bug in AC_FUNC_FSEEKO

[James Andrewartha]

I'm compiling gstreamer on an Alpha running Linux, and I get the following 
error: 
http://jhbuild.bxlug.be/builds/2006-12-20-0008/logs/gstreamer/#build

Tracing it back, the problem comes from AC_FUNC_FSEEKO - the config.log 
for the above build contains:

configure:26528: checking for _LARGEFILE_SOURCE value needed for large files
configure:26555: gcc -o conftest -O2 -Wall -Wno-unknown-pragmas 
-Wno-strict-aliasing -Wno-format -Wno-cast-align   conftest.c  >&5
conftest.c: In function 'main':
conftest.c:44: warning: implicit declaration of function 'fseeko'
configure:26561: $? = 0
configure:26625: result: no

stdio.h contains

#if defined __USE_LARGEFILE || defined __USE_XOPEN2K
# ifndef __USE_FILE_OFFSET64

before the definition of fseeko.

_USE_LARGFEILE doesn't need to be #defined on Alpha, which is why 
ac_cv_sys_largefile_source is set to no. The check

if test $ac_cv_sys_largefile_source != unknown; then
   AC_DEFINE(HAVE_FSEEKO, 1,
     [Define to 1 if fseeko (and presumably ftello) exists and is 
declared.])
fi
])# AC_FUNC_FSEEKO

then incorrectly causes HAVE_FSEEKO to be defined. I'm using autoconf 
2.61 on Debian etch.

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