That error is occurring when trying to generate the configure script for vkd3d. Do you have libtool installed?
This error occurs when I try to build the package with make. Yes, I got another error before, that basically said I should install libtool and so I did it.
proton 5.0x1 2020-04proton 5.0-5bx1 2020-04
Proton Version: commit 80d70143334871c29474eb0c329e6eb52e8c396b (HEAD -> proton_5.0, tag: proton-5.0-5b
I tried to install proton on my Ubuntu 19.10. The steam runtime was installed successfully but the compilation of proton failed. I am using fish shell but I tried to execute it in a bash environment and it still didn't work.
I followed the build instructions as follows
OS: Ubuntu 19.10
GNOME Shell 3.34.3
sh: fish, version 3.0.2