diff --git a/README.md b/README.md
index e1f773d..7a9c108 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,4 @@
 # ghc-zlib
 
+GHC zlib: Compression and decompression in the gzip and zlib formats.
+
diff --git a/ghc-zlib.spec b/ghc-zlib.spec
new file mode 100644
index 0000000..c7bc89b
--- /dev/null
+++ b/ghc-zlib.spec
@@ -0,0 +1,79 @@
+%define ghc_ver %(ghc --numeric-version)
+%define pkg_name %(echo %name | sed "s|^ghc-||")
+
+Name:          ghc-zlib
+Version:       0.6.3.0
+Release:       1mamba
+Summary:       GHC zlib: Compression and decompression in the gzip and zlib formats
+Group:         Development/Libraries
+Vendor:        openmamba
+Distribution:  openmamba
+Packager:      Silvan Calarco <silvan.calarco@mambasoft.it>
+URL:           https://hackage.haskell.org/package/%{pkg_name}
+Source:        https://hackage.haskell.org/package/zlib-%{version}/zlib-%{version}.tar.gz
+License:       BSD
+## AUTOBUILDREQ-BEGIN
+BuildRequires: ghc-libs
+BuildRequires: glibc-devel
+BuildRequires: libgmp-devel
+BuildRequires: libz-devel
+## AUTOBUILDREQ-END
+BuildRequires: ghc
+BuildRequires: ghc-rpm-macros
+Requires:      ghc = %{ghc_ver}
+
+%description
+%{summary}.
+
+%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 zlib-%{version}
+
+%build
+%ghc_lib_build
+
+%install
+%ghc_lib_install
+
+rm -f %{buildroot}%{_ghclicensedir}/%{name}/LICENSE
+
+%clean
+[ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
+
+%files -f %{name}.files
+%defattr(-,root,root)
+%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> 0.6.3.0-1mamba
+- package created using the webbuild interface