diff --git a/i2c-tools.spec b/i2c-tools.spec
index de63bbe..fe77e1a 100644
--- a/i2c-tools.spec
+++ b/i2c-tools.spec
@@ -1,5 +1,5 @@
 Name:          i2c-tools
-Version:       3.1.2
+Version:       4.0
 Release:       1mamba
 Summary:       A heterogeneous set of I2C tools for Linux
 Group:         System/Kernel and Hardware
@@ -7,17 +7,34 @@ Vendor:        openmamba
 Distribution:  openmamba
 Packager:      Silvan Calarco <silvan.calarco@mambasoft.it>
 URL:           http://www.lm-sensors.org/wiki/I2CTools
-Source:        http://dl.lm-sensors.org/i2c-tools/releases/i2c-tools-%{version}.tar.bz2
+Source:        git://git.kernel.org/pub/scm/utils/i2c-tools/i2c-tools.git/v%{version}/i2c-tools-%{version}.tar.bz2
+#Source:        http://dl.lm-sensors.org/i2c-tools/releases/i2c-tools-%{version}.tar.bz2
 License:       GPL
 ## AUTOBUILDREQ-BEGIN
 BuildRequires: glibc-devel
 BuildRequires: perl-devel
 ## AUTOBUILDREQ-END
+Requires:      libi2c = %{?epoch:%epoch:}%{version}-%{release}
 BuildRoot:     %{_tmppath}/%{name}-%{version}-root
 
 %description
 The i2c-tools package contains a heterogeneous set of I2C tools for Linux: a bus probing tool, a chip dumper, register-level SMBus access helpers, EEPROM decoding scripts, EEPROM programming tools, and a python module for SMBus access.
 
+%package -n libi2c
+Group:         System/Libraries
+Summary:       Shared libraries for %{name}
+
+%description -n libi2c
+This package contains shared libraries for %{name}.
+
+%package -n libi2c-devel
+Group:         Development/Libraries
+Summary:       Development files for %{name}
+Requires:      libi2c = %{?epoch:%epoch:}%{version}-%{release}
+
+%description -n libi2c-devel
+This package contains development files for %{name}.
+
 %prep
 %setup -q
 
@@ -33,6 +50,9 @@ rm -f %{buildroot}%{_includedir}/linux/i2c-dev.h
 %clean
 [ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
 
+%post -n libi2c -p /sbin/ldconfig
+%postun -n libi2c -p /sbin/ldconfig
+
 %files
 %defattr(-,root,root)
 %{_bindir}/ddcmon
@@ -44,13 +64,27 @@ rm -f %{buildroot}%{_includedir}/linux/i2c-dev.h
 %{_sbindir}/i2cdump
 %{_sbindir}/i2cget
 %{_sbindir}/i2cset
+%{_sbindir}/i2ctransfer
 %{_mandir}/man1/decode-dimms.1*
 %{_mandir}/man1/decode-vaio.1*
 %{_mandir}/man8/i2c*.8*
-%doc COPYING
 #CHANGES README
 
+%files -n libi2c
+%defattr(-,root,root)
+%{_prefix}/lib/libi2c.so.*
+%doc COPYING
+
+%files -n libi2c-devel
+%defattr(-,root,root)
+%{_includedir}/i2c/smbus.h
+%{_prefix}/lib/libi2c.a
+%{_prefix}/lib/libi2c.so
+
 %changelog
+* Sun Jul 29 2018 Silvan Calarco <silvan.calarco@mambasoft.it> 4.0-1mamba
+- update to 4.0
+
 * Wed Jul 01 2015 Automatic Build System <autodist@mambasoft.it> 3.1.2-1mamba
 - automatic update by autodist