Torsocks not builds on old kernels where epoll_pwait isn't implemented

When I tried to compile Torsocks v2.2.0 on an embedded device (with Linux 2.6.31.8 kernel), it gave me this error:

  CC       test_socks5.o
  CCLD     test_socks5
../../src/lib/.libs/libtorsocks.so: undefined reference to `epoll_pwait'
collect2: error: ld returned 1 exit status
Makefile:606: recipe for target 'test_socks5' failed
make[2]: *** [test_socks5] Error 1

Because the epoll_pwait and the epoll system call has been implemented in the 2.6.32 AFAIK.

Trac:
Username: Mr Dini