Linking portaudio into a C program on Linux - c

Question

Problem with linking portaudio into an c program on Linux.
System: Linux Ubuntu 20.4 i5 16 GB
ALSA and pulseaudio were preinstralled.
gcc (Ubuntu 9.3.0-17ubuntu1~20.04) 9.3.0
gcc -Wall wm_1.c -lm libportaudio.a -o wm_1
The linker gives me more than 100 error messages all of type "undefined reference"
Here 2 examples out of >100
/home/max/Desktop/dev/portaudio/src/hostapi/alsa/pa_linux_alsa.c:504: undefined reference to snd_pcm_status_get_delay' /home/max/Desktop/dev/portaudio/src/hostapi/oss/pa_unix_oss.c:1778: undefined reference to __pthread_unregister_cancel'
So its obvious that the named parameter/function can not be found.
The error messages all point to source files in the source directory (the directory of the portaudio
package I downloaded to creatie the libs which were all created without error.
The libs are in /usr/local/..
libportaudio.a libportaudio.la libportaudio.so libportaudio.so.2 libportaudio.so.2.0.0 pkgconfig python3.8
and I copied libportaudio.a into the project directory. The lib has a a size of 1.1 MB .
if I use the dynamic libportaudio.so I get the error messages at run time.
I suspect that something went totally wrong with creating the libraries but I have no idea how to solve that
Other option:
Linking parameter or files missing ?
Header file ?
The same program compiles, links and runs without any problem on a iMac OS 10.13.6
where I used the dynamic lib .dylib.
gcc -v wm_1.c libportaudio.dylib -o wm_1

Answer 1

From the documentation:
Note that you will usually need to link with the approriate libraries that you used, such as ALSA and JACK, as well as with librt and libpthread. For example:
gcc main.c libportaudio.a -lrt -lm -lasound -ljack -pthread -o YOUR_BINARY
A little googling goes a long way...

Answer 2

This works:
gcc -Wall wm_1.c -lm libportaudio.a -lasound -pthread -o test.
gcc main.c libportaudio.a -lrt -lm -lasound -ljack -pthread -o YOUR_BINARY
I used that page and the command line at the begin using all 3 parameter but got errors, probably of misspelling, so I gave up on that (also because on the Mac OS it was not necessary). It now links without errors using -lasound and -pthread only (-pthread alone gives still errors and the use/not use of -ljack makes no difference).
I get some errors when I run the program but probably because of missing or wrong ALSA parameter settings. I found -pthread but I could not find -ljack and -lasound.
So the question: what are this 2 parameter doing?
It must be link parameter, but where is the documentation, I searched ld and gcc and did not find anything, while -pthread is documented.