--- libs/log/build/Jamfile.v2~	2015-04-04 18:33:00.000000000 +0100
+++ libs/log/build/Jamfile.v2	2016-02-25 22:50:32.871359855 +0000
@@ -249,7 +249,7 @@
             result = ;
             if <toolset>gcc in $(properties) || <toolset>clang in $(properties)
             {
-                result = <cxxflags>"-march=core2 -msse -msse2 -msse3 -mssse3" ;
+                result = <cxxflags>"-msse -msse2 -msse3 -mssse3" ;
             }
             else if <toolset>intel in $(properties)
             {
@@ -311,7 +311,7 @@
             result = ;
             if <toolset>gcc in $(properties)
             {
-                result = <cxxflags>"-march=core-avx2 -mavx -mavx2 -fabi-version=0" ;
+                result = <cxxflags>"-mavx -mavx2 -fabi-version=0" ;
             }
             else if <toolset>clang in $(properties)
             {