我在尝试构建rust程序时遇到了错误failed to run custom build command for openssl-sys v0.9.60。下面是main.rs和Cargo.toml文件。
main.rs

extern crate reqwest;

fn main() {
    let mut resp = reqwest::get("http://www.governo.mg.gov.br/Institucional/Equipe").unwrap();
    assert!(resp.status().is_success());
}

Cargo.toml

[package]
name = "get_sct"
version = "0.1.0"
authors = ["myname <myemail>"]
edition = "2018"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
reqwest = "0.10.10"

我在本地安装了openssl（如question中所建议的），使用的是：

git clone git://git.openssl.org/openssl.git
cd openssl
./config --openssldir=/usr/local/ssl
make
make test
sudo make install

最后，我运行了export OPENSSL_DIR="/usr/local/ssl"
我注意到我已经有了一个openssl的anaconda安装，它在我的默认路径中。为了将openssl的默认路径更改为github安装，我运行了chmod -x MYPATH/anaconda3/bin/openssl，现在which openssl返回/usr/local/bin/openssl。
我还安装了pkg-config（按照此question中的建议）。运行which pkg-config返回/usr/bin/pkg-config
然而，当我再次运行cargo run时，程序打印出相同的错误信息。以下是完整的错误信息：

> cargo run
   Compiling openssl-sys v0.9.60
   Compiling tokio v0.2.24
   Compiling pin-project-internal v0.4.27
   Compiling pin-project-internal v1.0.2
   Compiling mime_guess v2.0.3
   Compiling url v2.2.0
error: failed to run custom build command for `openssl-sys v0.9.60`

Caused by:
  process didn't exit successfully: `/PACKAGEPATH/target/debug/build/openssl-sys-db18d493257de4f7/build-script-main` (exit code: 101)
  --- stdout
  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 = /usr/local/ssl

  --- stderr
  thread 'main' panicked at 'OpenSSL library directory does not exist: /usr/local/ssl/lib', /home/lucas/.cargo/registry/src/github.com-1ecc6299db9ec823/openssl-sys-0.9.60/build/main.rs:66:9
  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
warning: build failed, waiting for other jobs to finish...
error: build faile

看起来那个rust在/usr/local/ssl/lib中搜索ssl，事实上我的PC中有一个/usr/local/ssl文件夹，但那里没有lib。
我在这里做错了什么？怎样才能让我的openssl本地安装与rust正确工作？