I am running Damn Small Linux in VirtualBox.
I have Thunderbird downloaded (thunderbird-18.104.22.168.tar.gz) into my home/dsl folder. I have it unpacked and it ended up in /home/dsl/thunderbird directory.
When I run ./configure I get "command not found" but every tutorial I can find says to use this command after unpacking the tarball into its own directory. What am I doing wrong to install Thunderbird?