Merge pull request #231 from SPYFF/build-note-debian

note: Mention gcc-multilib as possible dependency

docs/install/build.mdx

@@ -70,18 +70,33 @@ Required dependencies:
   * `libadwaita`
   * `pkg-config`
 
-On Ubuntu and Debian, use:
+#### Arch Linux
 
 ```sh
-sudo apt install libgtk-4-dev libadwaita-1-dev git
+sudo pacman -S gtk4 libadwaita
 ```
 
-On Arch Linux, use
+#### Debian and Ubuntu
 
 ```sh
-sudo pacman -S gtk4 libadwaita
+sudo apt install libgtk-4-dev libadwaita-1-dev git
 ```
 
+On Debian unstable/testing, the `gcc-multilib` package is also required
+for building.
+
+<Note>
+**A recent GTK is required for Ghostty to work with Nvidia (GL) drivers
+under x11.** Ubuntu 22.04 LTS has GTK 4.6 which is not new enough. Ubuntu 23.10
+has GTK 4.12 and works. From [this discussion](https://discourse.gnome.org/t/opengl-context-version-not-respected-on-gtk4-rs/12162?u=cdehais)
+the problem was fixed in GTK by Dec 2022. Also, if you are a BTRFS user, make
+sure to manually upgrade your Kernel (6.6.6 will work). The stock kernel in
+Ubuntu 23.10 is 6.5.0 which has a bug which
+[causes zig to fail its hash check for packages](https://github.com/ziglang/zig/issues/17282).
+</Note>
+
+#### Fedora
+
 On Fedora variants, use
 
 ```sh
@@ -94,33 +109,24 @@ On Fedora Atomic variants, use
 rpm-ostree install gtk4-devel zig libadwaita-devel
 ```
 
-On Gentoo, use
+#### Gentoo
+
 ```sh
 emerge -av libadwaita gtk
 ```
 
-On Solus, use
+#### openSUSE Tumbleweed
 
 ```sh
-sudo eopkg install libgtk-4-devel libadwaita-devel perl-extutils-pkgconfig
+sudo zypper install gtk4-tools libadwaita-devel pkgconf-pkg-config zig
 ```
 
-On OpenSuse Tumbleweed, use
+#### Solus
 
 ```sh
-sudo zypper install gtk4-tools libadwaita-devel pkgconf-pkg-config zig
+sudo eopkg install libgtk-4-devel libadwaita-devel perl-extutils-pkgconfig
 ```
 
-<Note>
-**A recent GTK is required for Ghostty to work with Nvidia (GL) drivers
-under x11.** Ubuntu 22.04 LTS has GTK 4.6 which is not new enough. Ubuntu 23.10
-has GTK 4.12 and works. From [this discussion](https://discourse.gnome.org/t/opengl-context-version-not-respected-on-gtk4-rs/12162?u=cdehais)
-the problem was fixed in GTK by Dec 2022. Also, if you are a BTRFS user, make
-sure to manually upgrade your Kernel (6.6.6 will work). The stock kernel in
-Ubuntu 23.10 is 6.5.0 which has a bug which
-[causes zig to fail its hash check for packages](https://github.com/ziglang/zig/issues/17282).
-</Note>
-
 <Warning>
 GTK 4.14 on Wayland has a bug which may cause an immediate crash.
 There is an