error: array type has incomplete element type ??

[onkar dot mahajan at polaris dot co dot in]

This is a part of the code :
--------------------------------------------------------------
extern struct dummy temp[];
error: array type has incomplete element type
--------------------------------------------------------------

 which i  compiled without any error on :

$gcc -v
Reading specs from /usr/bin/../lib/gcc-lib/powerpc-ibm-aix5.1.0.0
/2.9-aix51-020209/specs
gcc version 2.9-aix51-020209

but the same code doesnt compile on the :
$gcc -v
Using built-in specs.
Target: powerpc-ibm-aix5.3.0.0
Configured with: ../configure --with-as=/usr/bin/as --with-ld=/usr/bin/ld
--disable-nls --enable-languages=c,c++ --prefix=/opt/freeware
--enable-threads --enable-version-specific-runtime-libs
--host=powerpc-ibm-aix5.3.0.0
Thread model: aix
gcc version 4.0.0

please suggest me the arguments I must give to gcc 4.0 to get the above
code compiled.



Onkar


PS :


I have already gone through the article :
<http://www.open-std.org/jtc1/sc22/wg14/www/docs/dr_047.html>.

the code I am compiling is  large and it is difficult to change it now.
Please suggest me something that GCC 4.0 has for backward compatibility.






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