Thanks for apply patches, and repair my english phrases in doc/building!
Please add this patch also.
- FLTK configure with cross ("--host" only is old)
- Protect kernel compiling only if an patched kernel
tree exists (check file include/linux/cooperative.h)
- configure: check compiler version 3.3.x on build system.
Big warning and Help, if old compiler installed on system.
Backup Makefile and config file only, if backup don't exist.
More comments, more checks for needed tools.