Add basic linux build instructions

Signed-off-by: Rye <[email protected]>

Author: RyeMutt

doc/BUILD.LINUX.md

@@ -0,0 +1,79 @@
+# Building on Linux
+
+## Install Dependencies
+
+### AlmaLinux 10
+```
+sudo dnf group install "Development Tools"
+sudo dnf install cmake fontconfig-devel git glib2-devel gstreamer1-devel gstreamer1-plugins-base-devel libX11-devel mesa-libOSMesa-devel libglvnd-devel ninja-build python3 vlc-devel wayland-devel
+```
+> [!NOTE]
+> You may need to enable the EPEL repository for some packages `sudo dnf install epel-release`
+
+### Arch
+```
+sudo pacman -Syu base-devel cmake fontconfig git glib2-devel gstreamer gst-plugins-base-libs ninja libglvnd libvlc libx11 python wayland
+```
+
+### Debian - Ubuntu 22.04 - Ubuntu 24.04
+```
+sudo apt install build-essential cmake git libfontconfig-dev libglib2.0-dev libglvnd-dev libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev libosmesa6-dev libvlc-dev libwayland-dev libx11-dev ninja-build python3 python3-venv
+```
+
+### Fedora
+```
+sudo dnf install @development-tools @c-development cmake fontconfig-devel git glib-devel gstreamer1-devel gstreamer1-plugins-base-devel libX11-devel mesa-compat-libOSMesa-devel libglvnd-devel ninja-build python3 vlc-devel wayland-devel
+```
+
+### OpenSUSE Tumbleweed
+```
+sudo zypper in -t pattern devel_basis devel_C_C++
+sudo zypper install cmake fontconfig-devel git glib2-devel gstreamer-devel gstreamer-plugins-base-devel libglvnd-devel libX11-devel ninja Mesa-libGL-devel python3 vlc-devel wayland-devel
+```
+
+## Create development folders
+```
+mkdir -p ~/code/secondlife
+cd ~/code/secondlife
+```
+
+## Setup Virtual Environment and install Autobuild
+```
+python3 -m venv .venv
+source .venv/bin/activate
+pip install autobuild llsd
+```
+> [!NOTE]
+> If the above was successful you should receive output similar to `autobuild 3.10.2` when running `autobuild --version`
+
+## Setup Build Variables
+```
+git clone https://github.com/secondlife/build-variables.git
+export AUTOBUILD_VARIABLES_FILE=~/code/secondlife/build-variables/variables
+```
+
+## Clone Viewer
+```
+git clone https://github.com/secondlife/viewer.git
+cd ~/code/secondlife/viewer
+```
+
+## Configure Viewer
+
+### GCC
+```
+autobuild configure -c ReleaseOS -A64
+```
+
+### Clang
+```
+autobuild configure -c ReleaseOS -- -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ -DCMAKE_LINKER_TYPE=LLD
+```
+
+## Build Viewer
+```
+autobuild build -c ReleaseOS --no-configure
+```
+
+> [!NOTE]
+> If the above was successful you should find the viewer package in `viewer/build-linux-x86_64/newview`