Need update on setup instruction

[gobindaakhuli]

I have fedora22 with python 3.4 so pip3.5 is not available on my pc.
when I do try with pip3.4 : pip3.4 install -r requirements.txt
I get:
gcc -pthread -Wno-unused-result -DDYNAMIC_ANNOTATIONS_ENABLED=1 -DNDEBUG -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic -D_GNU_SOURCE -fPIC -fwrapv -fPIC -DUSE__THREAD -I/usr/include/ffi -I/usr/include/libffi -I/usr/include/python3.4m -c c/_cffi_backend.c -o build/temp.linux-x86_64-3.4/c/_cffi_backend.o

c/_cffi_backend.c:15:17: fatal error: ffi.h: No such file or directory

compilation terminated.

error: command 'gcc' failed with exit status 1

----------------------------------------
Command "/usr/bin/python3 -c "import setuptools, tokenize;__file__='/tmp/pip-build-qslojink/cffi/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-vpyemxb6-record/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /tmp/pip-build-qslojink/cffi

this type of error, how do I solve this.

[fabaff]

I'm just guessing but it seems that devel package which contains ffi.h is missing.

[farhaanbukhsh]

I think you need to install python3-devel package!