Bug#700470: libmouse-perl: lack of error handling in the build can lead to broken packages.

[peter green]

Package: libmouse-perl
Version: 0.99-1
Severity: normal

http://snapshot.raspbian.org/201302121719/raspbian/logs/main/libm/libmouse-perl.log

   dh_auto_configure -a
Mouse configured with XS.
This distribution requires a C compiler, but it's not available, stopped.
   dh_auto_build -a
<--snip-->
   dh_builddeb -a
dpkg-deb: building package `libmouse-perl' in
`../libmouse-perl_0.99-1_armhf.deb'.

The reason it failed to find the compiler was raspbian specific and has
now been dealt with. However when packages need something to build and
don't find it they should fail to build with an error, not carry on
regardless and build a broken package.