fix issue 1, not running on old linux distros

Dockerfile

@@ -1,14 +1,17 @@
 ## Author: Nelson E Hernandez
 ## Date:
-FROM debian:latest
+FROM centos:centos6.9
 ## install build tools
-RUN apt-get update && apt-get install -y autotools-dev automake git build-essential wget fuse file
+RUN /usr/bin/yum groupinstall -y "Development Tools"
+RUN /usr/bin/yum install -y wget
 
-RUN wget https://github.com/linuxdeploy/linuxdeploy/releases/download/continuous/linuxdeploy-x86_64.AppImage && \
-    chmod +x linuxdeploy-x86_64.AppImage && mv linuxdeploy-x86_64.AppImage /usr/bin/linuxdeploy
+RUN wget https://github.com/linuxdeploy/linuxdeploy/releases/download/continuous/linuxdeploy-x86_64.AppImage \
+    && chmod +x linuxdeploy-x86_64.AppImage \
+    && ./linuxdeploy-x86_64.AppImage --appimage-extract \
+    && ln -nfs /squashfs-root/usr/bin/linuxdeploy /usr/bin/linuxdeploy
 
 ## install tmux specific packages
-RUN apt-get install -y libevent-dev libncurses5-dev libncursesw5-dev bison byacc pkg-config
+RUN yum install -y libevent2-devel.x86_64 ncurses-devel
 
 ## Change RELEASE_TAG to desired version/git sha
 ENV RELEASE_TAG=3.0a

README.md

@@ -3,7 +3,7 @@
 ### What is this?
 Dockerfile to create an AppImage of tmux.
 
-### Why use docker?
+### Why use Docker?
 The advantages to doing it this way are:
 - Obtain consistent build results on any computer.
 - No need to install a slew of build packages on your own machine.
@@ -14,22 +14,35 @@ The advantages to doing it this way are:
 ## clone me
 git clone https://github.com/nelsonenzo/tmux-appimage.git
 
-## compile tmux
+## compile tmux from source by building container
 docker build . -t tmux
 
-## make appimage
-docker run -it --cap-add SYS_ADMIN --cap-add MKNOD --device /dev/fuse:mrw -v "$PWD"/opt:/opt tmux
+## make appimage by running container
+docker run -it -v "$PWD"/opt:/opt tmux
 
-## move appimage to executable location in your $PATH
+## expected output:
+./opt/releases/tmux-3.0a-x86_64.AppImage
+```
+
+
+## To use AppImage
+move appimage to executable location in your $PATH
+```
 mv ./opt/releases/tmux.*AppImage /usr/bin/tmux
 
 tmux
 ```
 
-### Will it only run on Debian?
-I suspect the tmux binary is very portable and this build will work on multiple Linux variants, but I have only tested it on Debian based distros so far. When I have tested on other distros I will remove this message.
+### Where has the AppImage been tested to turn?
+It has been tested on these fine Linux platforms and will likely work for anything newer than centos 6.9 (which is a few years old now.) Please file an issue if you find otherwise or need support on a different platform.
+```
+ubuntu 18
+centos 6.9
+centos 7.6
+fedora 31
+```
 
 ### What is the sauce that makes this work?
 The [Dockerfile](Dockerfile) contains all the magic ingredients to compile tmux.
 
-[opt/build.sh](opt/build.sh) creates the AppImage.
+[./opt/build.sh](opt/build.sh) creates the AppImage from binary using linuxdeploy tool.

opt/build.sh

@@ -1,6 +1,11 @@
 #!/bin/bash
 mkdir /opt/releases
+
 cd /tmux
 
-export OUTPUT="/opt/releases/tmux-debian-$RELEASE_TAG-x86_64.AppImage"
-/usr/bin/linuxdeploy --appdir=AppDir -i /opt/tmux-logo-square.png -d /opt/tmux.desktop -e MakeBuild/bin/tmux --output=appimage
+export OUTPUT="/opt/releases/tmux-$RELEASE_TAG-x86_64.AppImage"
+
+/usr/bin/linuxdeploy --appdir=AppDir \
+  -i /opt/tmux-logo-square.png \
+  -d /opt/tmux.desktop \
+  -e MakeBuild/bin/tmux --output=appimage