[NSWI004] compiling the program from the quiz

[Pavel Vigilev]

Hi there. Do anyone have a problem with compiling the program from the
`before`-quiz? gcc on my machine and rotunda's machine complains:

$ gcc main.c/usr/bin/ld: /tmp/ccwFEzMI.o: in function `main':
main.c:(.text+0x84): undefined reference to `pthread_create'
/usr/bin/ld: main.c:(.text+0xb6): undefined reference to `pthread_create'
/usr/bin/ld: main.c:(.text+0xc7): undefined reference to `pthread_join'
/usr/bin/ld: main.c:(.text+0xd8): undefined reference to `pthread_join'
collect2: error: ld returned 1 exit status

What is possible to do about it?

Regards
Pavel Vigilev
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