Search for icons and such in /usr/share/slic3r.

diff -ru a/lib/Slic3r.pm c/lib/Slic3r.pm
--- a/lib/Slic3r.pm	2013-01-17 15:50:45.000000000 +0100
+++ c/lib/Slic3r.pm	2013-01-22 00:15:56.797243399 +0100
@@ -24,8 +24,7 @@
 warn "Running Slic3r under Perl >= 5.16 is not supported nor recommended\n"
     if $^V >= v5.16;
 
-use FindBin;
-our $var = "$FindBin::Bin/var";
+our $var = "/usr/share/slic3r";
 
 use Encode;
 use Encode::Locale;