diff --git a/Formula/st.rb b/Formula/st.rb
index 8cfccf2cca..a6856b74cf 100644
--- a/Formula/st.rb
+++ b/Formula/st.rb
@@ -1,12 +1,21 @@
-require 'formula'
-
 class St < Formula
-  homepage 'https://github.com/nferraz/st'
-  url 'https://github.com/nferraz/st/archive/v1.1.1.tar.gz'
-  sha1 'ad7fd987b8c986a9ff80a1f65faad7ce6fbb56fa'
+  homepage "https://github.com/nferraz/st"
+  url "https://github.com/nferraz/st/archive/v1.1.1.tar.gz"
+  sha256 "fbfb0680e15448efccc6c6c83e4ae2f4c6a24d12c753444bffbd099632fa70c6"
 
   def install
-    system "perl", "Makefile.PL", "PREFIX=#{prefix}"
+    ENV.prepend_create_path "PERL5LIB", libexec/"lib/perl5/site_perl/"
+
+    system "perl", "Makefile.PL", "PREFIX=#{libexec}"
     system "make", "install"
+    inreplace libexec/"bin/st", "perl -T", "perl"
+
+    bin.install Dir[libexec/"bin/*"]
+    bin.env_script_all_files libexec/"bin", :PERL5LIB => ENV["PERL5LIB"]
+  end
+
+  test do
+    (testpath/"test.txt").write((1..100).map(&:to_s).join("\n"))
+    assert_equal "5050", pipe_output("#{bin}/st --sum test.txt").chomp
   end
 end