From 01e46671756d4e729adb0bfd88f3c98638712b5d Mon Sep 17 00:00:00 2001
From: Steven Fackler <sfackler@palantir.com>
Date: Tue, 24 Jan 2017 21:31:41 +0100
Subject: [PATCH] Make sure to not add system dirs to linkage

cc #447
---
 openssl-sys/Cargo.toml |  5 +++--
 openssl-sys/build.rs   | 21 +++++++++++++++++----
 2 files changed, 20 insertions(+), 6 deletions(-)

diff --git a/openssl-sys/Cargo.toml b/openssl-sys/Cargo.toml
index fe484a79..1f1750dc 100644
--- a/openssl-sys/Cargo.toml
+++ b/openssl-sys/Cargo.toml
@@ -15,11 +15,12 @@ build = "build.rs"
 libc = "0.2"
 
 [build-dependencies]
-metadeps = "1"
+pkg-config = "0.3.9"
 
 [target.'cfg(windows)'.dependencies]
 user32-sys = "0.2"
 gdi32-sys = "0.2"
 
+# We don't actually use metadeps for annoying reasons but this is still hear for tooling
 [package.metadata.pkg-config]
-openssl = "1.0.0" # We actually need 1.0.1, but OpenBSD reports as 1.0.0
+openssl = "1.0.1"
diff --git a/openssl-sys/build.rs b/openssl-sys/build.rs
index c59a76d4..0e1cdc46 100644
--- a/openssl-sys/build.rs
+++ b/openssl-sys/build.rs
@@ -1,4 +1,4 @@
-extern crate metadeps;
+extern crate pkg_config;
 
 use std::collections::HashSet;
 use std::env;
@@ -172,8 +172,16 @@ fn try_pkg_config() {
     // cflags dirs for showing us lots of `-I`.
     env::set_var("PKG_CONFIG_ALLOW_SYSTEM_CFLAGS", "1");
 
-    let lib = match metadeps::probe() {
-        Ok(mut libs) => libs.remove("openssl").unwrap(),
+    // This is more complex than normal because we need to track down opensslconf.h.
+    // To do that, we need the inlude paths even if they're on the default search path, but the
+    // linkage directories emitted from that cause all kinds of issues if other libraries happen to
+    // live in them. So, we run pkg-config twice, once asking for system dirs but not emitting
+    // metadata, and a second time emitting metadata but not asking for system dirs. Yay.
+    let lib = match pkg_config::Config::new()
+        .cargo_metadata(false)
+        .print_system_libs(true)
+        .find("openssl") {
+        Ok(lib) => lib,
         Err(_) => return,
     };
 
@@ -196,7 +204,7 @@ specific to your distribution:
     sudo dnf install openssl-devel
 
 See rust-openssl README for more information:
-    
+
     https://github.com/sfackler/rust-openssl#linux
 ");
     }
@@ -207,6 +215,11 @@ See rust-openssl README for more information:
         println!("cargo:include={}", include.display());
     }
 
+    pkg_config::Config::new()
+        .print_system_libs(false)
+        .find("openssl")
+        .unwrap();
+
     std::process::exit(0);
 }