extend configure error message to suggest package to install (epoll/xattr)

[Pavel Tisnovsky]

Hi Mark,

this patch seems to be very useful, thank you.

I'm ok with them ;-)

Pavel

Mark Wielaard wrote:
> Hi,
> 
> Currently configure tests for epoll and xattr support, but then gives a
> very generic error message:
> 
>         configure: error: Could not find required system headers;
>         install the appropriate files or use
>         --disable-compile-against-syscalls if necessary.
> 
> This patch makes the error message a bit more verbose with hints to the
> packages to install like with some of the other checks:
> 
>         configure: error: Could not find required system headers;
>         install the appropriate files from glibc-headers, libc6-dev
>         and/or libattr-devel, libattr1-dev or use
>         --disable-compile-against-syscalls if necessary.
> 
> Patch OK for icedtea7?
> 
> 2011-09-27  Mark Wielaard  <mark at klomp.org>
> 
>         * acinclude.m4: Add devel package suggestions for epoll/xattr 
>         check failure.
> 
> Thanks,
> 
> Mark
> 
> P.S. I have also install libattr1-dev on the x86_64 buildslave so it
> should start building again:
> http://builder.classpath.org/icedtea/buildbot/builders/icedtea7-squeeze-x86_64-quick/
>