[perfmon2] Compile error

[Asma D. <asm...@ya...>]

Hello, 

I try to compile perf-examples in libpfm4.6 with the GCC compiler in Linux 3.5.0-23-generic, But i've got this error message:
asma@asma-Inspiron-N4050:~/Bureau/PMM/libpfm-4.6.0/perf_examples$ gcc  -fopenmp self.c 
/tmp/ccCwfEbh.o: In function `main':
self.c:(.text+0x3d1): undefined reference to `pfm_initialize'
self.c:(.text+0x3e4): undefined reference to `pfm_strerror'
self.c:(.text+0x423): undefined reference to `perf_setup_argv_events'
self.c:(.text+0x670): undefined reference to `perf_free_fds'
self.c:(.text+0x675): undefined reference to `pfm_terminate'
collect2: ld a retourné 1 code d'état d'exécution

Can you please tell me what to do?
Thank you.