I then try compiling the version 2.7.3, different errors were shown while 'make'

  ./Modules/posixmodule.c:6151:5: warning: implicit declaration of function 'wait'[-Wimplicit-function-declaration]
  ./Modules/posixmodule.c: In function 'posix_fdopen':
  ./Modules/posixmodule.c:6751:9: warning: implicit declaration of function 'fcntl' [-Wimplicit-function-declaration]
  ./Modules/posixmodule.c:6751:27: error: 'F_GETFL' undeclared (first use in this function)
  ./Modules/posixmodule.c:6751:27: note: each undeclared identifier is reported only once for each function it appears in
  ./Modules/posixmodule.c:6753:23: error: 'F_SETFL' undeclared (first use in this function)
  ./Modules/posixmodule.c: In function 'posix_pipe':
  ./Modules/posixmodule.c:6816:5: warning: implicit declaration of function 'pipe' [-Wimplicit-function-declaration]
  ./Modules/posixmodule.c: At top level:
  ./Modules/posixmodule.c:671:1: warning: 'posix_fildes' defined but not used [-Wunused-function]
  ./Modules/posixmodule.c:7480:1: warning: 'conv_confname' defined but not used [-Wunused-function]
  ./Modules/posixmodule.c:8387:1: warning: 'setup_confname_table' defined but not used [-Wunused-function]
  make: *** [Modules/posixmodule.o] Error 1