diff --git a/README.md b/README.md
index ae91e99..b146729 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,4 @@
 # double-conversion
 
+Efficient binary-decimal and decimal-binary conversion routines for IEEE doubles.
+
diff --git a/double-conversion.spec b/double-conversion.spec
new file mode 100644
index 0000000..ae8afb5
--- /dev/null
+++ b/double-conversion.spec
@@ -0,0 +1,79 @@
+Name:          double-conversion
+Version:       3.1.5
+Release:       1mamba
+Summary:       Efficient binary-decimal and decimal-binary conversion routines for IEEE doubles
+Group:         System/Libraries
+Vendor:        openmamba
+Distribution:  openmamba
+Packager:      Silvan Calarco <silvan.calarco@mambasoft.it>
+URL:           https://github.com/google/double-conversion
+## GITSOURCE https://github.com/google/double-conversion.git v3.1.5
+Source:        https://github.com/google/double-conversion.git/v%{version}/double-conversion-%{version}.tar.bz2
+License:       BSD
+## AUTOBUILDREQ-BEGIN
+BuildRequires: glibc-devel
+BuildRequires: ldconfig
+BuildRequires: libgcc
+BuildRequires: libstdc++6-devel
+## AUTOBUILDREQ-END
+BuildRequires: cmake
+Requires:      lib%{name} = %{?epoch:%epoch:}%{version}-%{release}
+BuildRoot:     %{_tmppath}/%{name}-%{version}-root
+
+%description
+Efficient binary-decimal and decimal-binary conversion routines for IEEE doubles.
+
+%package -n lib%{name}
+Group:         System/Libraries
+Summary:       Efficient binary-decimal and decimal-binary conversion routines for IEEE doubles.
+
+%description -n lib%{name}
+Efficient binary-decimal and decimal-binary conversion routines for IEEE doubles.
+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
+%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}/libdouble-conversion.so.*
+%doc AUTHORS COPYING LICENSE
+
+%files -n lib%{name}-devel
+%defattr(-,root,root)
+%dir %{_includedir}/double-conversion
+%{_includedir}/double-conversion/*.h
+%dir %{_libdir}/cmake/double-conversion
+%{_libdir}/cmake/double-conversion/double-conversion*.cmake
+%{_libdir}/libdouble-conversion.so
+%doc README.md
+
+
+%changelog
+* Tue May 12 2020 Silvan Calarco <silvan.calarco@mambasoft.it> 3.1.5-1mamba
+- package created using the webbuild interface