Import subrepo pkg-config/:pkg-config at a493b0d7c93df68c94d1bad2a1f419389e52c0f5

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+# pkg-config-rs
+
+[![Build Status](https://travis-ci.org/alexcrichton/pkg-config-rs.svg?branch=master)](https://travis-ci.org/alexcrichton/pkg-config-rs)
+
+[Documentation](http://alexcrichton.com/pkg-config-rs)
+
+A simple library meant to be used as a build dependency with Cargo packages in
+order to use the system `pkg-config` tool (if available) to determine where a
+library is located.
+
+You can use this crate directly to probe for specific libraries, or use
+[metadeps](https://github.com/joshtriplett/metadeps) to declare all your
+`pkg-config` dependencies in `Cargo.toml`.
+
+# Example
+
+Find the system library named `foo`, with minimum version 1.2.3:
+
+```rust
+extern crate pkg_config;
+
+fn main() {
+    pkg_config::Config::new().atleast_version("1.2.3").probe("foo").unwrap();
+}
+```
+
+Find the system library named `foo`, with no version requirement (not
+recommended):
+
+```rust
+extern crate pkg_config;
+
+fn main() {
+    pkg_config::probe_library("foo").unwrap();
+}
+```
+
+# License
+
+`pkg-config-rs` is primarily distributed under the terms of both the MIT
+license and the Apache License (Version 2.0), with portions covered by various
+BSD-like licenses.
+
+See LICENSE-APACHE, and LICENSE-MIT for details.