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MessageBox Error


Hi all
I thought i follow all instructions when i installed
cygwin. After this error i realized i missed something
and i can't find what.
When i do gcc file.c -o file.exe i receive this
errors:
...
C:WINDOWS\TEMP\cc3RUm9j.o(.text+0x770d):c.c: undefined
reference to `MessageBoxA@16'
C:\WINDOWS\TEMP\cc3RUm9j.o(.text+0x8f2a):c.c: more
undefined references to `MessageBoxA@16' follow
collect2: ld returned 1 exit status

This error only occurs when i add a line #define WIN32
in the file.c. I i don't, cygwin works fine and the
executable runs ok. The reason i need the #define
win32 is because it adds some functions to the
program.

Looks like 
i need to link with windows library. I don't know how
to do it. Please someone kindly help me on this?!
Best regards


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