[tinydtls-dev] Fatal Error : unistd.h no such file or directory - reg

["joseph s.l. (slj1u17)" <slj1u17@xxxxxxxxxxx>]

Hello Team,

I am trying to simulate TinyDTLS in Contiki, and I have cloned the code from git://git.eclipse.org/gitroot/tinydtls/org.eclipse.tinydtls.git.

I am getting an error when I try to compile dtls-server.c using Cooja simulator: 

"Fatal Error : unistd.h no such file or directory" 

I tried linking the /usr/include/asm-generic with asm folder (after doing build essentials) and when i tried to list the files under both I could see that unistd.h is present under both.

I tried to edit the header file in the dtls-server.c by using

#include <asm/unistd.h> or #include<asm-generic/unistd.h>

 or 

#include "/usr/include/asm/unistd.h" (this gives a header length too long message)

But unfortunately nothing works.

Kindly help me by providing suggestions on how to resolve this issue at the earliest possible please.

Thanks in advance.