ffi.h: no such file or directory

[hroman73]

Trying to use sickbeard_mp4_automator which requires requests[security] but when I run pip install requests[security] i get the following error:

x86_64-openwrt-linux-gnu-gcc -fno-strict-aliasing -O2 -pipe -fomit-frame-pointer -fno-caller-saves -fhonour-copts -Wno-error=unused-but-set-variable -Wno-error=unused-result -DNDEBUG -fno-inline -DNDEBUG -O2 -pipe -fomit-frame-pointer -fno-caller-saves -fhonour-copts -Wno-error=unused-but-set-variable -Wno-error=unused-result -fPIC -DUSE__THREAD -DHAVE_SYNC_SYNCHRONIZE -I/usr/include/ffi -I/usr/include/libffi -I/opt/include/python2.7 -c c/_cffi_backend.c -o build/temp.linux-x86_64-2.7/c/_cffi_backend.o
c/_cffi_backend.c:15:17: fatal error: ffi.h: No such file or directory
#include <ffi.h>
^
compilation terminated.
error: command 'x86_64-openwrt-linux-gnu-gcc' failed with exit status 1

----------------------------------------

Command "/opt/bin/python2.7 -u -c "import setuptools, tokenize;file='/share/CACHEDEV1_DATA/.qpkg/Entware-ng/tmp/pip-build-HV2o4K/cffi/setup.py';f=getattr(tokenize, 'open', open)(file);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, file, 'exec'))" install --record /opt/tmp/pip-cVZ2FZ-record/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /share/CACHEDEV1_DATA/.qpkg/Entware-ng/tmp/pip-build-HV2o4K/cffi/

[zyxmon]

My guess you have not unpacked headers as wiki recommends.
We do not support native compilation here, we recommend cross-compilation.
I strongly recommend to install Entware-3x on your Qnap, not Enware-ng.