From 7c58e789dd752161ec5d2e103c3ab67ea3456ed4 Mon Sep 17 00:00:00 2001
From: Manish Goregaokar <manishsmail@gmail.com>
Date: Fri, 12 Jun 2015 15:11:21 +0530
Subject: [PATCH] Make this compile on windows

---
 png-sys/build.rs | 29 +++++++++++++++++++++--------
 1 file changed, 21 insertions(+), 8 deletions(-)

diff --git a/png-sys/build.rs b/png-sys/build.rs
index 5c0afef..6a431ba 100644
--- a/png-sys/build.rs
+++ b/png-sys/build.rs
@@ -6,6 +6,7 @@ use std::process::Stdio;
 
 fn main() {
     let target = env::var("TARGET").unwrap();
+    let host = env::var("HOST").unwrap();
     let is_target_embedded = target.find("eabi").is_some();
 
     if is_target_embedded {
@@ -17,19 +18,31 @@ fn main() {
         env::set_var("RANLIB", &ranlib);
     }
 
-    let cfg = PathBuf::from(&env::var("CARGO_MANIFEST_DIR").unwrap()).join("libpng-1.6.16/configure");
+    let cfg = PathBuf::from(&env::var("CARGO_MANIFEST_DIR")
+                            .unwrap()).join("libpng-1.6.16/configure");
     let dst = PathBuf::from(&env::var("OUT_DIR").unwrap());
-
     env::set_var("CFLAGS", "-fPIC -O3");
-
-    let mut cmd = Command::new(cfg);
-    cmd.arg("--with-libpng-prefix=RUST_");
-    if is_target_embedded {
-        cmd.arg(format!("--host={}", target));
+    let mut cmd;
+    if host.find("windows").is_some() {
+        // Here be windows hacks
+
+        // Windows doesn't know how to handle executables
+        // with shebangs, so we pass it through `sh`
+        cmd = Command::new(PathBuf::from("sh"));
+
+        // Windows under mingw also doesn't understand its
+        // own paths, so we pass the path through cygpath
+        cmd.arg("-c").arg(&format!("$(cygpath \"{}\") --with-libpng-prefix=RUST_",
+                                   cfg.to_str().unwrap()));
+    } else {
+        cmd = Command::new(cfg);
+        cmd.arg("--with-libpng-prefix=RUST_");
+        if is_target_embedded {
+            cmd.arg(format!("--host={}", target));
+        }
     }
     cmd.current_dir(&dst);
     run(&mut cmd);
-
     let mut cmd = Command::new("make");
     cmd.arg("-j4");
     cmd.current_dir(&dst);