Copy lwjgl binaries into the linux natives jar file for minecraft.

copy_lwjgl.sh

#!/bin/bash

# This script will copy the newly compiled lwjgl.so and libopenal.so 
# from the specified directory into the correct minecraft jar file.
# It will then compute and update the correct sha1sum.
#
# First Arguement (Required): 
#    Path to the directory containing:
#    lwjgl.so and libopenal.so
# 
# Second Arguement (Optional):
#    Path to the directory containing:
#    liwjgl-platform-2.9.1-natives-linux.jar and 
#    liwjgl-platform-2.9.1-natives-linux.jar.sha 
#
# Example usage
# copy_lwjgl.sh ~/Minecraft/Natives
# or 
# copy_lwjgl.sh ~/Minecraft/Natives ~/.minecraft/libraries/org/lwjgl/lwjgl/lwjgl-platform/2.9.1

if [ -z "$1" ]; then
	echo "Error, Need at least one arguement."
	exit -1
else
	MINECRAFT_NATIVE_PATH=$1
fi

if [ -z "$2" ]; then
  MINECRAFT_LWJGL_PATH=~/.minecraft/libraries/org/lwjgl/lwjgl/lwjgl-platform/2.9.1
else
  MINECRAFT_LWJGL_PATH=$2
fi

zip -j "$MINECRAFT_LWJGL_PATH/lwjgl-platform-2.9.1-natives-linux.jar" \
  "$MINECRAFT_NATIVE_PATH/liblwjgl.so" \
  "$MINECRAFT_NATIVE_PATH/libopenal.so"

SHA1_SUM=$(sha1sum "$MINECRAFT_LWJGL_PATH/lwjgl-platform-2.9.1-natives-linux.jar" --tag | awk '{print $4}')

echo "New sha1sum: $SHA1_SUM"
echo $SHA1_SUM > "$MINECRAFT_LWJGL_PATH/lwjgl-platform-2.9.1-natives-linux.jar.sha"

The platform version has changed. I modified the script to detect the version automatically. It seems to work. I'm getting an exception in libxrandr, though.

I've had to tweak your script for recent installs of minecraft as the target JAR depends on the path

For details see https://github.com/steven-ellis/HP_ARM_Chromebook_Linux/blob/master/Minecraft/bin/copy_lwjgl.sh

I've tweaked this again (barely) to work with minecraft 1.10, with modded caveat.
https://gist.github.com/DrDaymaker/ce0c9cf7434f42d4e0d2e25a562346f3

This was working for me on an ASUS Flip Chromebook in XFCE4 via Crouton, but now it no longer does. I'm on launcher version 1.6.70, which I think updated around the time the 1.11 update came out.