diff --git a/README.md b/README.md
index d825c00..5ee5e65 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,4 @@
 # nunit
 
+Unit test framework for CLI.
+
diff --git a/nunit.pc b/nunit.pc
new file mode 100644
index 0000000..ff1f497
--- /dev/null
+++ b/nunit.pc
@@ -0,0 +1,8 @@
+prefix=/usr
+exec_prefix=${prefix}
+libdir=${exec_prefix}/lib
+
+Name: NUnit
+Description: Testing framework for CLI
+Version: 3.6.0.0
+Libs: -r:${libdir}/mono/nunit/nunit.framework.dll -r:${libdir}/mono/nunit/nunit.framework.tests.dll -r:${libdir}/mono/nunit/nunit.testdata.dll -r:${libdir}/mono/nunit/nunitlite.dll
diff --git a/nunit.spec b/nunit.spec
new file mode 100644
index 0000000..ff70d4c
--- /dev/null
+++ b/nunit.spec
@@ -0,0 +1,87 @@
+Name:          nunit
+Version:       3.7.1
+Release:       1mamba
+Summary:       Unit test framework for CLI
+Group:         Applications/Development
+Vendor:        openmamba
+Distribution:  openmamba
+Packager:      Silvan Calarco <silvan.calarco@mambasoft.it>
+URL:           https://nunit.org/
+Source:        https://github.com/nunit/nunit.git/%{version}/nunit-%{version}.tar.bz2
+Source1:       nunit.pc
+Source2:       nunitlite-runner.sh
+License:       MIT
+## AUTOBUILDREQ-BEGIN
+## AUTOBUILDREQ-END
+BuildRequires: mono-devel
+Provides:      mono-nunit
+Obsoletes:     mono-nunit < 6.12.0.122
+
+%description
+Unit test framework for CLI.
+
+%package devel
+Group:         Development/Libraries
+Summary:       Development files for %{name}
+Requires:      %{name} = %{?epoch:%epoch:}%{version}-%{release}
+Requires:      pkg-config
+
+%description devel
+This package contains libraries and header files for developing applications that use %{name}.
+
+#% debug_package
+
+%prep
+%setup -q
+
+%build
+# Remove prebuilt binaries
+find . -name "*.dll" -print -delete
+
+xbuild /property:Configuration=Release src/NUnitFramework/framework/nunit.framework-4.5.csproj
+xbuild /property:Configuration=Release src/NUnitFramework/nunitlite/nunitlite-4.5.csproj
+xbuild /property:Configuration=Release src/NUnitFramework/nunitlite-runner/nunitlite-runner-4.5.csproj
+xbuild /property:Configuration=Release src/NUnitFramework/mock-assembly/mock-assembly-4.5.csproj
+ 
+xbuild /property:Configuration=Release src/NUnitFramework/slow-tests/slow-nunit-tests-4.5.csproj	
+xbuild /property:Configuration=Release src/NUnitFramework/testdata/nunit.testdata-4.5.csproj
+xbuild /property:Configuration=Release src/NUnitFramework/tests/nunit.framework.tests-4.5.csproj
+xbuild /property:Configuration=Release src/NUnitFramework/nunitlite.tests/nunitlite.tests-4.5.csproj
+ 
+%install
+[ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
+install -d -m0755 %{buildroot}{%{_prefix}/lib/mono/nunit,%{_libdir}/pkgconfig,%{_bindir},%{_datadir}/applications,%{_datadir}/icons/NUnit}
+
+%{__install} -m0644 %{SOURCE1} %{buildroot}%{_libdir}/pkgconfig/
+%{__install} -m0755 %{SOURCE2} %{buildroot}%{_bindir}/nunitlite-runner
+
+%{__install} -m0644 src/NUnitFramework/nunitlite-runner/App.config %{buildroot}%{_prefix}/lib/mono/nunit/nunitlite-runner.exe.config
+find %{_builddir}/%{?buildsubdir}/bin -name \*.dll -exec %{__install} \-m0755 "{}" "%{buildroot}%{_prefix}/lib/mono/nunit/" \;
+find %{_builddir}/%{?buildsubdir}/bin -name \*.exe -exec %{__install} \-m0755 "{}" "%{buildroot}%{_prefix}/lib/mono/nunit/" \;
+
+# FIXME? Failure adding assembly .. to the cache: Strong name cannot be verified for delay-signed assembly
+#for i in nunit.framework.dll nunit.framework.tests.dll nunitlite.dll nunit.testdata.dll; do
+#    gacutil -i %{buildroot}%{_prefix}/lib/mono/nunit/$i -package nunit -root %{buildroot}%{_prefix}/lib/mono/../
+#done
+
+%clean
+[ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
+
+%files
+%defattr(-,root,root)
+%{_bindir}/nunitlite-runner
+%dir %{_prefix}/lib/mono/nunit
+%{_prefix}/lib/mono/nunit/*
+
+%files devel
+%defattr(-,root,root)
+%{_libdir}/pkgconfig/nunit.pc
+%doc README.md
+
+
+%changelog
+* Wed Mar 08 2023 Silvan Calarco <silvan.calarco@mambasoft.it> 3.7.1-1mamba
+- update to 3.7.1
+
+* Wed Mar 08 2023 Silvan Calarco <silvan.calarco@mambasoft.it> 3.13.3-1mamba
+- package created using the webbuild interface
diff --git a/nunitlite-runner.sh b/nunitlite-runner.sh
new file mode 100644
index 0000000..740e964
--- /dev/null
+++ b/nunitlite-runner.sh
@@ -0,0 +1,3 @@
+#!/bin/sh
+
+exec /usr/bin/mono /usr/lib/mono/nunit/nunitlite-runner.exe "$@"