diff --git a/pkgs/development/libraries/libtommath/default.nix b/pkgs/development/libraries/libtommath/default.nix
index 8b7c06b98dc..cd13eef156d 100644
--- a/pkgs/development/libraries/libtommath/default.nix
+++ b/pkgs/development/libraries/libtommath/default.nix
@@ -1,27 +1,35 @@
-{stdenv, fetchurl, libtool}:
+{ stdenv, fetchurl, libtool }:
+
+stdenv.mkDerivation rec {
+  name = "libtommath-${version}";
+  version = "1.0.1";
 
-stdenv.mkDerivation {
-  name = "libtommath-1.0";
-  
   src = fetchurl {
-    url = https://github.com/libtom/libtommath/releases/download/v1.0/ltm-1.0.tar.xz;
-    sha256 = "0v5mpd8zqjfs2hr900w1mxifz23xylyjdqyx1i1wl7q9xvwpsflr";
+    url = "https://github.com/libtom/libtommath/releases/download/v${version}/ltm-${version}.tar.xz";
+    sha256 = "0sbccdwbkfc680id2fi0x067j23biqcjqilwkk7y9339knrjy0s7";
   };
 
-  buildInputs = [libtool];
+  nativeBuildInputs = [ libtool ];
+
+  postPatch = ''
+    substituteInPlace makefile.shared --replace "LT:=glibtool" "LT:=libtool"
+    substituteInPlace makefile_include.mk --replace "shell arch" "shell uname -m"
+  '';
 
   preBuild = ''
-    makeFlagsArray=(LIBPATH=$out/lib INCPATH=$out/include \
-      DATAPATH=$out/share/doc/libtommath/pdf \
+    makeFlagsArray=(PREFIX=$out \
       INSTALL_GROUP=$(id -g) \
       INSTALL_USER=$(id -u))
   '';
 
   makefile = "makefile.shared";
 
-  meta = {
-    homepage = http://math.libtomcrypt.com/;
+  enableParallelBuilding = true;
+
+  meta = with stdenv.lib; {
+    homepage = http://www.libtom.net/LibTomMath/;
     description = "A library for integer-based number-theoretic applications";
-    platforms = stdenv.lib.platforms.unix;
+    license = with licenses; [ publicDomain wtfpl ];
+    platforms = platforms.unix;
   };
 }