Thank you for your help. Installing the
glibc.i686 package fixed the
arm-none-eabi-gcc part of the problem, but I also had to install
vim-common to provide the
xxd command, and
perl-Archive-Zip-1.58-1.fc24.noarch to provide to
crc32 command. Installing these 3 extra packages makes po-util work perfectly on my Fedora virtual machine.
I suspect that to fix the problem on Arch, I will have to install something like
pacman and installing
yaourt worked for Arch.
libc6-i386 package on Ubuntu fixes the problem for Travis CI.
I have added these packages to the installation part of po-util, and it should now work on all of these distributions.
arm-none-eabi-gcc requires the 32bit libraries for C.