Build of of agents base container failing

[cwbeitel]

Currently $WORKSPACE/tools/base/build.sh agents yields the following (truncated) without any known changes to Dockerfile since last build:

...
    /usr/lib/gcc/x86_64-linux-gnu/5/cc1: error while loading shared libraries: /usr/lib/x86_64-linux-gnu/libmpc.so.3: invalid ELF header
    error: command 'x86_64-linux-gnu-gcc' failed with exit status 1

    ----------------------------------------
Command "/usr/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-iVwPFi/pybullet/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /tmp/pip-3r6r0P-record/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /tmp/pip-build-iVwPFi/pybullet/
The command '/bin/sh -c pip install pybullet==1.7.5' returned a non-zero code: 1