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when I activate virtualenv and type 'pip install lxml' installation process crashes with message:

/usr/bin/ld: cannot find -lz

collect2: error: ld returned 1 exit status

error: command 'x86_64-linux-gnu-gcc' failed with exit status 1
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  • There is a some required packages missing problem. Please install this packages to your system.I'm using centos and i have install it using yum command. libxml2 libxml2-devel libxslt libxslt-devel Commented Oct 23, 2019 at 9:43

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The error you have to pay attention to is the first "/usr/bin/ld: cannot find -lz": tnhat means you don't have zlib-dev installed. Depending on your linux distribution it could be named zlib-dev or zlib1g-dev in Ubuntu, I don't know in other distros.

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Installing those dependencies fixed it for me (Debian 7):

sudo apt-get install libxml2-dev libxslt1-dev

source: src/lxml/etree_defs.h:9:31: fatal error: libxml/xmlversion.h: No such file or directory

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From https://askubuntu.com/questions/627140/cannot-install-lxml-on-ubuntu-14

sudo apt-get install -y libxml2-dev libxslt1-dev zlib1g-dev python3-pip
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For RHEL7/Fedora/CentOS in order to install lxml you need to:

YUM/DNF install libxml2 libxslt

...and possibly:

YUM/DNF install libxslt-devel libxml2-devel

Cheers!

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