AIX compilation problem

[Saravanan Bellan]

I was trying to compile ncurses 5.3 with the widec option on AIX 4.3. After
a lot of trial and error, I got it compiled after setting the the following
variables,

$ ./configure CFLAGS="-D_XOPEN_SOURCE=500 -D_ALL_SOURCE" --enable-widec

_XOPEN_SOURCE used in wchar.h
_ALL_SOURCE in sys/ioctl.h


Can anyone explain what those variables mean?

Thanks,




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