luabind: write pkg-config file

Closes Homebrew/homebrew#45721.

Signed-off-by: Dominyk Tiller <dominyktiller@gmail.com>

Formula/luabind.rb

@@ -58,6 +58,22 @@ class Luabind < Formula
     end
     args << "--prefix=#{prefix}"
     system "bjam", *args
+
+    (lib/"pkgconfig/luabind.pc").write pc_file
+  end
+
+  def pc_file; <<-EOS.undent
+    prefix=#{HOMEBREW_PREFIX}
+    exec_prefix=${prefix}
+    libdir=${exec_prefix}/lib
+    includedir=${exec_prefix}/include
+
+    Name: luabind
+    Description: Library for bindings between C++ and Lua
+    Version: 0.9.1
+    Libs: -L${libdir} -lluabind
+    Cflags: -I${includedir}
+    EOS
   end
 
   test do