while compiling thread program on linux machine it gives "undefined reference " error

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http://stackoverflow.com – Hi I have written a simple program in threads to create 10 threads and execute them normally but when I compile the code on linux machine it gives following errors.. */tmp/cc4swqyK.o: In function main': threadcreate1.c:(.text+0x40): undefined reference topthread_create' threadcreate1.c:(.text+0x78): undefined reference to `pthread_join' collect2: ld returned 1 exit status* (HowTos)