Cannot compile a new lfe project due to header inclusion problem.

Error that I am seeing:
```
./rebar3 lfe repl
===> Verifying dependencies...
===> Compiling _build/default/lib/ltest/src/ltest.lfe failed
/Users/user/Projects/lfe-proj/_build/default/lib/ltest/src/ltest.lfe:4: can't find include lib include/ltest-macros.lfe
```

This is on a fresh lfe project generated by rebar3.