pgp-ffi not building anymore

[Jikstra]

I'm currently getting this error on all ci/local deb building scripts:

Step 12/12 : RUN true     && cd /rpgp/pgp-ffi     && PREFIX=/opt/DeltaChat/rpgp make install
 ---> Running in 76480efd4de7
cd /rpgp/pgp-ffi/../ && RUSTFLAGS="-C codegen-units=1" cargo build --release --features nightly -p pgp_ffi
    Updating crates.io index
error: no matching package named `pgp` found
location searched: /rpgp
perhaps you meant: pgp
required by package `pgp_ffi v0.1.0 (/rpgp/pgp-ffi)`
make: *** [build-stamp] Error 101
Makefile:45: recipe for target 'build-stamp' failed
The command '/bin/sh -c true     && cd /rpgp/pgp-ffi     && PREFIX=/opt/DeltaChat/rpgp make install' returned a non-zero code: 2

What's the correct way to build and install rpgp? We should maybe also put that in the README.

[ralphtheninja]

Where are these lines from?