shm`
+- `libxcb-sync`
+- `libxcb-xfixes`
+- `libxcb-xkb`
+- `libxkbcommon`
+- `libxkbcommon-x11`
+
+On Debian, Ubuntu, or their derivatives, you can run the following command to ensure all dependencies are installed:
+```sh
+sudo apt install \
+  libfontconfig1 \
+  libfreetype6 \
+  libxcb1 \
+  libxcb-icccm4 \
+  libxcb-image0 \
+  libxcb-keysyms1 \
+  libxcb-randr0 \
+  libxcb-render0 \
+  libxcb-render-util0 \
+  libxcb-shape0 \
+  libxcb-shm0 \
+  libxcb-sync1 \
+  libxcb-xfixes0 \
+  libxcb-xkb1 \
+  libxkbcommon0 \
+  libxkbcommon-x11-0
+```
+
+On Fedora, run:
+```sh
+sudo dnf install \
+  fontconfig \
+  freetype \
+  libxcb \
+  libxkbcommon \
+  libxkbcommon-x11 \
+  xcb-util-image \
+  xcb-util-keysyms \
+  xcb-util-renderutil \
+  xcb-util-wm
+```
+
+For other systems, please consult their documentation.