Fyi, for anyone getting the same message and then having trouble compiling - i was adding the dependency to a pod created for use in a few downstream apps.  I found that I needed to add the following to the “Other Linker Flags” in those downstream projects for it to compile:
--force_load "<path to pod folder>/LibTorch-Lite/install/lib/libtorch.a" --force_load "<path to pod folder>/LibTorch-Lite/install/lib/libtorch_cpu.a"
Hope that helps anyone else running into the issue.