boolector: add version 1.5 and 1.6

There are two versions here because beginning with 1.6.0, Boolector has
a more restrictive, unfree license which disallows commercial use.

As a result, Boolector 1.5 is the default 'boolector' expression.

Signed-off-by: Austin Seipp <[e-mail]>

pkgs/applications/science/logic/boolector/default.nix

···
+{ stdenv, fetchurl, zlib, useV16 ? false }:
+
+let
+  v15 = rec {
+    name    = "boolector-${version}";
+    version = "1.5.118";
+    src = fetchurl {
+      url    = "http://fmv.jku.at/boolector/${name}-with-sat-solvers.tar.gz";
+      sha256 = "17j7q02rryvfwgvglxnhx0kv8hxwy8wbhzawn48lw05i98vxlmk9";
+    };
+  };
+
+  v16 = rec {
+    name    = "boolector-${version}";
+    version = "1.6.0";
+    src = fetchurl {
+      url    = "http://fmv.jku.at/boolector/${name}-with-sat-solvers.tar.gz";
+      sha256 = "0jka4r6bc3i24axgdp6qbq6gjadwz9kvi11s2c5sbwmdnjd7cp85";
+    };
+  };
+
+  boolectorPkg = if useV16 then v16 else v15;
+  license = with stdenv.lib.licenses; if useV16 then unfreeRedistributable else gpl3;
+in
+stdenv.mkDerivation (boolectorPkg // {
+  buildInputs = [ zlib ];
+  enableParallelBuilding = false;
+
+  buildPhase = "./build.sh";
+
+  installPhase = ''
+    mkdir -p $out/bin $out/lib $out/include
+    cp boolector/boolector      $out/bin
+    cp boolector/deltabtor      $out/bin
+    cp boolector/synthebtor     $out/bin
+    cp boolector/libboolector.a $out/lib
+    cp boolector/boolector.h    $out/include
+  '';
+
+  meta = {
+    inherit license;
+    description = "An extremely fast SMT solver for bit-vectors and arrays";
+    homepage    = "http://fmv.jku.at/boolector";
+    platforms   = stdenv.lib.platforms.linux;
+    maintainers = [ stdenv.lib.maintainers.thoughtpolice ];
+  };
+})

pkgs/top-level/all-packages.nix

···
 
   z3 = callPackage ../applications/science/logic/z3 {};
 
+  boolector   = boolector15;
+  boolector15 = callPackage ../applications/science/logic/boolector {};
+  boolector16 = lowPrio (callPackage ../applications/science/logic/boolector {
+    useV16 = true;
+  });
+
   ### SCIENCE / ELECTRONICS
 
   eagle = callPackage_i686 ../applications/science/electronics/eagle { };