diff --git a/potrace.spec b/potrace.spec
index 9c6da99..944cd58 100644
--- a/potrace.spec
+++ b/potrace.spec
@@ -1,6 +1,6 @@
 Name:          potrace
 Version:       1.16
-Release:       1mamba
+Release:       2mamba
 Summary:       Transforms bitmaps into vector graphics
 Group:         Graphical Desktop/Applications/Graphics
 Vendor:        openmamba
@@ -12,8 +12,10 @@ Patch:         %{name}-1.8-xfig.patch
 License:       GPL
 ## AUTOBUILDREQ-BEGIN
 BuildRequires: glibc-devel
+BuildRequires: ldconfig
 BuildRequires: libz-devel
 ## AUTOBUILDREQ-END
+Requires:      %{name} = %{?epoch:%epoch:}%{version}-%{release}
 BuildRoot:     %{_tmppath}/%{name}-%{version}-root
 
 %description
@@ -22,12 +24,33 @@ The input is a portable bitmap (PBM), and the default output is an encapsulated
 A typical use is to create EPS files from scanned data, such as company or university logos, handwritten notes, etc.
 The resulting image is not "jaggy" like a bitmap, but smooth, and it can be scaled to any resolution.
 
+%package -n lib%{name}
+Group:         System/Libraries
+Summary:       Shared library provided with %{name}
+
+%description -n lib%{name}
+This package contains the shared library provided with %{name}.
+
+%package -n lib%{name}-devel
+Group:         Development/Libraries
+Summary:       Development files for %{name}
+Requires:      %{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
 #%patch -p0
 
 %build
-%configure
+%configure \
+   --with-libpotrace \
+   --enable-metric \
+   --enable-a4
+
 %make
 
 %install
@@ -37,6 +60,9 @@ The resulting image is not "jaggy" like a bitmap, but smooth, and it can be scal
 %clean
 [ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
 
+%post -n lib%{name} -p /sbin/ldconfig
+%postun -n lib%{name} -p /sbin/ldconfig
+
 %files
 %defattr(-,root,root)
 %{_bindir}//mkbitmap
@@ -45,9 +71,24 @@ The resulting image is not "jaggy" like a bitmap, but smooth, and it can be scal
 %{_mandir}/man1/potrace.*
 %dir %{_docdir}/potrace
 %{_docdir}/potrace/placement.pdf
-%doc AUTHORS COPYING ChangeLog NEWS README
+
+%files -n lib%{name}
+%defattr(-,root,root)
+%{_libdir}/libpotrace.so.*
+%doc AUTHORS COPYING
+
+%files -n lib%{name}-devel
+%defattr(-,root,root)
+%{_includedir}/potracelib.h
+%{_libdir}/libpotrace.a
+%{_libdir}/libpotrace.la
+%{_libdir}/libpotrace.so
+%doc ChangeLog NEWS README
 
 %changelog
+* Wed May 13 2020 Silvan Calarco <silvan.calarco@mambasoft.it> 1.16-2mamba
+- rebuilt with shared library
+
 * Fri Sep 20 2019 Automatic Build System <autodist@mambasoft.it> 1.16-1mamba
 - automatic version update by autodist