Description of problem:
The test cases tst-aiod2.c and tst-aiod3.c fail to build:

tst-aiod3.c: In function 'thrfct':
tst-aiod3.c:35:3: warning: implicit declaration of function 'pthread_barrier_wait' [-Wimplicit-function-declaration]
   int e = pthread_barrier_wait (&b);
   ^
tst-aiod3.c:36:22: error: 'PTHREAD_BARRIER_SERIAL_THREAD' undeclared (first use in this function)
   if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
                      ^
tst-aiod3.c:36:22: note: each undeclared identifier is reported only once for each function it appears in
tst-aiod3.c: In function 'do_test':
tst-aiod3.c:62:3: warning: implicit declaration of function 'pthread_barrier_init' [-Wimplicit-function-declaration]
   if (pthread_barrier_init (&b, NULL, 2) != 0)
   ^
tst-aiod3.c:120:22: error: 'PTHREAD_BARRIER_SERIAL_THREAD' undeclared (first use in this function)
   if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
                      ^

tst-aiod2.c: In function 'thrfct':
tst-aiod2.c:36:3: warning: implicit declaration of function 'pthread_barrier_wait' [-Wimplicit-function-declaration]
   int e = pthread_barrier_wait (&b);
   ^
tst-aiod2.c:37:22: error: 'PTHREAD_BARRIER_SERIAL_THREAD' undeclared (first use in this function)
   if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
                      ^
tst-aiod2.c:37:22: note: each undeclared identifier is reported only once for each function it appears in
tst-aiod2.c: In function 'do_test':
tst-aiod2.c:63:3: warning: implicit declaration of function 'pthread_barrier_init' [-Wimplicit-function-declaration]
   if (pthread_barrier_init (&b, NULL, 2) != 0)
   ^
tst-aiod2.c:117:22: error: 'PTHREAD_BARRIER_SERIAL_THREAD' undeclared (first use in this function)
   if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
                      ^

Version-Release number of selected component (if applicable):
glibc-2.17.90-1.fc20

How reproducible:
Always.

Steps to Reproduce:
See Build log.

Additional info:
The tests fail to include pthread.h.