Include path to MagickWand for easier building

build.rs

@@ -0,0 +1,8 @@
+// build.rs
+
+fn main() {
+    // For the sake of easily building and testing on Mac, include the path
+    // to MagickWand. Chances are MagickWand is in /usr/local/lib, or
+    // somewhere else that rustc can find it.
+    println!("cargo:rustc-link-search=native=/usr/local/lib");
+}