Undefined reference errors when trying to build ldas-tools-framecpp

I'm seeing the following errors when trying to build ldas-tools-framecpp-2.6.2 under Conda on debian/stretch:

/root/opt/miniconda3/conda-bld/ldas-tools-framecpp_1538660686679/_build_env/bin/../lib/gcc/x86_64-conda_cos6-linux-gnu/7.3.0/../../../../x86_64-conda_cos6-linux-gnu/bin/ld: /root/opt/miniconda3/conda-bld/ldas-tools-framecpp_1538660686679/work/src/Common/.libs/libframecppcmn.so: undefined reference to `LDASTools::System::ErrnoMessage[abi:cxx11]()'

I have no idea what this means, or how to diagnose, so any help is greatly appreciated.