OpenSSL not found on Ubuntu

[SuperCuber]

error: failed to run custom build command for `openssl-sys v0.9.20`
process didn't exit successfully: `/tmp/cargo-install.KbMJWtJ6KkZ4/release/build/openssl-sys-4bbdcf8b48309c22/build-script-build` (exit code: 101)
--- stdout
cargo:rerun-if-env-changed=X86_64_UNKNOWN_LINUX_GNU_OPENSSL_LIB_DIR
cargo:rerun-if-env-changed=OPENSSL_LIB_DIR
cargo:rerun-if-env-changed=X86_64_UNKNOWN_LINUX_GNU_OPENSSL_INCLUDE_DIR
cargo:rerun-if-env-changed=OPENSSL_INCLUDE_DIR
cargo:rerun-if-env-changed=X86_64_UNKNOWN_LINUX_GNU_OPENSSL_DIR
cargo:rerun-if-env-changed=OPENSSL_DIR
run pkg_config fail: "`\"pkg-config\" \"--libs\" \"--cflags\" \"openssl\"` did not exit successfully: exit code: 1\n--- stderr\nPackage openssl was not found in the pkg-config search path.\nPerhaps you should add the directory containing `openssl.pc\'\nto the PKG_CONFIG_PATH environment variable\nNo package \'openssl\' found\n"

--- stderr
thread 'main' panicked at '

Could not find directory of OpenSSL installation, and this `-sys` crate cannot
proceed without this knowledge. If OpenSSL is installed and this crate had
trouble finding it,  you can set the `OPENSSL_DIR` environment variable for the
compilation process.

If you're in a situation where you think the directory *should* be found
automatically, please open a bug at https://github.com/sfackler/rust-openssl
and include information about your system as well as this message.

    $HOST = x86_64-unknown-linux-gnu
    $TARGET = x86_64-unknown-linux-gnu
    openssl-sys = 0.9.20

', .cargo/registry/src/github.com-1ecc6299db9ec823/openssl-sys-0.9.20/build.rs:210:4
note: Run with `RUST_BACKTRACE=1` for a backtrace.

[sfackler]

Do you have libssl-dev installed?

[SuperCuber]

After installing libssl-dev it works. Thanks!

[95th]

I am running Ubuntu on WSL and have libssl-dev installed. I am still getting the error:

cargo:rustc-cfg=const_fn
cargo:rerun-if-env-changed=X86_64_UNKNOWN_LINUX_GNU_OPENSSL_LIB_DIR
X86_64_UNKNOWN_LINUX_GNU_OPENSSL_LIB_DIR unset
cargo:rerun-if-env-changed=OPENSSL_LIB_DIR
OPENSSL_LIB_DIR unset
cargo:rerun-if-env-changed=X86_64_UNKNOWN_LINUX_GNU_OPENSSL_INCLUDE_DIR
X86_64_UNKNOWN_LINUX_GNU_OPENSSL_INCLUDE_DIR unset
cargo:rerun-if-env-changed=OPENSSL_INCLUDE_DIR
OPENSSL_INCLUDE_DIR unset
cargo:rerun-if-env-changed=X86_64_UNKNOWN_LINUX_GNU_OPENSSL_DIR
X86_64_UNKNOWN_LINUX_GNU_OPENSSL_DIR unset
cargo:rerun-if-env-changed=OPENSSL_DIR
OPENSSL_DIR unset
run pkg_config fail: "Failed to run `\"pkg-config\" \"--libs\" \"--cflags\" \"openssl\"`: No such file or directory (os error 2)"

--- stderr
thread 'main' panicked at '

Could not find directory of OpenSSL installation, and this `-sys` crate cannot
proceed without this knowledge. If OpenSSL is installed and this crate had
trouble finding it,  you can set the `OPENSSL_DIR` environment variable for the
compilation process.

Make sure you also have the development packages of openssl installed.
For example, `libssl-dev` on Ubuntu or `openssl-devel` on Fedora.

If you're in a situation where you think the directory *should* be found
automatically, please open a bug at https://github.com/sfackler/rust-openssl
and include information about your system as well as this message.

$HOST = x86_64-unknown-linux-gnu
$TARGET = x86_64-unknown-linux-gnu
openssl-sys = 0.9.47


It looks like you're compiling on Linux and also targeting Linux. Currently this
requires the `pkg-config` utility to find OpenSSL but unfortunately `pkg-config`
could not be found. If you have OpenSSL installed you can likely fix this by
installing `pkg-config`.

', /home/95th/.cargo/registry/src/github.com-1ecc6299db9ec823/openssl-sys-0.9.47/build/find_normal.rs:150:5

[SuperCuber]

@95th
From the error:

If you have OpenSSL installed you can likely fix this by installing `pkg-config`.

Do you have it installed?

[95th]

It wasn't 😬. But installing it worked.

[floratmin]

If you have pkg-config already installed then setting the path to the file openssl.pc helped. For me this was:
export PKG_CONFIG_PATH=/usr/lib/x86_64-linux-gnu/pkgconfig

[banool]

For me I was able to skirt around the issue by doing this.

First, figure out what openssl crate version we're relying on:

$ cargo tree --target=x86_64-unknown-linux-musl -i openssl-sys | grep openssel
openssl-sys v0.9.74
└── openssl v0.10.40

Then add something like this to your Cargo.toml:

openssl = { version = "0.10.40", features = ["vendored"] }

[dzmitry-lahoda]

I followed all steps, cannot do last as it deps of deps. Restarted shell, not worked. So will use OPENSSL_DIR directly

[gordug]

Do you have libssl-dev installed?

This should be a hint in the error