diff --git a/.gitignore b/.gitignore
index 99af215..0eea4ff 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,3 +5,4 @@
 /MemoTrie-0.6.2.tar.gz
 /MemoTrie-0.6.4.tar.gz
 /MemoTrie-0.6.7.tar.gz
+/newtype-generics-0.5.tar.gz
diff --git a/ghc-MemoTrie.spec b/ghc-MemoTrie.spec
index 49dac35..86d50dd 100644
--- a/ghc-MemoTrie.spec
+++ b/ghc-MemoTrie.spec
@@ -4,19 +4,24 @@
 %global pkg_name MemoTrie
 %global pkgver %{pkg_name}-%{version}
 
+%global newtypegenerics newtype-generics-0.5
+%global subpkgs %{newtypegenerics}
+
 Name:           ghc-%{pkg_name}
 Version:        0.6.7
+# can only be reset when all subpkgs bumped
 Release:        1%{?dist}
 Summary:        Trie-based memo functions
 
 License:        BSD
 Url:            https://hackage.haskell.org/package/%{pkg_name}
 Source0:        https://hackage.haskell.org/package/%{pkgver}/%{pkgver}.tar.gz
+Source1:        https://hackage.haskell.org/package/%{newtypegenerics}/%{newtypegenerics}.tar.gz
 
 BuildRequires:  ghc-Cabal-devel
-BuildRequires:  ghc-rpm-macros
+BuildRequires:  ghc-rpm-macros-extra
 # Begin cabal-rpm deps:
-BuildRequires:  ghc-newtype-generics-devel
+#BuildRequires:  ghc-newtype-generics-devel
 # End cabal-rpm deps
 
 %description
@@ -39,16 +44,28 @@ Requires:       %{name}%{?_isa} = %{version}-%{release}
 This package provides the Haskell %{pkg_name} library development files.
 
 
+%global main_version %{version}
+
+%if %{defined ghclibdir}
+%ghc_lib_subpackage %{newtypegenerics}
+%endif
+
+%global version %{main_version}
+
+
 %prep
-%setup -q -n %{pkgver}
+%setup -q -n %{pkgver} -a1
 
 
 %build
+%ghc_libs_build %{subpkgs}
 %ghc_lib_build
 
 
 %install
+%ghc_libs_install %{subpkgs}
 %ghc_lib_install
+%ghc_fix_rpath %{subpkgs}
 
 
 %post devel
@@ -68,8 +85,9 @@ This package provides the Haskell %{pkg_name} library development files.
 
 
 %changelog
-* Thu Feb 23 2017 Jens Petersen <petersen@redhat.com> - 0.6.7-1
+* Tue Feb 28 2017 Jens Petersen <petersen@redhat.com> - 0.6.7-1
 - update to 0.6.7
+- subpackage newtype-generics
 
 * Fri Feb 10 2017 Fedora Release Engineering <releng@fedoraproject.org> - 0.6.4-3
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_26_Mass_Rebuild