Build OS: CentOS 6.5
GCC version: 4.4.7

Compilation of s2n fails with following error:
-- 8< --
s2n_connection.c: In function ‘s2n_connection_wipe’:
s2n_connection.c:195: error: #pragma GCC diagnostic not allowed inside functions
s2n_connection.c:196: error: #pragma GCC diagnostic not allowed inside functions
s2n_connection.c:204: error: #pragma GCC diagnostic not allowed inside functions
make[1]: *** [s2n_connection.o] Error 1
make[1]: Leaving directory `/home/schinnas/work/src/s2n/tls'
make: *** [libs] Error 2
-- 8< --

I am not sure whether it's harmless to remove the #pragma lines and compile. However, it would be good to support older gcc compilers.

Please let me know if I am missing something.