I am trying to install scrapy, it gives the following error:
Downloading/unpacking cryptography>=0.2.1 (from pyOpenSSL->Scrapy) Running setup.py egg_info for package cryptography Package libffi was not found in the pkg-config search path. Perhaps you should add the directory containing `libffi.pc' to the PKG_CONFIG_PATH environment variable No package 'libffi' found Package libffi was not found in the pkg-config search path. Perhaps you should add the directory containing `libffi.pc' to the PKG_CONFIG_PATH environment variable No package 'libffi' found Package libffi was not found in the pkg-config search path. Perhaps you should add the directory containing `libffi.pc' to the PKG_CONFIG_PATH environment variable No package 'libffi' found Package libffi was not found in the pkg-config search path. Perhaps you should add the directory containing `libffi.pc' to the PKG_CONFIG_PATH environment variable No package 'libffi' found Package libffi was not found in the pkg-config search path. Perhaps you should add the directory containing `libffi.pc' to the PKG_CONFIG_PATH environment variable No package 'libffi' found c/_cffi_backend.c:13:17: fatal error: ffi.h: No such file or directory compilation terminated. Traceback (most recent call last): File "<string>", line 14, in <module> File "/home/nilesh/build/cryptography/setup.py", line 174, in <module> "test": PyTest, File "/usr/lib/python2.7/distutils/core.py", line 112, in setup _setup_distribution = dist = klass(attrs) File "/usr/lib/python2.7/dist-packages/setuptools/dist.py", line 221, in __init__ self.fetch_build_eggs(attrs.pop('setup_requires')) File "/usr/lib/python2.7/dist-packages/setuptools/dist.py", line 245, in fetch_build_eggs parse_requirements(requires), installer=self.fetch_build_egg File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 576, in resolve dist = best[req.key] = env.best_match(req, self, installer) File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 821, in best_match return self.obtain(req, installer) # try and download/install File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 833, in obtain return installer(requirement) File "/usr/lib/python2.7/dist-packages/setuptools/dist.py", line 294, in fetch_build_egg return cmd.easy_install(req) File "/usr/lib/python2.7/dist-packages/setuptools/command/easy_install.py", line 608, in easy_install return self.install_item(spec, dist.location, tmpdir, deps) File "/usr/lib/python2.7/dist-packages/setuptools/command/easy_install.py", line 638, in install_item dists = self.install_eggs(spec, download, tmpdir) File "/usr/lib/python2.7/dist-packages/setuptools/command/easy_install.py", line 828, in install_eggs return self.build_and_install(setup_script, setup_base) File "/usr/lib/python2.7/dist-packages/setuptools/command/easy_install.py", line 1105, in build_and_install self.run_setup(setup_script, setup_base, args) File "/usr/lib/python2.7/dist-packages/setuptools/command/easy_install.py", line 1096, in run_setup raise DistutilsError("Setup script exited with %s" % (v.args[0],)) distutils.errors.DistutilsError: Setup script exited with error: command 'gcc' failed with exit status 1 Complete output from command python setup.py egg_info: Package libffi was not found in the pkg-config search path. Perhaps you should add the directory containing `libffi.pc' to the PKG_CONFIG_PATH environment variable No package 'libffi' found Package libffi was not found in the pkg-config search path. Perhaps you should add the directory containing `libffi.pc' to the PKG_CONFIG_PATH environment variable No package 'libffi' found Package libffi was not found in the pkg-config search path. Perhaps you should add the directory containing `libffi.pc' to the PKG_CONFIG_PATH environment variable No package 'libffi' found Package libffi was not found in the pkg-config search path. Perhaps you should add the directory containing `libffi.pc' to the PKG_CONFIG_PATH environment variable No package 'libffi' found Package libffi was not found in the pkg-config search path. Perhaps you should add the directory containing `libffi.pc' to the PKG_CONFIG_PATH environment variable No package 'libffi' found c/_cffi_backend.c:13:17: fatal error: ffi.h: No such file or directory compilation terminated. Traceback (most recent call last): File "<string>", line 14, in <module> File "/home/nilesh/build/cryptography/setup.py", line 174, in <module> "test": PyTest, File "/usr/lib/python2.7/distutils/core.py", line 112, in setup _setup_distribution = dist = klass(attrs) File "/usr/lib/python2.7/dist-packages/setuptools/dist.py", line 221, in __init__ self.fetch_build_eggs(attrs.pop('setup_requires')) File "/usr/lib/python2.7/dist-packages/setuptools/dist.py", line 245, in fetch_build_eggs parse_requirements(requires), installer=self.fetch_build_egg File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 576, in resolve dist = best[req.key] = env.best_match(req, self, installer) File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 821, in best_match return self.obtain(req, installer) # try and download/install File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 833, in obtain return installer(requirement) File "/usr/lib/python2.7/dist-packages/setuptools/dist.py", line 294, in fetch_build_egg return cmd.easy_install(req) File "/usr/lib/python2.7/dist-packages/setuptools/command/easy_install.py", line 608, in easy_install return self.install_item(spec, dist.location, tmpdir, deps) File "/usr/lib/python2.7/dist-packages/setuptools/command/easy_install.py", line 638, in install_item dists = self.install_eggs(spec, download, tmpdir) File "/usr/lib/python2.7/dist-packages/setuptools/command/easy_install.py", line 828, in install_eggs return self.build_and_install(setup_script, setup_base) File "/usr/lib/python2.7/dist-packages/setuptools/command/easy_install.py", line 1105, in build_and_install self.run_setup(setup_script, setup_base, args) File "/usr/lib/python2.7/dist-packages/setuptools/command/easy_install.py", line 1096, in run_setup raise DistutilsError("Setup script exited with %s" % (v.args[0],)) distutils.errors.DistutilsError: Setup script exited with error: command 'gcc' failed with exit status 1 Can you please help me in solving the error.