diff --git a/README.md b/README.md
index 273bd02..bea95d3 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,4 @@
 # openpmix427
 
+Reference Implementation of the Process Management Interface Exascale (PMIx) standard.
+
diff --git a/openpmix427.spec b/openpmix427.spec
new file mode 100644
index 0000000..a23b569
--- /dev/null
+++ b/openpmix427.spec
@@ -0,0 +1,114 @@
+Name:          openpmix427
+Version:       4.2.7
+Release:       2mamba
+Summary:       Reference Implementation of the Process Management Interface Exascale (PMIx) standard
+Group:         System/Tools
+Vendor:        openmamba
+Distribution:  openmamba
+Packager:      Silvan Calarco <silvan.calarco@mambasoft.it>
+URL:           https://openpmix.github.io/
+Source:        https://github.com/openpmix/openpmix.git/v%{version}/openpmix-%{version}.tar.bz2
+License:       BSD
+## AUTOBUILDREQ-BEGIN
+BuildRequires: glibc-devel
+BuildRequires: libevent-devel
+BuildRequires: libhwloc-devel
+BuildRequires: libz-devel
+## AUTOBUILDREQ-END
+Requires:      lib%{name} = %{?epoch:%epoch:}%{version}-%{release}
+ExclusiveArch: %{ix86}
+Provides:      openpmix
+Obsoletes:     openpmix < 4.2.7-2mamba
+
+%description
+Reference Implementation of the Process Management Interface Exascale (PMIx) standard.
+
+%package -n lib%{name}
+Group:         System/Libraries
+Summary:       Shared libraries for %{name}
+Requires:      %{name} = %{?epoch:%epoch:}%{version}-%{release}
+Provides:      libopenpmix
+Obsoletes:     libopenpmix < 4.2.7-2mamba
+
+%description -n lib%{name}
+This package contains shared libraries for %{name}.
+
+%package -n lib%{name}-devel
+Group:         Development/Libraries
+Summary:       Development files for %{name}
+Requires:      lib%{name} = %{?epoch:%epoch:}%{version}-%{release}
+Provides:      libopenpmix-devel
+Obsoletes:     libopenpmix-devel < 4.2.7-2mamba
+
+%description -n lib%{name}-devel
+This package contains libraries and header files for developing applications that use %{name}.
+
+%debug_package
+
+%prep
+%setup -q -n openpmix-%{version}
+./autogen.pl
+
+%build
+%configure \
+   --sysconfdir=%{_sysconfdir}/openpmix
+
+%make
+
+%install
+[ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
+%makeinstall
+
+%clean
+[ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
+
+%post -n lib%{name} -p /sbin/ldconfig
+%postun -n lib%{name} -p /sbin/ldconfig
+
+%files
+%defattr(-,root,root)
+%dir %{_sysconfdir}/openpmix
+%config(noreplace) %{_sysconfdir}/openpmix/pmix-mca-params.conf
+%{_bindir}/pattrs
+%{_bindir}/pctrl
+%{_bindir}/pevent
+%{_bindir}/plookup
+%{_bindir}/pmix_info
+%{_bindir}/pmixcc
+%{_bindir}/pps
+%{_bindir}/pquery
+%dir %{_datadir}/pmix
+%{_datadir}/pmix/*
+%{_mandir}/man1/pmix_info.1*
+%{_mandir}/man5/openpmix.5*
+
+%files -n lib%{name}
+%defattr(-,root,root)
+%{_libdir}/libpmix.so.*
+%dir %{_libdir}/pmix
+%{_libdir}/pmix/pmix_mca_*.so
+%doc AUTHORS LICENSE
+
+%files -n lib%{name}-devel
+%defattr(-,root,root)
+%dir %{_includedir}/pmix
+%dir %{_includedir}/pmix/src
+%{_includedir}/pmix/src/*
+%{_includedir}/pmix*.h
+%{_libdir}/libpmix.so
+%{_docdir}/pmix/html/.buildinfo
+%dir %{_docdir}/pmix
+%dir %{_docdir}/pmix/html
+%{_docdir}/pmix/html/*
+%{_mandir}/man3/PMIx_Abort.3*
+%{_mandir}/man3/PMIx_Finalize.3*
+%{_mandir}/man3/PMIx_Init.3*
+%{_libdir}/pkgconfig/pmix.pc
+%doc README.md
+
+%changelog
+* Mon Jan 08 2024 Silvan Calarco <silvan.calarco@mambasoft.it> 4.2.7-2mamba
+- i586 legacy package
+
+* Thu Nov 02 2023 Silvan Calarco <silvan.calarco@mambasoft.it> 4.2.7-1mamba
+- package created using the webbuild interface