diff --git a/ghc-base64-bytestring.spec b/ghc-base64-bytestring.spec
index ca1b32b..c65056a 100644
--- a/ghc-base64-bytestring.spec
+++ b/ghc-base64-bytestring.spec
@@ -1,61 +1,79 @@
 %define ghc_ver %(ghc --version | sed "s|.*version ||")
+%define pkg_name base64-bytestring
+
 Name:          ghc-base64-bytestring
-Version:       1.2.0.1
+Version:       1.2.1.0
 Release:       1mamba
 Summary:       A Haskell library for working with base64-encoded data quickly and efficiently
 Group:         System/Libraries
 Vendor:        openmamba
 Distribution:  openmamba
 Packager:      Silvan Calarco <silvan.calarco@mambasoft.it>
-URL:           https://github.com/bos/base64-bytestring
-## GITSOURCE https://github.com/bos/base64-bytestring.git 1.0.0.1
-Source:        https://github.com/bos/base64-bytestring.git/%{version}/base64-bytestring-%{version}.tar.bz2
+URL:           https://github.com/haskell/base64-bytestring
+Source:        https://hackage.haskell.org/package/base64-bytestring-%{version}/base64-bytestring-%{version}.tar.gz
 License:       BSD
 ## AUTOBUILDREQ-BEGIN
+BuildRequires: ghc
+BuildRequires: glibc-devel
+BuildRequires: libgmp-devel
 ## AUTOBUILDREQ-END
 BuildRequires: ghc
 Requires:      ghc = %{ghc_ver}
-BuildRoot:     %{_tmppath}/%{name}-%{version}-root
 
 %description
 This package provides a Haskell library for working with base64-encoded data quickly and efficiently, using the ByteString type.
 
+%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 base64-bytestring-%{version}
 
 %build
-runghc Setup.hs configure \
-   --prefix=%{_prefix} \
-   --bindir=%{_bindir} \
-   --libdir=%{_libdir} \
-   --datadir=%{_datadir}
-
-runghc Setup.hs build
+%ghc_lib_build
 
 %install
-[ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
-runghc Setup.hs copy --destdir=%{buildroot}
-runghc Setup.hs register \
-   --gen-pkg-config="%{buildroot}%{_libdir}/ghc-%{ghc_ver}/base64-bytestring-%{version}/base64-bytestring-%{version}.conf"
+%ghc_lib_install
+
+rm -f %{buildroot}%{_ghclicensedir}/%{name}/LICENSE
 
 %clean
 [ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
 
-%post
-ghc-pkg register %{_libdir}/ghc-%{ghc_ver}/base64-bytestring-%{version}/base64-bytestring-%{version}.conf &>/dev/null || true
-:
-
-%postun
-ghc-pkg unregister %{_libdir}/ghc-%{ghc_ver}/base64-bytestring-%{version}/base64-bytestring-%{version}.conf &>/dev/null || true
-:
-
-%files
+%files -f %{name}.files
 %defattr(-,root,root)
-%dir %{_libdir}/ghc-%{ghc_ver}/base64-bytestring-%{version}
-%{_libdir}/ghc-%{ghc_ver}/base64-bytestring-%{version}/*
-%{_datadir}/doc/base64-bytestring-%{version}/LICENSE
+%license LICENSE
+
+%files devel -f %{name}-devel.files
+%doc CHANGELOG.md README.md
+
+%if %{with haddock}	
+%files doc -f %{name}-doc.files
+%license LICENSE
+%endif
 
 %changelog
+* Tue Nov 14 2023 Silvan Calarco <silvan.calarco@mambasoft.it> 1.2.1.0-1mamba
+- update to 1.2.1.0
+
 * Thu Feb 04 2021 Automatic Build System <autodist@mambasoft.it> 1.2.0.1-1mamba
 - automatic version update by autodist