Can't build a static executable

Static executables are great for easy deployment in air gapped machines, like a laptop running Tails, so I think they should be supported, if not the default.
I tried to build using something like `CFLAGS="-static" CXXFLAGS="-static" LDFLAGS="-static" ./build.sh`, but it fails because `libgcc_s.a` doesn't exist, only `libgcc_s.so`.