Re: Error in package building : error[E0463]: can't find crate for `openssl_src`

["Hamzeh Nasajpour" <h.nasajpour@pantherx.org>]

This is my package definition till now. The repository of the package is here:
https://github.com/etesync/etebase-py/

Also I should to say I package these (since they aren't available in the upstream packages):
* openssl@0.10.30
* cpython@0.3
* etebase-rs
* flapigen-0.6

I didn't attach them here for simplicity.

```
(define-public python-etebase-py
  (package
    (name "python-etebase-py")
    (version "0.30.0")
    (source
      (origin
        (method url-fetch)
        (uri (pypi-uri "etebase" version))
        (sha256
          (base32
            "1py635aqnxx3jy4x6zffriqi0l9gc2gk06h0ms91k4rs68h0gb0i"))
        (modules '((guix build utils)))
        (snippet
         '(begin
            (substitute* "Cargo.toml"
              (("etebase = " all) "#etebase = "))
            (substitute* "Cargo.toml"
              (("flapigen = " all) "flapigen = \"^0.6.0-pre7\" #"))
            (substitute* "Cargo.toml"
              (("0.10.30\"" all) "0.10.30\"}# "))
            #t))))
    (build-system cargo-build-system)
    (arguments
      `(#:tests? #f
        #:cargo-inputs
        (("rust-openssl" ,rust-openssl-0.10)
         ("rust-cpython" ,rust-cpython-0.3)
         ("rust-log" ,rust-log-0.4)
         ("rust-etebase-rs" ,rust-etebase-rs)
         ("rust-flapigen" ,rust-flapigen-0.6)
         ("rust-env-logger" ,rust-env-logger-0.7))
        #:phases
         (modify-phases %standard-phases
           (add-after 'unpack 'patch-env-var
			(lambda* (#:key inputs #:allow-other-keys)
             (let ((openssl (assoc-ref inputs "openssl")))
               (invoke "rm" "setup.py")
               (setenv "RUST_BACKTRACE" "full")
               (setenv "OPENSSL_DIR" openssl))
             #t))
             )))
    (native-inputs
      `(("openssl" ,openssl)
        ("python-msgpack" ,python-msgpack)
        ("python-setuptools-rust" ,python-setuptools-rust)))
    (inputs
      `(("python" ,python)
;        ("rust-etebase-rs" ,rust-etebase-rs)
        ))
    (home-page "https://github.com/etesync/etebase-rs")
    (synopsis "A python client library for EteSync.")
    (description
              "This module provides a python API to interact with an EteSync server. 
It currently implements AddressBook and Calendar access, and supports two-way sync (both push and pull) to the server.")
    (license license:gpl3)))
```