Dear all: I try to build external modules with 2.6.31.19-generic headers in my ubuntu9.10. I type "make clean" in the 2.6.31.19-generic-headers and that delete my bounds.h. >From website, http://bbs.archlinux.org/viewtopic.php?pid=695783, I try to use make prepare to save it back, and I get error message as: /usr/src/linux-headers-2.6.31-19-generic# make prepare CHK include/linux/version.h CHK include/linux/utsrelease.h SYMLINK include/asm -> include/asm-x86 make[1]: *** No rule to make target `kernel/bounds.c', needed by `kernel/bounds.s'. Stop. make: *** [prepare0] Error 2 /usr/src/linux-headers-2.6.31-19-generic# But I can successfully generate it by "make prepare" under 2.6.27. /media/sdb1/software/linux/linux-source-2.6.27# make prepare CHK include/linux/version.h CHK include/linux/utsrelease.h HOSTCC scripts/basic/fixdep scripts/basic/fixdep.c: In function ‘traps’: scripts/basic/fixdep.c:377: warning: dereferencing type-punned pointer will break strict-aliasing rules scripts/basic/fixdep.c:379: warning: dereferencing type-punned pointer will break strict-aliasing rules HOSTCC scripts/basic/docproc CC kernel/bounds.s GEN include/linux/bounds.h CC arch/x86/kernel/asm-offsets.s GEN include/asm/asm-offsets.h CALL scripts/checksyscalls.sh /media/sdb1/software/linux/linux-source-2.6.27# cd .. my questions are: 1. why we need this bounds.h ? 2, is that wrong type "make prepare/clean" under header files? 3. I find 'bounds.h' is not created before 2.6.20, since I cannot find it when I build 2.6.20. appreciate your help, miloody -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ