pietrodn
commented
6 years ago Which hardware platform and operating system are you using?
lxml is a big package and takes a lot of time to build from sources. Try to install it from the binary repositories of your distribution, not from pip.
On Debian, it's as simple as: sudo apt-get install python-lxml.
Since you're building on ARM, you may find the piwheels project useful, since it has ARM builds of lxml and other packages. That would allow you to install lxml with pip.
If you want or need to build lxml from sources, this StackOverflow answer should help you solve the linking problem.
I run this command sudo pip install --upgrade droneapi always appear lxml faild and wait long time install. shoud I use pip install lxml?
The directory '/home/farsight/.cache/pip' or its parent directory is not owned by the current user and caching wheels has been disabled. check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag. Requirement already up-to-date: droneapi in /usr/local/lib/python2.7/dist-packages Requirement already up-to-date: pymavlink>=1.1.50 in /usr/local/lib/python2.7/dist-packages (from droneapi) Requirement already up-to-date: MAVProxy>=1.4.13 in /usr/local/lib/python2.7/dist-packages (from droneapi) Requirement already up-to-date: protobuf>=2.5.0 in /usr/local/lib/python2.7/dist-packages (from droneapi) Requirement already up-to-date: requests==2.5.1 in /usr/local/lib/python2.7/dist-packages (from droneapi) Requirement already up-to-date: future in /usr/local/lib/python2.7/dist-packages (from pymavlink>=1.1.50->droneapi) Collecting lxml (from pymavlink>=1.1.50->droneapi) Using cached lxml-4.1.1.tar.gz Collecting pyserial>=3.0 (from MAVProxy>=1.4.13->droneapi) Using cached pyserial-3.4-py2.py3-none-any.whl Requirement already up-to-date: six>=1.9 in /usr/local/lib/python2.7/dist-packages (from protobuf>=2.5.0->droneapi) Requirement already up-to-date: setuptools in /usr/local/lib/python2.7/dist-packages (from protobuf>=2.5.0->droneapi) Installing collected packages: lxml, pyserial Running setup.py install for lxml ... \
error Complete output from command /usr/bin/python -u -c "import setuptools, tokenize;file='/tmp/pip-build-1jQTmj/lxml/setup.py';f=getattr(tokenize, 'open', open)(file);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, file, 'exec'))" install --record /tmp/pip-Z535dk-record/install-record.txt --single-version-externally-managed --compile: Building lxml version 4.1.1. Building without Cython. Using build configuration of libxslt 1.1.28 running install running build running build_py creating build creating build/lib.linux-armv7l-2.7 creating build/lib.linux-armv7l-2.7/lxml copying src/lxml/sax.py -> build/lib.linux-armv7l-2.7/lxml copying src/lxml/pyclasslookup.py -> build/lib.linux-armv7l-2.7/lxml copying src/lxml/_elementpath.py -> build/lib.linux-armv7l-2.7/lxml copying src/lxml/ElementInclude.py -> build/lib.linux-armv7l-2.7/lxml copying src/lxml/doctestcompare.py -> build/lib.linux-armv7l-2.7/lxml copying src/lxml/init.py -> build/lib.linux-armv7l-2.7/lxml copying src/lxml/usedoctest.py -> build/lib.linux-armv7l-2.7/lxml copying src/lxml/cssselect.py -> build/lib.linux-armv7l-2.7/lxml copying src/lxml/builder.py -> build/lib.linux-armv7l-2.7/lxml creating build/lib.linux-armv7l-2.7/lxml/includes copying src/lxml/includes/init.py -> build/lib.linux-armv7l-2.7/lxml/includes creating build/lib.linux-armv7l-2.7/lxml/html copying src/lxml/html/formfill.py -> build/lib.linux-armv7l-2.7/lxml/html copying src/lxml/html/html5parser.py -> build/lib.linux-armv7l-2.7/lxml/html copying src/lxml/html/clean.py -> build/lib.linux-armv7l-2.7/lxml/html copying src/lxml/html/diff.py -> build/lib.linux-armv7l-2.7/lxml/html copying src/lxml/html/ElementSoup.py -> build/lib.linux-armv7l-2.7/lxml/html copying src/lxml/html/_diffcommand.py -> build/lib.linux-armv7l-2.7/lxml/html copying src/lxml/html/_html5builder.py -> build/lib.linux-armv7l-2.7/lxml/html copying src/lxml/html/soupparser.py -> build/lib.linux-armv7l-2.7/lxml/html copying src/lxml/html/init.py -> build/lib.linux-armv7l-2.7/lxml/html copying src/lxml/html/usedoctest.py -> build/lib.linux-armv7l-2.7/lxml/html copying src/lxml/html/_setmixin.py -> build/lib.linux-armv7l-2.7/lxml/html copying src/lxml/html/builder.py -> build/lib.linux-armv7l-2.7/lxml/html copying src/lxml/html/defs.py -> build/lib.linux-armv7l-2.7/lxml/html creating build/lib.linux-armv7l-2.7/lxml/isoschematron copying src/lxml/isoschematron/init.py -> build/lib.linux-armv7l-2.7/lxml/isoschematron copying src/lxml/etree.h -> build/lib.linux-armv7l-2.7/lxml copying src/lxml/etree_api.h -> build/lib.linux-armv7l-2.7/lxml copying src/lxml/lxml.etree.h -> build/lib.linux-armv7l-2.7/lxml copying src/lxml/lxml.etree_api.h -> build/lib.linux-armv7l-2.7/lxml copying src/lxml/includes/schematron.pxd -> build/lib.linux-armv7l-2.7/lxml/includes copying src/lxml/includes/xpath.pxd -> build/lib.linux-armv7l-2.7/lxml/includes copying src/lxml/includes/uri.pxd -> build/lib.linux-armv7l-2.7/lxml/includes copying src/lxml/includes/xslt.pxd -> build/lib.linux-armv7l-2.7/lxml/includes copying src/lxml/includes/init.pxd -> build/lib.linux-armv7l-2.7/lxml/includes copying src/lxml/includes/c14n.pxd -> build/lib.linux-armv7l-2.7/lxml/includes copying src/lxml/includes/relaxng.pxd -> build/lib.linux-armv7l-2.7/lxml/includes copying src/lxml/includes/xinclude.pxd -> build/lib.linux-armv7l-2.7/lxml/includes copying src/lxml/includes/dtdvalid.pxd -> build/lib.linux-armv7l-2.7/lxml/includes copying src/lxml/includes/xmlerror.pxd -> build/lib.linux-armv7l-2.7/lxml/includes copying src/lxml/includes/config.pxd -> build/lib.linux-armv7l-2.7/lxml/includes copying src/lxml/includes/tree.pxd -> build/lib.linux-armv7l-2.7/lxml/includes copying src/lxml/includes/xmlschema.pxd -> build/lib.linux-armv7l-2.7/lxml/includes copying src/lxml/includes/etreepublic.pxd -> build/lib.linux-armv7l-2.7/lxml/includes copying src/lxml/includes/xmlparser.pxd -> build/lib.linux-armv7l-2.7/lxml/includes copying src/lxml/includes/htmlparser.pxd -> build/lib.linux-armv7l-2.7/lxml/includes copying src/lxml/includes/lxml-version.h -> build/lib.linux-armv7l-2.7/lxml/includes copying src/lxml/includes/etree_defs.h -> build/lib.linux-armv7l-2.7/lxml/includes creating build/lib.linux-armv7l-2.7/lxml/isoschematron/resources creating build/lib.linux-armv7l-2.7/lxml/isoschematron/resources/rng copying src/lxml/isoschematron/resources/rng/iso-schematron.rng -> build/lib.linux-armv7l-2.7/lxml/isoschematron/resources/rng creating build/lib.linux-armv7l-2.7/lxml/isoschematron/resources/xsl copying src/lxml/isoschematron/resources/xsl/XSD2Schtrn.xsl -> build/lib.linux-armv7l-2.7/lxml/isoschematron/resources/xsl copying src/lxml/isoschematron/resources/xsl/RNG2Schtrn.xsl -> build/lib.linux-armv7l-2.7/lxml/isoschematron/resources/xsl creating build/lib.linux-armv7l-2.7/lxml/isoschematron/resources/xsl/iso-schematron-xslt1 copying src/lxml/isoschematron/resources/xsl/iso-schematron-xslt1/iso_dsdl_include.xsl -> build/lib.linux-armv7l-2.7/lxml/isoschematron/resources/xsl/iso-schematron-xslt1 copying src/lxml/isoschematron/resources/xsl/iso-schematron-xslt1/iso_svrl_for_xslt1.xsl -> build/lib.linux-armv7l-2.7/lxml/isoschematron/resources/xsl/iso-schematron-xslt1 copying src/lxml/isoschematron/resources/xsl/iso-schematron-xslt1/iso_schematron_skeleton_for_xslt1.xsl -> build/lib.linux-armv7l-2.7/lxml/isoschematron/resources/xsl/iso-schematron-xslt1 copying src/lxml/isoschematron/resources/xsl/iso-schematron-xslt1/iso_schematron_message.xsl -> build/lib.linux-armv7l-2.7/lxml/isoschematron/resources/xsl/iso-schematron-xslt1 copying src/lxml/isoschematron/resources/xsl/iso-schematron-xslt1/iso_abstract_expand.xsl -> build/lib.linux-armv7l-2.7/lxml/isoschematron/resources/xsl/iso-schematron-xslt1 copying src/lxml/isoschematron/resources/xsl/iso-schematron-xslt1/readme.txt -> build/lib.linux-armv7l-2.7/lxml/isoschematron/resources/xsl/iso-schematron-xslt1 running build_ext building 'lxml.etree' extension creating build/temp.linux-armv7l-2.7 creating build/temp.linux-armv7l-2.7/src creating build/temp.linux-armv7l-2.7/src/lxml arm-linux-gnueabihf-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fno-strict-aliasing -Wdate-time -D_FORTIFY_SOURCE=2 -g -fstack-protector-strong -Wformat -Werror=format-security -fPIC -DCYTHON_CLINE_IN_TRACEBACK=1 -I/usr/include/libxml2 -Isrc -Isrc/lxml/includes -I/usr/include/python2.7 -c src/lxml/etree.c -o build/temp.linux-armv7l-2.7/src/lxml/etree.o -w arm-linux-gnueabihf-gcc -pthread -shared -Wl,-O1 -Wl,-Bsymbolic-functions -Wl,-Bsymbolic-functions -Wl,-z,relro -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -Wdate-time -D_FORTIFY_SOURCE=2 -g -fstack-protector-strong -Wformat -Werror=format-security -Wl,-Bsymbolic-functions -Wl,-z,relro -Wdate-time -D_FORTIFY_SOURCE=2 -g -fstack-protector-strong -Wformat -Werror=format-security build/temp.linux-armv7l-2.7/src/lxml/etree.o -lxslt -lexslt -lxml2 -lrt -lz -lm -o build/lib.linux-armv7l-2.7/lxml/etree.so /usr/bin/ld: cannot find -lz collect2: error: ld returned 1 exit status error: command 'arm-linux-gnueabihf-gcc' failed with exit status 1
Command "/usr/bin/python -u -c "import setuptools, tokenize;file='/tmp/pip-build-1jQTmj/lxml/setup.py';f=getattr(tokenize, 'open', open)(file);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, file, 'exec'))" install --record /tmp/pip-Z535dk-record/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /tmp/pip-build-1jQTmj/lxml/