diff --git a/microsoft-gsl.spec b/microsoft-gsl.spec
index 7b339f7..d90d5b0 100644
--- a/microsoft-gsl.spec
+++ b/microsoft-gsl.spec
@@ -1,6 +1,6 @@
 Name:          microsoft-gsl
 Version:       4.0.0
-Release:       1mamba
+Release:       2mamba
 Summary:       Functions and types that are suggested for use by the C++ Core Guidelines maintained by the Standard C++ Foundation
 Group:         Development/Libraries
 Vendor:        openmamba
@@ -40,6 +40,7 @@ This package contains libraries and header files for developing applications tha
 
 %build
 %cmake -d build \
+   -DCMAKE_INSTALL_INCLUDEDIR=%{_includedir}/microsoft \
    -DGSL_TEST=OFF
 
 %make
@@ -53,13 +54,17 @@ This package contains libraries and header files for developing applications tha
 
 %files -n lib%{name}-devel
 %defattr(-,root,root)
-%dir %{_includedir}/gsl
-%{_includedir}/gsl/*
+%dir %{_includedir}/microsoft
+%dir %{_includedir}/microsoft/gsl
+%{_includedir}/microsoft/gsl/*
 %dir %{_datadir}/cmake/Microsoft.GSL
 %{_datadir}/cmake/Microsoft.GSL/Microsoft.GSLConfig*.cmake
 %doc LICENSE
 
 %changelog
+* Thu Apr 28 2022 Silvan Calarco <silvan.calarco@mambasoft.it> 4.0.0-2mamba
+- install below %_includedir/microsoft to avoid conflicts with libgsl
+
 * Thu Jan 27 2022 Automatic Build System <autodist@mambasoft.it> 4.0.0-1mamba
 - automatic version update by autodist