Does not build with openssl 1.1.1

[jonhoo]

oauth-client currently depends on reqwest 0.8, which depends on hyper-tls 0.1, which again depends on native-tls 0.1, which pulls in openssl 0.9.24, which doesn't build with the most recent version of openssl (sfackler/rust-openssl#994). There are a few open PRs (#34 and #35) that bump the version of reqwest to 0.9, which doesn't have this problem, so merging one of them might be the right way to move forward! Until then, we're sadly locked in a situation where the crate doesn't build :'(

[kallisti5]

@gifnksm Any chance you can merge @jonhoo 's pull requests? This Crate seems abandoned.
@jonhoo any interest in forking :-)

[kallisti5]

PR #36 seems like a great one that adds futures and fixes this issue as well.

[mcarpenter]

Ubuntu 18 furnishes OpenSSL 1.1.1 so also runs afoul of this issue.

Here is a workaround to compile against OpenSSL 1.0.2 until a new release is made:

cd /tmp
wget https://www.openssl.org/source/openssl-1.0.2u.tar.gz
tar xf openssl-1.0.2u.tar.gz
cd openssl-1.0.2u
mkdir ~/openssl-1.0.2u
./Configure --prefix=~/openssl-1.0.2u linux-generic64
make -j8 
make install
~/openssl-1.0.2u/bin/openssl version # check okay

cd ~/my-rust-project
export OPENSSL_INCLUDE_DIR=~/openssl-1.0.2u/include
export OPENSSL_LIB_DIR=~/openssl-1.0.2u/lib
cargo build

SSL_CERT_DIR=/etc/ssl/certs ./target/debug/my-rust-project # else will look in ~/openssl-1.0.2u/ssl/cert.pem

[gifnksm]

I'm sorry for begin late.
reqwest is upgraded to 0.10 via #39, so this issue should be fixed.

If you have any problem with oauth-client-rs v0.4.1, please reopen this issue or file a new issue.