Newbie here, trying to get pre and post observations script to turn on/off lna. I have followed the wiki on installing rtl_biast. I can manually turn the lna on and off but only from within the home/pi/rtl_biast/build/src directory by typing ./rtl_biast -b 1 (or 0). If I try from any other directory using /home/pi/rtl_biast/build/src/rtl_biast -b 1, I get an error that says “/home/pi/rtl_biast/build/src/rtl_biast: symbol lookup error: /home/pi/rtl_biast/build/src/rtl_biast: undefined symbol: rtlsdr_set_gpio” I have tried manually setting the gpio to 0 in the command with no luck. Without this working, I cannot set up pre and post observations scripts to turn the lna on/off. Appreciate any help.
I’d try a
sudo make install
from that build directory to get the binaries/libraries/includes installed properly in /usr/local.
Then go from there.
Thanks for the reply. I tried your suggestion, but just get errors. Something must be wrong with how I installed rtl_biast, but I followed the wiki exactly. The rtl_biast is in the /home/pi directory. Is that correct? Really frustrated as everything will be done once I get the pre/post observation scripts working.
Yes, that is correct.
Looks like make is trying to ‘cd’ into a non-existent directory (/rtl_biast/build instead of /home/pi/rtl_biast/build).
I would start over and reinstall rtl_biast and see if that resolves the issue
As the default user (not su or root) remove the rtl_biast directory with
cd ~
rm -rf ~/rtl_biast
then install from scratch
git clone https://github.com/rtlsdrblog/rtl_biast
cd rtl_biast
mkdir build
cd build
cmake ..
make
sudo make install
Scott (MAUSyagi)
Thank you! 
Had to delete the directory with sudo, but now everything is working as it should. I think whoever installed the rtl_biast (a student) maybe wasn’t logged in correctly. Thanks again, AV (RHOK-SAT)
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