http://stackoverflow.com/questions/2197918/cross-platform-way-of-testing-whether-a-file-is-a-directory

error: structure has no member named `d_type'
error: `DT_DIR' undeclared (first use in this function)

# error: 'struct msghdr' has no member named 'msg_control'
-D_XPG4_2

# error: 'TIOCGWINSZ' was not declared in this scope
#include <termios.h>

How to run an old binary file

If a process uses localtime or similar time functions which use "struct tm", you sould set an environment variable OLDER_COMPAT wich some value (the value does not matter).

Example of Communigate Pro:

server# OLDER_COMPAT=yes /opt/CommuniGate/CGServer --Base /var/CommuniGate --Daemon

We have two extended fields in this structure. The variable forces ignoring them.