@Nitesh thanks for your question! Ah I think perhaps we might not be forwarding the CMAKE_C_COMPILER flag onward to the Makefile used to build the TVM C runtime. This likely leads to your linker error.
Could you try adding an appropriate line here? e.g. CC=${CMAKE_C_COMPILER} and the same for CXX and AR. Feel free to raise a PR if you discover a fix.
Thanks! Andrew