The following bug has been logged on the website:

Bug reference:      6759
Logged by:          jez wain
Email address:      jez.w...@bull.net
PostgreSQL version: 9.1.4
Operating system:   AIX 7.1
Description:        

The configure script (near line 3247) detects the compiler version with 

--version,  -v, and -V

IBM's xlc compiler uses "-qversion" flag to display its version.

This produces:
bash-4.2$ xlc -qversion
IBM XL C/C++ for AIX, V11.1 (5724-X13)
Version: 11.01.0000.0000

If you require additional information, there is a verbose switch,
-qversion=verbose, which produces: 

bash-4.2$ xlc -qversion=verbose
IBM XL C/C++ for AIX, V11.1 (5724-X13)
Version: 11.01.0000.0000
Driver Version: 11.01(C/C++) Level: 100304
C Front End Version: 11.00(C/C++) Level: 100301
High-Level Optimizer Version: 11.01(C/C++) and 13.01(Fortran) Level: 100301
Low-Level Optimizer Version: 11.01(C/C++) and 13.01(Fortran) Level: 100304
bash-4.2$ 



When faced with a flag it doesn't recognize, xlc prints the man page. Thus
the --version, -v, -V tests result in a particularly large config.log file


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