diff --git a/README.md b/README.md
index 51848ce..7567fd3 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,4 @@
 # alex
 
+Lexical analyser generator for Haskell.
+
diff --git a/alex.spec b/alex.spec
new file mode 100644
index 0000000..66e8ae2
--- /dev/null
+++ b/alex.spec
@@ -0,0 +1,76 @@
+%define ghc_ver %(ghc --numeric-version)
+%define pkgname %(echo %name | sed "s|^ghc-||")
+%define bootstrap 1
+
+Name:          alex
+Version:       3.4.0.1
+Release:       1mamba
+Summary:       Lexical analyser generator for Haskell
+Group:         Development/Libraries
+Vendor:        openmamba
+Distribution:  openmamba
+Packager:      Silvan Calarco <silvan.calarco@mambasoft.it>
+URL:           http://hackage.haskell.org/package/%{pkgname}
+Source:        https://hackage.haskell.org/package/alex-%{version}/alex-%{version}.tar.gz
+License:       BSD
+## AUTOBUILDREQ-BEGIN
+BuildRequires: glibc-devel
+BuildRequires: libgmp-devel
+BuildRequires: libnuma-devel
+## AUTOBUILDREQ-END
+%if "%{bootstrap}" == "1"
+BuildRequires: ghc-bin
+%else
+BuildRequires: ghc
+%endif
+Obsoletes:     haskell-platform <= 2013.2.0.0
+#Requires:      ghc = %{ghc_ver}
+
+%description
+Lexical analyser generator for Haskell.
+
+%prep
+%setup -q
+
+%build
+%if "%{bootstrap}" == "1"
+export PATH="/opt/ghc/bin:$PATH"
+%ifarch aarch64
+# ghc-bin 9.0.2 for aarch64 requires llvm 13
+export PATH="/var/autodist/clang+llvm-13.0.1-aarch64-linux-gnu/bin:$PATH"
+%endif
+%endif
+
+runghc Setup.hs configure -v2 \
+   --prefix=%{_prefix} \
+   --libdir=%{_libdir} \
+   --libexecdir=%{_libexecdir} \
+   --docdir=%{_docdir}/%{name}-%{version}
+
+runghc Setup.hs build
+runghc Setup.hs haddock --executable --html-location=URL --hyperlink-source
+
+%install
+[ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
+%if "%{bootstrap}" == "1"
+export PATH="/opt/ghc/bin:$PATH"
+%endif
+
+runghc Setup.hs copy --destdir=%{buildroot}
+runghc Setup.hs register \
+   --gen-pkg-config="%{buildroot}%{_libdir}/ghc-%{ghc_ver}/%{pkgname}-%{version}/%{pkgname}-%{version}.conf"
+
+%clean
+[ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
+
+%files
+%defattr(-,root,root)
+%{_bindir}/alex
+%dir %{_datadir}/*-linux-ghc-*/alex-%{version}
+%{_datadir}/*-linux-ghc-*/alex-%{version}/*.hs
+%{_docdir}/%{name}-%{version}/LICENSE
+%{_docdir}/%{name}-%{version}/html
+
+%changelog
+* Sat Nov 11 2023 Silvan Calarco <silvan.calarco@mambasoft.it> 3.4.0.1-1mamba
+- package created using the webbuild interface