The problem is the gcc compiler versión. You must compile stamps with gcc v7
To Installing Multiple GCC Versions follow this link:
https://linuxize.com/post/how-to-install-gcc-compiler-on-ubuntu-18-04/
then select the gcc-7
“sudo update-alternatives --config gcc” select the correct one
check gcc version (command: gcc -v)
and then install stmaps (go to src and “make” “make install”)