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I have managed (with some help) so solve the problem. The problem is that after installation, the pycurl.so is not copied to the site-packages for this virtualenv. When installing via <code>pip -v install pycurl</code>, the following output is given: <pre><code>Downloading/unpacking pycurl Using version 7.19.0 (newest of versions: 7.19.0, 7.19.0, 7.18.2, 7.18.1, 7.16.4, 7.16.2.1, 7.16.2, 7.16.1, 7.15.5.1) Downloading pycurl-7.19.0.tar.gz (71Kb): 71Kb downloaded Running setup.py egg_info for package pycurl Using curl-config (libcurl 7.19.7) running egg_info creating pip-egg-info/pycurl.egg-info writing pip-egg-info/pycurl.egg-info/PKG-INFO writing top-level names to pip-egg-info/pycurl.egg-info/top_level.txt writing dependency_links to pip-egg-info/pycurl.egg-info/dependency_links.txt writing manifest file 'pip-egg-info/pycurl.egg-info/SOURCES.txt' warning: manifest_maker: standard file '-c' not found reading manifest file 'pip-egg-info/pycurl.egg-info/SOURCES.txt' reading manifest template 'MANIFEST.in' writing manifest file 'pip-egg-info/pycurl.egg-info/SOURCES.txt' Installing collected packages: pycurl Running setup.py install for pycurl Using curl-config (libcurl 7.19.7) running install running build running build_py creating build creating build/lib.linux-x86_64-2.7 creating build/lib.linux-x86_64-2.7/curl copying python/curl/__init__.py -> build/lib.linux-x86_64-2.7/curl running build_ext building 'pycurl' extension creating build/temp.linux-x86_64-2.7 creating build/temp.linux-x86_64-2.7/src gcc -pthread -fno-strict-aliasing -g -O2 -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -fPIC -DHAVE_CURL_SSL=1 -I/opt/python2.7/include/python2.7 -c src/pycurl.c -o build/temp.linux-x86_64-2.7/src/pycurl.o src/pycurl.c:85:4: warning: #warning "libcurl was compiled with SSL support, but configure could not determine which " "library was used; thus no SSL crypto locking callbacks will be set, which may " "cause random crashes on SSL requests" src/pycurl.c: In function ‘do_multi_info_read’: src/pycurl.c:2843: warning: call to ‘_curl_easy_getinfo_err_string’ declared with attribute warning: curl_easy_getinfo expects a pointer to char * for this info src/pycurl.c: In function ‘multi_socket_callback’: src/pycurl.c:2355: warning: call to ‘_curl_easy_getinfo_err_string’ declared with attribute warning: curl_easy_getinfo expects a pointer to char * for this info In function ‘util_curl_unsetopt’, inlined from ‘do_curl_unsetopt’ at src/pycurl.c:1551: src/pycurl.c:1476: warning: call to ‘_curl_easy_setopt_err_CURLSH’ declared with attribute warning: curl_easy_setopt expects a CURLSH* argument for this option gcc -pthread -shared build/temp.linux-x86_64-2.7/src/pycurl.o -L/opt/python2.7/lib -lcurl -lpython2.7 -o build/lib.linux-x86_64-2.7/pycurl.so unknown option: --static-libs Usage: curl-config [OPTION] Available values for OPTION include: --ca ca bundle install path --cc compiler --cflags pre-processor and compiler flags --checkfor [version] check for (lib)curl of the specified version --features newline separated list of enabled features --help display this help and exit --libs library linking information --prefix curl install prefix --protocols newline separated list of enabled protocols --version output version information --vernum output the version information as a number (hexadecimal) gcc (GCC) 4.4.4 20100726 (Red Hat 4.4.4-13) Copyright (C) 2010 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. running install_lib creating /home/ec2-user/.virtualenvs/xxx/lib/python2.7/site-packages/curl copying build/lib.linux-x86_64-2.7/curl/__init__.py -> /home/ec2-user/.virtualenvs/xxx/lib/python2.7/site-packages/curl byte-compiling /home/ec2-user/.virtualenvs/xxx/lib/python2.7/site-packages/curl/__init__.py to __init__.pyc running install_data copying ChangeLog -> /home/ec2-user/.virtualenvs/xxx/share/doc/pycurl copying COPYING -> /home/ec2-user/.virtualenvs/xxx/share/doc/pycurl copying COPYING2 -> /home/ec2-user/.virtualenvs/xxx/share/doc/pycurl copying INSTALL -> /home/ec2-user/.virtualenvs/xxx/share/doc/pycurl copying README -> /home/ec2-user/.virtualenvs/xxx/share/doc/pycurl copying TODO -> /home/ec2-user/.virtualenvs/xxx/share/doc/pycurl copying doc/curlshareobject.html -> /home/ec2-user/.virtualenvs/xxx/share/doc/pycurl/html copying doc/pycurl.html -> /home/ec2-user/.virtualenvs/xxx/share/doc/pycurl/html copying doc/curlobject.html -> /home/ec2-user/.virtualenvs/xxx/share/doc/pycurl/html copying doc/curlmultiobject.html -> /home/ec2-user/.virtualenvs/xxx/share/doc/pycurl/html copying doc/callbacks.html -> /home/ec2-user/.virtualenvs/xxx/share/doc/pycurl/html copying examples/retriever.py -> /home/ec2-user/.virtualenvs/xxx/share/doc/pycurl/examples copying examples/file_upload.py -> /home/ec2-user/.virtualenvs/xxx/share/doc/pycurl/examples copying examples/linksys.py -> /home/ec2-user/.virtualenvs/xxx/share/doc/pycurl/examples copying examples/xmlrpc_curl.py -> /home/ec2-user/.virtualenvs/xxx/share/doc/pycurl/examples copying examples/retriever-multi.py -> /home/ec2-user/.virtualenvs/xxx/share/doc/pycurl/examples copying examples/sfquery.py -> /home/ec2-user/.virtualenvs/xxx/share/doc/pycurl/examples copying examples/basicfirst.py -> /home/ec2-user/.virtualenvs/xxx/share/doc/pycurl/examples copying tests/test.py -> /home/ec2-user/.virtualenvs/xxx/share/doc/pycurl/tests copying tests/test_ftp.py -> /home/ec2-user/.virtualenvs/xxx/share/doc/pycurl/tests copying tests/test_share.py -> /home/ec2-user/.virtualenvs/xxx/share/doc/pycurl/tests copying tests/test_multi5.py -> /home/ec2-user/.virtualenvs/xxx/share/doc/pycurl/tests copying tests/test_multi_timer.py -> /home/ec2-user/.virtualenvs/xxx/share/doc/pycurl/tests copying tests/test_post.py -> /home/ec2-user/.virtualenvs/xxx/share/doc/pycurl/tests copying tests/test_gtk.py -> /home/ec2-user/.virtualenvs/xxx/share/doc/pycurl/tests copying tests/test_post3.py -> /home/ec2-user/.virtualenvs/xxx/share/doc/pycurl/tests copying tests/test_debug.py -> /home/ec2-user/.virtualenvs/xxx/share/doc/pycurl/tests copying tests/test_multi4.py -> /home/ec2-user/.virtualenvs/xxx/share/doc/pycurl/tests copying tests/test_cb.py -> /home/ec2-user/.virtualenvs/xxx/share/doc/pycurl/tests copying tests/test_multi_vs_thread.py -> /home/ec2-user/.virtualenvs/xxx/share/doc/pycurl/tests copying tests/test_stringio.py -> /home/ec2-user/.virtualenvs/xxx/share/doc/pycurl/tests copying tests/test_xmlrpc.py -> /home/ec2-user/.virtualenvs/xxx/share/doc/pycurl/tests copying tests/test_multi_socket_select.py -> /home/ec2-user/.virtualenvs/xxx/share/doc/pycurl/tests copying tests/test_multi6.py -> /home/ec2-user/.virtualenvs/xxx/share/doc/pycurl/tests copying tests/test_multi_socket.py -> /home/ec2-user/.virtualenvs/xxx/share/doc/pycurl/tests copying tests/test_multi.py -> /home/ec2-user/.virtualenvs/xxx/share/doc/pycurl/tests copying tests/util.py -> /home/ec2-user/.virtualenvs/xxx/share/doc/pycurl/tests copying tests/test_multi3.py -> /home/ec2-user/.virtualenvs/xxx/share/doc/pycurl/tests copying tests/test_internals.py -> /home/ec2-user/.virtualenvs/xxx/share/doc/pycurl/tests copying tests/test_post2.py -> /home/ec2-user/.virtualenvs/xxx/share/doc/pycurl/tests copying tests/test_memleak.py -> /home/ec2-user/.virtualenvs/xxx/share/doc/pycurl/tests copying tests/test_multi2.py -> /home/ec2-user/.virtualenvs/xxx/share/doc/pycurl/tests copying tests/test_socketopen.py -> /home/ec2-user/.virtualenvs/xxx/share/doc/pycurl/tests copying tests/test_getinfo.py -> /home/ec2-user/.virtualenvs/xxx/share/doc/pycurl/tests running install_egg_info running egg_info creating pycurl.egg-info writing pycurl.egg-info/PKG-INFO writing top-level names to pycurl.egg-info/top_level.txt writing dependency_links to pycurl.egg-info/dependency_links.txt writing manifest file 'pycurl.egg-info/SOURCES.txt' warning: manifest_maker: standard file '-c' not found reading manifest file 'pycurl.egg-info/SOURCES.txt' reading manifest template 'MANIFEST.in' writing manifest file 'pycurl.egg-info/SOURCES.txt' Copying pycurl.egg-info to /home/ec2-user/.virtualenvs/xxx/lib/python2.7/site-packages/pycurl-7.19.0-py2.7.egg-info running install_scripts writing list of installed files to '/tmp/pip-lEWzoB-record/install-record.txt' Successfully installed pycurl Cleaning up... Removing temporary dir /home/ec2-user/.virtualenvs/xxx/build... </code></pre> The key error here is: <code>gcc -pthread -shared build/temp.linux-x86_64-2.7/src/pycurl.o -L/opt/python2.7/lib -lcurl -lpython2.7 -o build/lib.linux-x86_64-2.7/pycurl.so unknown option: --static-libs Usage: curl-config [OPTION] Available values for OPTION include: --ca ca bundle install path --cc compiler --cflags pre-processor and compiler flags --checkfor [version] check for (lib)curl of the specified version --features newline separated list of enabled features --help display this help and exit --libs library linking information --prefix curl install prefix --protocols newline separated list of enabled protocols --version output version information --vernum output the version information as a number (hexadecimal)</code> Which shows that <code>curl-config</code> is being called with the argument <code>--static-libs</code>, which it fails to recognise and instead prints it's 'usage' output. Most importantly, it is returning a non-error-code output which makes the compiler assume the <code>pycurl.so</code> compilation was successful. This is described in more detail <a href="http://yz.mit.edu/wp/cute-silent-failure-building-pycurl/" rel="noreferrer">here</a> The solution to this problem was to modify the pycurl's setup.py and change line 101 to read <code>--libs</code> instead of <code>--static-libs</code>. This causes <code>pycurl.so</code> to be built and copied to the <code>site-packages</code> directory successfully.
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1. COThis just saved my day. Have been going crazy trying to install it in my virtualenv. Thanks!
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