django - pip install pyscopg2 error: cdefs.h not found -


on debian 8, i'm trying setup django 1.10 project. installing requirements have problem. 

$ pip install psycopg2

/usr/include/features.h:374:25: fatal error: sys/cdefs.h: file or directory not found

i search in package cdefs.h is:

$ dpkg -s cdefs.h

libc6-dev:amd64: /usr/include/x86_64-linux-gnu/sys/cdefs.h

i checked if have installed , yes, it's installed.

what strange in same server have django project , it's working!

what i'm forgetting??


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