New formula: libtins

Closes Homebrew/homebrew#31399.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

Formula/libtins.rb

@@ -0,0 +1,31 @@
+require "formula"
+
+class Libtins < Formula
+  homepage "https://libtins.github.io/"
+  url "https://github.com/mfontanini/libtins/archive/v3.0.tar.gz"
+  sha1 "0e8a31dde9ba9ec55cc4c6d3142fe4e3912598e3"
+  head "https://github.com/mfontanini/libtins.git"
+
+  option :cxx11
+
+  def install
+    ENV.cxx11 if build.cxx11?
+    args = ["--prefix=#{prefix}"]
+    args << "--enable-c++11" if build.cxx11?
+
+    system "./configure", *args
+    system "make", "install"
+    doc.install "examples"
+  end
+
+  test do
+    (testpath/"test.cpp").write <<-EOS.undent
+      #include <tins/tins.h>
+      int main() {
+        Tins::Sniffer sniffer("en0");
+      }
+    EOS
+    system ENV.cxx, "test.cpp", "-ltins", "-o", "test"
+  end
+
+end