Compilation error: Unable to detect OpenSSL version

[sbstp]

Running into an error while trying to compile a project that uses reqwest, my ~/.cargo/config only contains my crates.io access token, nothing else.

$ cargo build --release
   Compiling openssl v0.9.24                                                                                                                                                                                       
   Compiling openssl-sys v0.9.35
error: failed to run custom build command for `openssl v0.9.24`
process didn't exit successfully: `/home/simon/projects/tinyhttp/compare-tests/cat-reqwest/target/release/build/openssl-10d568e63f64a017/build-script-build` (exit code: 101)
--- stderr
thread 'main' panicked at 'Unable to detect OpenSSL version', /home/simon/.cargo/registry/src/github.com-1ecc6299db9ec823/openssl-0.9.24/build.rs:16:14
note: Run with `RUST_BACKTRACE=1` for a backtrace.

warning: build failed, waiting for other jobs to finish...
error: build failed

I have another library using native-tls 0.2.1 and it compiles just fine.

• cargo tree of the problematic project
• cargo tree of the working project

I'm using Debian sid, the libssl-dev package is

Package: libssl-dev
Source: openssl
Version: 1.1.1~~pre9-1
Installed-Size: 7883
Maintainer: Debian OpenSSL Team <pkg-openssl-devel@lists.alioth.debian.org>
Architecture: amd64
Depends: libssl1.1 (= 1.1.1~~pre9-1)
Suggests: libssl-doc
Conflicts: libssl1.0-dev
Description-en: Secure Sockets Layer toolkit - development files
 This package is part of the OpenSSL project's implementation of the SSL
 and TLS cryptographic protocols for secure communication over the
 Internet.
 .
 It contains development libraries, header files, and manpages for libssl
 and libcrypto.
Description-md5: 27044468897c45b271f879c7c6e135fe
Multi-Arch: same
Homepage: https://www.openssl.org/
Tag: devel::lang:c, devel::library, implemented-in::TODO, implemented-in::c,
 protocol::ssl, role::devel-lib, security::cryptography
Section: libdevel
Priority: optional
Filename: pool/main/o/openssl/libssl-dev_1.1.1~~pre9-1_amd64.deb
Size: 1783684
MD5sum: 82d9d2664f30fc97b8a5de64f0e0cfe1
SHA256: 66195648825d33db19f8c0e225d638f13d14230de6adbbf2489d6be072e4c45a

[sfackler]

openssl 0.9 doesn't support OpenSSL 1.1.1. You'll need to update to openssl 0.10.

[sbstp]

So I'd have to bring this up upstream to reqwest? Does openssl 0.10 support OpenSSL < 1.1.1? I don't want to cause breakage.

[sfackler]

Yep, 0.10 supports OpenSSL 1.0.1 and newer.