diff --git a/i2c-tools.spec b/i2c-tools.spec
index 303fef0..08b5ba4 100644
--- a/i2c-tools.spec
+++ b/i2c-tools.spec
@@ -1,6 +1,6 @@
 Name:          i2c-tools
-Version:       4.0
-Release:       2mamba
+Version:       4.1
+Release:       1mamba
 Summary:       A heterogeneous set of I2C tools for Linux
 Group:         System/Kernel and Hardware
 Vendor:        openmamba
@@ -39,11 +39,11 @@ This package contains development files for %{name}.
 %setup -q
 
 %build
-%make prefix=%{_prefix} libdir=%{_libdir}
+%make PREFIX=%{_prefix} libdir=%{_libdir}
 
 %install
 [ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
-%makeinstall prefix=%{_prefix} libdir=%{_libdir}
+%makeinstall PREFIX=%{_prefix} libdir=%{_libdir}
 
 rm -f %{buildroot}%{_includedir}/linux/i2c-dev.h
 
@@ -83,6 +83,9 @@ rm -f %{buildroot}%{_includedir}/linux/i2c-dev.h
 %{_libdir}/libi2c.so
 
 %changelog
+* Sat Jan 12 2019 Automatic Build System <autodist@mambasoft.it> 4.1-1mamba
+- automatic version update by autodist
+
 * Thu Sep 13 2018 Silvan Calarco <silvan.calarco@mambasoft.it> 4.0-2mamba
 - x86_64: fix library path