confuse 3.0

Hold back to v3.0 since 3.1 onwards rely on fmemopen(3) and its
implementation for backwards compatibility with systems that lack it
e.g Tiger doesn't work.
libconfuse/libconfuse#147

Library/Formula/confuse.rb

@@ -1,21 +1,45 @@
 class Confuse < Formula
   desc "Configuration file parser library written in C"
-  homepage "http://www.nongnu.org/confuse/"
-  url "http://savannah.nongnu.org/download/confuse/confuse-2.7.tar.gz"
-  sha256 "e32574fd837e950778dac7ade40787dd2259ef8e28acd6ede6847ca895c88778"
+  homepage "https://github.com/libconfuse/libconfuse"
+  url "https://github.com/libconfuse/libconfuse/releases/download/v3.0/confuse-3.0.tar.xz"
+  sha256 "bb75174e02aa8b44fa1a872a47beeea1f5fe715ab669694c97803eb6127cc861"
+  license "ISC"
 
   bottle do
-    cellar :any
-    sha1 "1364f86a7dfa199fee07f273f6e3b4945b9db02a" => :yosemite
-    sha1 "d1edb26d0b30a9d85453cf811a5acf582dba3d56" => :mavericks
-    sha1 "9ede76f809eb464d96a8f703fb74c1678fc0c48d" => :mountain_lion
   end
 
   depends_on "pkg-config" => :build
 
   def install
+    # Need unsetenv(3) to return int, not void
+    ENV.append_to_cflags "-D__DARWIN_UNIX03" if MacOS.version == :tiger
     system "./configure", "--disable-dependency-tracking",
                           "--prefix=#{prefix}"
+    system "make", "check"
     system "make", "install"
   end
+
+  test do
+    (testpath/"test.c").write <<~EOS
+      #include <confuse.h>
+      #include <stdio.h>
+
+      cfg_opt_t opts[] =
+      {
+        CFG_STR("hello", NULL, CFGF_NONE),
+        CFG_END()
+      };
+
+      int main(void)
+      {
+        cfg_t *cfg = cfg_init(opts, CFGF_NONE);
+        if (cfg_parse_buf(cfg, "hello=world") == CFG_SUCCESS)
+          printf("%s\\n", cfg_getstr(cfg, "hello"));
+        cfg_free(cfg);
+        return 0;
+      }
+    EOS
+    system ENV.cc, "test.c", "-L#{lib}", "-lconfuse", "-o", "test"
+    assert_match "world", shell_output("./test")
+  end
 end