clasp 2.1.1

Closes Homebrew/homebrew#17170.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

Formula/clasp.rb

@@ -0,0 +1,33 @@
+require 'formula'
+
+class Clasp < Formula
+  homepage 'http://potassco.sourceforge.net/'
+  url 'http://downloads.sourceforge.net/project/potassco/clasp/2.1.1/clasp-2.1.1-source.tar.gz'
+  sha1 '4c2bc5fc4b7c9ccfc461dc86a1d449a337602dfe'
+
+  option 'with-mt', 'Enable multi-thread support'
+
+  depends_on 'tbb' if build.include? 'with-mt'
+
+  def install
+    if build.include? 'with-mt'
+      ENV['TBB30_INSTALL_DIR'] = Formula.factory("tbb").opt_prefix
+      build_dir = 'build/release_mt'
+    else
+      build_dir = 'build/release'
+    end
+
+    args = %W[
+      --config=release
+      --prefix=#{prefix}
+    ]
+    args << "--with-mt" if build.include? 'with-mt'
+
+    bin.mkpath
+    system "./configure.sh", *args
+
+    cd build_dir do
+      system "make install"
+    end
+  end
+end