usb wireless mouse freeze periodically in ubuntu 12.04 lts, edit /boot/grub/grub.cfg, add a boot option irqpoll will fix it
I cross compile the libel 0.8.13 on my ubuntu 12.04lts. I used the below command to configure it. The compile process is success and installed it correct. But inside the include/libelf/sys_elf.h, it includes a missing header file (elf.h). Just comment it out, and it will works.
All the .h file in the sys directory will be included when compiling the files in your sys/XXX. They (sys/*.h) will not be copied to the output directoy, that mean they are just used for compile only.