diff --git a/README.md b/README.md
index cc86086..48e502e 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,4 @@
 # ghc-crypton-x509-validation
 
+GHC crypton-x509-validation: X.509 Certificate and CRL validation.
+
diff --git a/ghc-crypton-x509-validation.spec b/ghc-crypton-x509-validation.spec
new file mode 100644
index 0000000..8a3f8fe
--- /dev/null
+++ b/ghc-crypton-x509-validation.spec
@@ -0,0 +1,89 @@
+%define ghc_ver %(ghc --numeric-version)
+%define pkg_name %(echo %name | sed "s|^ghc-||")
+
+Name:          ghc-crypton-x509-validation
+Version:       1.6.12
+Release:       1mamba
+Summary:       GHC crypton-x509-validation: X.509 Certificate and CRL validation
+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/crypton-x509-validation-%{version}/crypton-x509-validation-%{version}.tar.gz
+License:       BSD
+## AUTOBUILDREQ-BEGIN
+BuildRequires: ghc-asn1-encoding-devel
+BuildRequires: ghc-asn1-parse-devel
+BuildRequires: ghc-asn1-types-devel
+BuildRequires: ghc-basement-devel
+BuildRequires: ghc-crypton-devel
+BuildRequires: ghc-crypton-x509-devel
+BuildRequires: ghc-crypton-x509-store-devel
+BuildRequires: ghc-data-default-class-devel
+BuildRequires: ghc-hourglass-devel
+BuildRequires: ghc-libs
+BuildRequires: ghc-memory-devel
+BuildRequires: ghc-pem-devel
+BuildRequires: glibc-devel
+BuildRequires: libgmp-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 = %{?epoch:%epoch:}%{version}-%{release}
+Provides:       %{name}-static%{?_isa} = %{?epoch:%epoch:}%{version}-%{release}
+%if %{defined ghc_version}
+Requires:       ghc = %{ghc_version}
+%endif
+Requires:       %{name}%{?_isa} = %{?epoch:%epoch:}%{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 crypton-x509-validation-%{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
+* Sun Dec 03 2023 Silvan Calarco <silvan.calarco@mambasoft.it> 1.6.12-1mamba
+- package created using the webbuild interface