diff --git a/README.md b/README.md
index 257947b..cdfcb9b 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,4 @@
 # ghc-integer-logarithms
 
+GHC integer-logarithms: Integer logarithms.
+
diff --git a/ghc-integer-logarithms.spec b/ghc-integer-logarithms.spec
new file mode 100644
index 0000000..fb16fea
--- /dev/null
+++ b/ghc-integer-logarithms.spec
@@ -0,0 +1,80 @@
+%define ghc_ver %(ghc --numeric-version)
+%define pkg_name %(echo %name | sed "s|^ghc-||")
+
+Name:          ghc-integer-logarithms
+Version:       1.0.3.1
+Release:       1mamba
+Summary:       GHC integer-logarithms: Integer logarithms
+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/integer-logarithms-%{version}/integer-logarithms-%{version}.tar.gz
+Patch0:        integer-logarithms-1.0.3.1-ghc-9.patch
+License:       BSD
+## AUTOBUILDREQ-BEGIN
+BuildRequires: ghc-libs
+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 = %{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 integer-logarithms-%{version}
+%patch 0 -p1
+
+%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> 1.0.3.1-1mamba
+- package created using the webbuild interface
diff --git a/integer-logarithms-1.0.3.1-ghc-9.patch b/integer-logarithms-1.0.3.1-ghc-9.patch
new file mode 100644
index 0000000..b3d6e45
--- /dev/null
+++ b/integer-logarithms-1.0.3.1-ghc-9.patch
@@ -0,0 +1,22 @@
+--- integer-logarithms-1.0.3.1/integer-logarithms.cabal.orig	2023-12-02 16:13:00.230724310 +0100
++++ integer-logarithms-1.0.3.1/integer-logarithms.cabal	2023-12-02 16:14:06.329272167 +0100
+@@ -56,8 +56,8 @@
+   hs-source-dirs:   src
+   build-depends:
+       array     >=0.3 && <0.6
+-    , base      >=4.3 && <4.16
+-    , ghc-prim  >=0   && <0.8
++    , base      >=4.3 && <4.19
++    , ghc-prim  >=0   && <0.10
+ 
+   if !impl(ghc >=7.10)
+     build-depends: nats >=1.1.2 && <1.2
+@@ -65,7 +65,7 @@
+   if impl(ghc >=9.0)
+     build-depends:
+         base        >=4.15
+-      , ghc-bignum  >=1.0  && <1.1
++      , ghc-bignum  >=1.0  && <1.4
+ 
+     if !flag(integer-gmp)
+       build-depends: invalid-cabal-flag-settings <0