diff --git a/Formula/mpfr@2.rb b/Formula/mpfr@2.rb
new file mode 100644
index 0000000000..a5354874b9
--- /dev/null
+++ b/Formula/mpfr@2.rb
@@ -0,0 +1,63 @@
+class MpfrAT2 < Formula
+  desc "Multiple-precision floating-point computations C lib"
+  homepage "http://www.mpfr.org/"
+  # Track gcc infrastructure releases.
+  url "http://www.mpfr.org/mpfr-2.4.2/mpfr-2.4.2.tar.bz2"
+  mirror "ftp://gcc.gnu.org/pub/gcc/infrastructure/mpfr-2.4.2.tar.bz2"
+  sha256 "c7e75a08a8d49d2082e4caee1591a05d11b9d5627514e678f02d66a124bcf2ba"
+
+  keg_only "Older version of mpfr"
+
+  depends_on "gmp@4"
+
+  fails_with :clang do
+    build 421
+    cause <<-EOS.undent
+      clang build 421 segfaults while building in superenv;
+      see https://github.com/mxcl/homebrew/issues/15061
+      EOS
+  end
+
+  def install
+    args = %W[
+      --disable-dependency-tracking
+      --prefix=#{prefix}
+      --with-gmp=#{Formula["gmp@4"].opt_prefix}
+    ]
+
+    # Build 32-bit where appropriate, and help configure find 64-bit CPUs
+    # Note: This logic should match what the GMP formula does.
+    if MacOS.prefer_64_bit? && !build.build_32_bit?
+      ENV.m64
+      args << "--build=x86_64-apple-darwin"
+    else
+      ENV.m32
+      args << "--build=none-apple-darwin"
+    end
+
+    system "./configure", *args
+    system "make"
+    system "make", "check"
+    system "make", "install"
+  end
+
+  test do
+    (testpath/"test.c").write <<-EOS.undent
+      #include <gmp.h>
+      #include <mpfr.h>
+
+      int main()
+      {
+        mpfr_t x;
+        mpfr_init(x);
+        mpfr_clear(x);
+        return 0;
+      }
+    EOS
+    gmp = Formula["gmp@4"]
+    system ENV.cc, "test.c", "-o", "test",
+                   "-lgmp", "-I#{gmp.include}", "-L#{gmp.lib}",
+                   "-lmpfr", "-I#{include}", "-L#{lib}"
+    system "./test"
+  end
+end
diff --git a/formula_renames.json b/formula_renames.json
index 4dc216793b..d1eaf21a64 100644
--- a/formula_renames.json
+++ b/formula_renames.json
@@ -30,6 +30,7 @@
   "libmongoclient": "mongo-cxx-driver",
   "libmpc08": "libmpc@0.8",
   "mongo-c": "mongo-c-driver",
+  "mpfr2": "mpfr@2",
   "mpich2": "mpich",
   "mysql55": "mysql@5.5",
   "mysql56": "mysql@5.6",