===> Skipping vulnerability checks.
WARNING: No /usr/pkg/pkgdb/pkg-vulnerabilities file found.
WARNING: To fix run: `/usr/sbin/pkg_admin -K /usr/pkg/pkgdb fetch-pkg-vulnerabilities'.
===> Building for rex-0.2.7
   Compiling proc-macro2 v1.0.106
   Compiling quote v1.0.45
   Compiling unicode-ident v1.0.24
   Compiling libc v0.2.185
   Compiling syn v2.0.117
error: failed to run custom build command for `libc v0.2.185`

Caused by:
  process didn't exit successfully: `/pbulk/work/finance/rex/work/Rex-0.2.7/target/release/build/libc-03dc5b8c36093d0d/build-script-build` (exit status: 101)
  --- stdout
  cargo:rerun-if-changed=build.rs

  --- stderr

  thread 'main' (4569) panicked at /pbulk/work/finance/rex/work/vendor/libc-0.2.185/build.rs:217:31:
  Failed to get rustc version: Os { code: 2, kind: NotFound, message: "No such file or directory" }
  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
*** Error code 101

Stop.
make[1]: stopped in /usr/pkgsrc/finance/rex
*** Error code 1

Stop.
make: stopped in /usr/pkgsrc/finance/rex