user program #include problem

[Altera_Forum]

when we design Linux device drivers, we use kernel head files, such as# include <linux/fs.h> 

While we design user programs, what is we can# include?  1. <quartus>/bin/cygwin/usr/include  2. <nios2>/bin/nios2-guntools/H-i686-PC-cygwin/nios2-elf/include  We find first one has more *.h files than second. But we don&#39;t know when we compile the linux user program, which path dose it search? How can we do in "Makefile"?   PS: why do the nios2linux plugs install cygwin in <quartus> directory "again"? nios2-elf-gcc has already in Nios2 IDE? What purpose is the cygwin/gcc ?

[Altera_Forum]

For example, a user program code: 

 #include <termios.h>  error: <div class='quotetop'>QUOTE </div>  --- Quote Start ---  nios2-elf-gcc -c  user.c -o user.o In file included from user.c:7: /cygdrive/d/altera/kits/nios2/bin/nios2-gnutools/H-i686-pc-cygwin/bin/../lib/gcc/nios2-elf/3.4.1/../../../../nios2-elf/include/termios.h:4:25: sys/termios.h: No such file or directory make: *** [user.o] Error 1 nios2-elf-gcc -c  util.c -o util.o In file included from util.c:4: /cygdrive/d/altera/kits/nios2/bin/nios2-gnutools/H-i686-pc-cygwin/bin/../lib/gcc/nios2-elf/3.4.1/../../../../nios2-elf/include/termios.h:4:25: sys/termios.h: No such file or directory[/b]  --- Quote End ---  

[Altera_Forum]

Update your include path. 

 <div class='quotetop'>QUOTE </div>  --- Quote Start ---  nios2-elf-gcc -c  user.c -o user.o[/b]  --- Quote End ---     nios2-elf-gcc -c user.c -I/**yourpath**/com.mictrotronix.nios2linux.uClibc_1.4.0/include -o user.o   Doug