since 11.10 shared libraries must be placed after the objects needing their 
symbols (as it was always the case with static libraries)
this due to the linker flag --as-needed being default now

this works:
gcc pthread_test.c -lpthread -o test

and so does this:
gcc -pthread pthread_test.c -o test

** Changed in: gcc-defaults (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1001618

Title:
  gcc link step fails against -lpthread and -ldl

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