Thanks, I found your notes on using git and got stuck at point 4 as follows: inux-wda0:~/bug907092/linux # git checkout v3.14 Checking out files: 100% (16601/16601), done. Previous HEAD position was 19583ca... Linux 3.16 HEAD is now at 455c6fd... Linux 3.14 linux-wda0:~/bug907092/linux # make localmodconfig HOSTCC scripts/basic/fixdep /bin/sh: gcc: command not found scripts/Makefile.host:118: recipe for target 'scripts/basic/fixdep' failed make[1]: *** [scripts/basic/fixdep] Error 127 Makefile:428: recipe for target 'scripts_basic' failed make: *** [scripts_basic] Error 2 Have I missed a parameter following localmodconfig ?