C: Undefined symbols for architecture x86_64 [closed]

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I call the function phtread_kill(gpsNavigationThread, 0) and ge the following error

Undefined symbols for architecture x86_64:

"_phtread_kill", referenced from:
  _startgpswatchdog in ccXXNhjy.o
ld: symbol(s) not found for architecture x86_64

I #include <pthread.h> so am not sure what the issue is.

I link as follows

gcc gps_nav.c dijk.c serial.c parser.c nav_corelogic.c -I/usr/include/libxml2 -lxml2 -lm -lpthread -o logic

I also #include signal.h but am not sure if there is a library for linking with it.

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It's

pthread_kill(gpsNavigationThread, 0)

not:

phtread_kill(gpsNavigationThread, 0)

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Have you linked with the pthreads library: -lpthread

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Did you compile with -lpthread ?

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Try the -pthread option, which should set the appropriate options for both compilation and linking.