I am trying to install horovod. At around 66% of installation I am getting error:

In file included from /usr/include/host_config.h:50,
from /usr/include/cuda_runtime.h:78,
from :
/usr/include/crt/host_config.h:121:2: error: #error -- unsupported GNU version! gcc versions later than 6 are not supported!
121 | #error -- unsupported GNU version! gcc versions later than 6 are not supported!
| ^~~~~
In file included from /usr/include/driver_types.h:72,
from /usr/include/builtin_types.h:59,
from /usr/include/cuda_runtime.h:86,
from :
/usr/include/limits.h:26:10: fatal error: bits/libc-header-start.h: No such file or directory
26 | #include <bits/libc-header-start.h>
| ^~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
CMake Error at horovod_cuda_kernels_generated_cuda_kernels.cu.o.RelWithDebInfo.cmake:220 (message):
Error generating
/tmp/pip-install-l0oxred5/horovod_c2af735b5baf4bb78a32f78a8e466319/build/temp.linux-x86_64-3.7/RelWithDebInfo/horovod/common/ops/cuda/CMakeFiles/horovod_cuda_kernels.dir//./horovod_cuda_kernels_generated_cuda_kernels.cu.o

I am using Pop!_OS 18.04 LTS. I can not find any option to give the path to GCC 6 in installation command. Please let me know if more information is required.