diff --git a/README.md b/README.md
index 4213d26..5bcd009 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,4 @@
 # ngspice
 
+Mixed-level/Mixed-signal circuit simulator based on Spice3f5, Ciber1b1, and Xspice.
+
diff --git a/ngspice.spec b/ngspice.spec
new file mode 100644
index 0000000..9c41f20
--- /dev/null
+++ b/ngspice.spec
@@ -0,0 +1,111 @@
+Name:          ngspice
+Version:       35
+Release:       1mamba
+Summary:       Mixed-level/Mixed-signal circuit simulator based on Spice3f5, Ciber1b1, and Xspice
+Group:         Applications/Scientific
+Vendor:        openmamba
+Distribution:  openmamba
+Packager:      Silvan Calarco <silvan.calarco@mambasoft.it>
+URL:           http://ngspice.sourceforge.net
+Source:        https://sourceforge.net/projects/ngspice/files/ng-spice-rework/%{version}/ngspice-%{version}.tar.gz
+License:       LGPL, BSD
+## AUTOBUILDREQ-BEGIN
+BuildRequires: glibc-devel
+BuildRequires: libICE-devel
+BuildRequires: libSM-devel
+BuildRequires: libX11-devel
+BuildRequires: libXau-devel
+BuildRequires: libXaw-devel
+BuildRequires: libXdmcp-devel
+BuildRequires: libXext-devel
+BuildRequires: libXft-devel
+BuildRequires: libXmu-devel
+BuildRequires: libXrender-devel
+BuildRequires: libXt-devel
+BuildRequires: libbrotli-devel
+BuildRequires: libbsd-devel
+BuildRequires: libbzip2-devel
+BuildRequires: libexpat-devel
+BuildRequires: libfftw-devel
+BuildRequires: libfontconfig-devel
+BuildRequires: libfreetype-devel
+BuildRequires: libgcc
+BuildRequires: libglib-devel
+BuildRequires: libgraphite2-devel
+BuildRequires: libharfbuzz-devel
+BuildRequires: libpcre-devel
+BuildRequires: libpng-devel
+BuildRequires: libstdc++6-devel
+BuildRequires: libuuid-devel
+BuildRequires: libxcb-devel
+BuildRequires: libz-devel
+## AUTOBUILDREQ-END
+Requires:      lib%{name} = %{?epoch:%epoch:}%{version}-%{release}
+
+%description
+Mixed-level/Mixed-signal circuit simulator based on Spice3f5, Ciber1b1, and Xspice.
+
+%package -n lib%{name}
+Group:         System/Libraries
+Summary:       Shared libraries for %{name}
+Requires:      %{name} = %{?epoch:%epoch:}%{version}-%{release}
+
+%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}
+
+%description -n lib%{name}-devel
+This package contains libraries and header files for developing applications that use %{name}.
+
+%debug_package
+
+%prep
+%setup -q
+
+%build
+%configure \
+   --enable-xspice \
+   --enable-cider \
+   --enable-openmp \
+   --enable-oldapps \
+   --with-ngshared
+
+%make
+
+%install
+[ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
+%makeinstall
+
+%clean
+[ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
+
+%files
+%defattr(-,root,root)
+#%{_bindir}/ngspice
+%dir %{_datadir}/ngspice
+%dir %{_datadir}/ngspice/scripts
+%{_datadir}/ngspice/scripts/*
+#%{_mandir}/man1/ngspice.1*
+
+%files -n lib%{name}
+%defattr(-,root,root)
+%{_libdir}/libngspice.so.*
+%dir %{_libdir}/ngspice
+%{_libdir}/ngspice/*.cm
+%doc AUTHORS COPYING
+
+%files -n lib%{name}-devel
+%defattr(-,root,root)
+%dir %{_includedir}/ngspice
+%{_includedir}/ngspice/sharedspice.h
+%{_libdir}/libngspice.la
+%{_libdir}/libngspice.so
+%{_libdir}/pkgconfig/ngspice.pc
+
+%changelog
+* Thu Oct 14 2021 Silvan Calarco <silvan.calarco@mambasoft.it> 35-1mamba
+- package created using the webbuild interface