This might be an easily answerable question, but it's really got me stumped. I'm redownloading pyindi-client following www.indilib.org/develop/indi-python-bindings.html. At
--> pip3 install --user --install-option="--prefix=" pyindi-client

I get an error:
arm-linux-genueabihf-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -g -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -fPIC -I/usr/include -I/usr/include/libindi -I/usr/include/python3.5m -c indiclientpython_wrap.cpp -o build/temp.linux-armv7l-3.5/indiclientpython_wrap.o -std=c++11

cc1plus: warning: command line option '-Wstrict-prototypes' is valid for C/ObjC but not for C++

creating build/lib.linux-armv7l-3.5

arm-linux-gnueabihf-g++ -pthread -shared -Wl,-O1 -Wl,-Bsymbolic-functions -Wl,-Bsymbolic-functions -Wl,-z,relro -Wl,-Bsymbolic-functions -Wl,-s,relro -g -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 build/temp.linux-armv7l-3.5/indiclientpython_wrap.o /usr/lib/libindiclient.a -lz -lcfitsio -lnova -o build/lib.linux-armv7l-3.5/_PyIndi.cpython-35m-arm-linux-gnueabihf.so

/usr/bin/ld: cannot find -lz

collect2: error: ld returned 1 exit status

error: command 'arm-linux-gnueabihf-g++' failed with exit status 1

I'm not sure what's going on, because last time I went through the process it went without a hitch.

I figured it out. It was a permissions issue that I solved by running:
sudo chmod 777 /home/user/.cache/pip
and
sudo chmod 777 /home/user/.cache/pip/*
I'm not sure why this was causing the issue, especially since I also tried downloading pyindi-client from pypi.org/project/pyindi-client/#description where I don't remember using pip and it was also causing the same issue. Again, probably something really stupid, but I guess atleast it's working now.

Rendering Error in layout Message/Item: array_keys(): Argument #1 ($array) must be of type array, null given. Please enable debug mode for more information.

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