--- CONFIG/src/atlcomp.txt.orig	2011-08-17 22:10:42.000000000 +0200
+++ CONFIG/src/atlcomp.txt	2011-08-17 22:12:53.000000000 +0200
@@ -49,8 +49,10 @@
    'gcc' '-fomit-frame-pointer -mfpmath=sse -msse3 -O2 -fno-schedule-insns2'
 MACH=Core2 OS=Win9x,WinNT LVL=1005 COMPS=smc,dmc,skc,dkc,icc
    'gcc-4' '-fomit-frame-pointer -mfpmath=sse -msse3 -O2'
-MACH=Core2 OS=ALL LVL=1000 COMPS=smc,dmc,skc,dkc,icc
+MACH=Core2 OS=ALL LVL=950 COMPS=smc,dmc,skc,dkc,icc
    'gcc' '-fomit-frame-pointer -mfpmath=sse -msse3 -O2'
+MACH=Core2 OS=ALL LVL=1000 COMPS=smc,dmc,skc,dkc,icc,xcc
+   'clang' '-fomit-frame-pointer -msse3 -O3'
 MACH=Atom OS=ALL LVL=1000 COMPS=smc,dmc,skc,dkc
    'gcc' '-O3 -fno-schedule-insns2 -funroll-all-loops -fno-tree-ch'
 MACH=Atom OS=ALL LVL=1000 COMPS=icc
