%general-entities; ]> Glibc CFLAGS="-march=$(cut -d- -f1 <<< $MACHTYPE) \ -mtune=generic -g -O2" ../glibc-&glibc-version;/configure --prefix=/usr \ --disable-profile --enable-add-ons --enable-kernel=2.6.0 \ --libexecdir=/usr/lib/glibc The math tests, at least on i686, fail in the test-double and test-idouble tests with gcc-&gcc-version; . These two failures in the math tests appear to be harmless. The math tests may also fail on systems where the CPU is not a relatively new genuine Intel or authentic AMD. Certain optimization settings are also known to be a factor here. If you have mounted the CLFS partition with the noatime option, the atime test will fail. As mentioned in , do not use the noatime option while building CLFS. When running on older and slower hardware, some tests can fail because of test timeouts being exceeded.