diff --git a/ghc-data-default-class.spec b/ghc-data-default-class.spec
index fcffa7b..e44cb1c 100644
--- a/ghc-data-default-class.spec
+++ b/ghc-data-default-class.spec
@@ -1,58 +1,80 @@
 %define ghc_ver %(ghc --version | sed "s|.*version ||")
-%define pkgname %(echo %name | sed "s|^ghc-||")
+%define pkg_name %(echo %name | sed "s|^ghc-||")
 Name:          ghc-data-default-class
 Version:       0.1.2.0
-Release:       1mamba
+Release:       2mamba
 Summary:       A class for types with a default value
 Group:         System/Libraries
 Vendor:        openmamba
 Distribution:  openmamba
 Packager:      Silvan Calarco <silvan.calarco@mambasoft.it>
-URL:           https://hackage.haskell.org/package/%{pkgname}
+URL:           https://hackage.haskell.org/package/%{pkg_name}
 Source:        http://hackage.haskell.org/packages/archive/data-default-class/%{version}/data-default-class-%{version}.tar.gz
 License:       BSD
 ## AUTOBUILDREQ-BEGIN
+BuildRequires: ghc-libs
+BuildRequires: glibc-devel
+BuildRequires: libgmp-devel
 ## AUTOBUILDREQ-END
-BuildRequires: ghc
+BuildRequires: ghc >= 9.4.8
 Requires:      ghc = %{ghc_ver}
-BuildRoot:     %{_tmppath}/%{name}-%{version}-root
 
 %description
 A class for types with a default value.
 
+%package devel
+Summary:        Haskell %{pkg_name} library development files
+Provides:       %{name}-static = %{version}-%{release}
+Provides:       %{name}-static%{?_isa} = %{version}-%{release}
+%if %{defined ghc_version}
+Requires:       ghc = %{ghc_version}
+%endif
+Requires:       %{name}%{?_isa} = %{version}-%{release}
+
+%description devel
+This package provides the Haskell %{pkg_name} library development files.
+
+%if %{with haddock}
+%package doc
+Summary:        Haskell %{pkg_name} library documentation
+Requires:       ghc-filesystem
+
+%description doc
+This package provides the Haskell %{pkg_name} library documentation.
+%endif
+
 %prep
 %setup -q -n data-default-class-%{version}
 
 %build
-runghc Setup.lhs configure \
---prefix=%{_prefix} --libdir=%{_libdir}
-
-runghc Setup.lhs build
+%ghc_lib_build
 
 %install
-[ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
-runghc Setup.lhs copy --destdir=%{buildroot}
-runghc Setup.lhs register \
---gen-pkg-config="%{buildroot}%{_libdir}/ghc-%{ghc_ver}/%{pkgname}-%{version}/%{pkgname}-%{version}.conf"
+%ghc_lib_install
+
+rm -f %{buildroot}%{_ghclicensedir}/%{name}/LICENSE
 
 %clean
 [ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
 
-%post
-ghc-pkg register %{_libdir}/ghc-%{ghc_ver}/%{pkgname}-%{version}/%{pkgname}-%{version}.conf &>/dev/null || true
-:
-
-%preun
-ghc-pkg unregister %{_libdir}/ghc-%{ghc_ver}/%{pkgname}-%{version}/%{pkgname}-%{version}.conf &>/dev/null || true
-:
-
-%files
+%files -f %{name}.files
 %defattr(-,root,root)
-%dir %{_libdir}/ghc-%{ghc_ver}/%{pkgname}-%{version}
-%{_libdir}/ghc-%{ghc_ver}/%{pkgname}-%{version}/*
-%{_datadir}/doc/%{pkgname}-%{version}/LICENSE
+%license LICENSE
+
+%files devel -f %{name}-devel.files
+%defattr(-,root,root)
+#%doc CHANGELOG.markdown README.markdown
+
+%if %{with haddock}
+%files doc -f %{name}-doc.files
+%defattr(-,root,root)
+%license LICENSE
+%endif
 
 %changelog
+* Sat Dec 02 2023 Silvan Calarco <silvan.calarco@mambasoft.it> 0.1.2.0-2mamba
+- rebuilt with ghc 9.4.8
+
 * Thu Feb 04 2021 Automatic Build System <autodist@mambasoft.it> 0.1.2.0-1mamba
 - automatic version update by autodist