diff --git a/README.md b/README.md
index 4b605cf..2fd92ec 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,4 @@
 # imath3131
 
+Imath is a C++ and python library of 2D and 3D vector, matrix, and math operations for computer graphics.
+
diff --git a/imath3131.spec b/imath3131.spec
new file mode 100644
index 0000000..a706b3b
--- /dev/null
+++ b/imath3131.spec
@@ -0,0 +1,110 @@
+Name:          imath3131
+Version:       3.1.8
+Release:       2mamba
+Summary:       A C++ and python library of 2D and 3D vector, matrix, and math operations for computer graphics
+Group:         System/Libraries
+Vendor:        openmamba
+Distribution:  openmamba
+Packager:      Silvan Calarco <silvan.calarco@mambasoft.it>
+URL:           https://github.com/AcademySoftwareFoundation/Imath
+Source:        https://github.com/AcademySoftwareFoundation/Imath.git/v%{version}/Imath-%{version}.tar.bz2
+License:       BSD
+## AUTOBUILDREQ-BEGIN
+BuildRequires: glibc-devel
+BuildRequires: libgcc
+BuildRequires: libstdc++6-devel
+## AUTOBUILDREQ-END
+BuildRequires: cmake
+Requires:      lib%{name} = %{?epoch:%epoch:}%{version}-%{release}
+
+%description
+Imath is a C++ and python library of 2D and 3D vector, matrix, and math operations for computer graphics.
+
+%package -n lib%{name}
+Group:         System/Libraries
+Summary:       A C++ and python library of 2D and 3D vector, matrix, and math operations for computer graphics
+
+%description -n lib%{name}
+Imath is a C++ and python library of 2D and 3D vector, matrix, and math operations for computer graphics.
+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}
+Requires:      pkg-config
+
+%description -n lib%{name}-devel
+This package contains libraries and header files for developing applications that use %{name}.
+
+%debug_package
+
+%prep
+%setup -q -n Imath-%{version}
+
+%build
+%cmake -d build
+%make
+
+%install
+[ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
+%makeinstall -C build
+
+%clean
+[ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
+
+%post -n lib%{name} -p /sbin/ldconfig
+%postun -n lib%{name} -p /sbin/ldconfig
+
+%files -n lib%{name}
+%defattr(-,root,root)
+%{_libdir}/libImath-*.so.*
+%doc LICENSE.md
+
+%files -n lib%{name}-devel
+%defattr(-,root,root)
+%dir %{_includedir}/Imath
+%{_includedir}/Imath/*
+%dir %{_libdir}/cmake/Imath
+%{_libdir}/cmake/Imath/Imath*.cmake
+%{_libdir}/libImath-*.so
+%{_libdir}/libImath.so
+%{_libdir}/pkgconfig/Imath.pc
+%doc README.md
+
+%changelog
+* Sat Jun 10 2023 Silvan Calarco <silvan.calarco@mambasoft.it> 3.1.8-2mamba
+- legacy package
+
+* Thu May 25 2023 Automatic Build System <autodist@mambasoft.it> 3.1.8-1mamba
+- automatic version update by autodist
+
+* Fri Mar 03 2023 Automatic Build System <autodist@mambasoft.it> 3.1.7-1mamba
+- automatic version update by autodist
+
+* Wed Nov 09 2022 Automatic Build System <autodist@mambasoft.it> 3.1.6-1mamba
+- automatic version update by autodist
+
+* Wed Mar 30 2022 Automatic Build System <autodist@mambasoft.it> 3.1.5-1mamba
+- automatic version update by autodist
+
+* Sun Jan 23 2022 Automatic Build System <autodist@mambasoft.it> 3.1.4-1mamba
+- automatic version update by autodist
+
+* Fri Sep 03 2021 Automatic Build System <autodist@mambasoft.it> 3.1.3-1mamba
+- automatic version update by autodist
+
+* Sun Aug 01 2021 Automatic Build System <autodist@mambasoft.it> 3.1.2-1mamba
+- automatic version update by autodist
+
+* Wed Jul 21 2021 Automatic Build System <autodist@mambasoft.it> 3.1.1-1mamba
+- automatic version update by autodist
+
+* Thu Jul 15 2021 Automatic Build System <autodist@mambasoft.it> 3.1.0-1mamba
+- automatic version update by autodist
+
+* Wed Jun 30 2021 Automatic Build System <autodist@mambasoft.it> 3.0.5-1mamba
+- automatic version update by autodist
+
+* Sun Jun 20 2021 Silvan Calarco <silvan.calarco@mambasoft.it> 3.0.4-1mamba
+- package created using the webbuild interface