diff --git a/Formula/libical.rb b/Formula/libical.rb
index dee382d0d19..0a60f94e7c0 100644
--- a/Formula/libical.rb
+++ b/Formula/libical.rb
@@ -1,17 +1,17 @@
-require 'formula'
+require "formula"
 
 class Libical < Formula
-  homepage 'http://www.citadel.org/doku.php/documentation:featured_projects:libical'
-  url 'https://downloads.sourceforge.net/project/freeassociation/libical/libical-1.0/libical-1.0.tar.gz'
-  sha1 '25c75f6f947edb6347404a958b1444cceeb9f117'
+  homepage "http://www.citadel.org/doku.php/documentation:featured_projects:libical"
+  url "https://downloads.sourceforge.net/project/freeassociation/libical/libical-1.0/libical-1.0.tar.gz"
+  sha1 "25c75f6f947edb6347404a958b1444cceeb9f117"
 
-  depends_on :autoconf
-  depends_on :automake
-  depends_on :libtool
+  depends_on "autoconf" => :build
+  depends_on "automake" => :build
+  depends_on "libtool" => :build
 
   def install
     system "./bootstrap"
-    system "./configure", "--prefix=#{prefix}", "--disable-debug", "--disable-dependency-tracking"
+    system "./configure", "--disable-dependency-tracking", "--prefix=#{prefix}"
     system "make install"
   end
 end