Accessing value of lineEdit in .cpp file- [SOLVED]
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It's not enough to simply include the <alsa/asoundlib.h> header in your code. You also have to tell the linker that you want to use the asound library. Use the LIBS variable in your .pro file to do so. I don't know for sure what the proper library name to use is (off the top of my head.) Probably want to use -Lasound or something like that.
There are a number of threads that discuss how to include libraries.