Not able to find __NR definitions

[prash_t]

Hi,
I downloaded glibc-2.2.5 source and was looking for 'unistd.h' having 
__NR_xxxx definitions. BUT strangely, there is no such file. Do I have to 
install using any other source for this? Can you please help me. 

[I could find /usr/include/asm/unistd.h on my machine (s390) having the 
definitions.] 

Thanks
Prashanth