libpq 9.6.3 (new formula)

Formula/libpq.rb

@@ -0,0 +1,49 @@
+class Libpq < Formula
+  desc "Postgres C API library"
+  homepage "https://www.postgresql.org/docs/9.6/static/libpq.html"
+  url "https://ftp.postgresql.org/pub/source/v9.6.3/postgresql-9.6.3.tar.bz2"
+  sha256 "1645b3736901f6d854e695a937389e68ff2066ce0cde9d73919d6ab7c995b9c6"
+
+  keg_only "conflicts with postgres formula"
+
+  depends_on "openssl"
+
+  def install
+    system "./configure", "--disable-debug",
+                          "--prefix=#{prefix}",
+                          "--with-openssl"
+    system "make"
+    system "make", "-C", "src/bin", "install"
+    system "make", "-C", "src/include", "install"
+    system "make", "-C", "src/interfaces", "install"
+    system "make", "-C", "doc", "install"
+  end
+
+  test do
+    (testpath/"libpq.c").write <<-EOS
+      #include <stdio.h>
+      #include <libpq-fe.h>
+
+      int main()
+      {
+          const char *conninfo;
+          PGconn     *conn;
+
+          conninfo = "dbname = postgres";
+
+          conn = PQconnectdb(conninfo);
+
+          if (PQstatus(conn) != CONNECTION_OK) // This should always fail
+          {
+              printf("Connection to database attempted and failed");
+              PQfinish(conn);
+              exit(0);
+          }
+
+          return 0;
+        }
+    EOS
+    system ENV.cc, "libpq.c", "-L#{lib}", "-I#{include}", "-lpq", "-o", "libpqtest"
+    assert_equal "Connection to database attempted and failed", shell_output("./libpqtest")
+  end
+end