This is probably a bug in X11::GUITest.

I can reproduce that on my setup. Here's some valgrind output that might help locate the bug.

==12233== Memcheck, a memory error detector for x86-linux.
==12233== Copyright (C) 2002-2005, and GNU GPL'd, by Julian Seward et 
+al.
==12233== Using valgrind-2.4.0, a program supervision framework for x8
+6-linux.
==12233== Copyright (C) 2000-2005, and GNU GPL'd, by Julian Seward et 
+al.
==12233== For more details, rerun with: -v
==12233== 
==12233== Invalid read of size 4
==12233==    at 0x1B90C723: XS_X11__GUITest_GetRootWindow (in /usr/loc
+al/lib/perl5/site_perl/5.8.6/i686-linux/auto/X11/GUITest/GUITest.so)
==12233==    by 0x80D152C: Perl_pp_entersub (pp_hot.c:2890)
==12233==    by 0x80B3991: Perl_runops_debug (dump.c:1449)
==12233==    by 0x806332C: S_call_body (perl.c:2298)
==12233==    by 0x8062F97: Perl_call_sv (perl.c:2216)
==12233==    by 0x80672DB: S_call_list_body (perl.c:4732)
==12233==    by 0x8066F1B: Perl_call_list (perl.c:4661)
==12233==    by 0x8095EE6: Perl_newATTRSUB (op.c:4472)
==12233==    by 0x80920F8: Perl_utilize (op.c:3048)
==12233==    by 0x8089B5F: Perl_yyparse (perly.y:414)
==12233==    by 0x8061F70: S_parse_body (perl.c:1778)
==12233==    by 0x80610F1: perl_parse (perl.c:1282)
==12233==  Address 0x8C is not stack'd, malloc'd or (recently) free'd
==12233== 
==12233== Process terminating with default action of signal 11 (SIGSEG
+V)
==12233==  Access not within mapped region at address 0x8C
==12233==    at 0x1B90C723: XS_X11__GUITest_GetRootWindow (in /usr/loc
+al/lib/perl5/site_perl/5.8.6/i686-linux/auto/X11/GUITest/GUITest.so)
==12233==    by 0x80D152C: Perl_pp_entersub (pp_hot.c:2890)
==12233==    by 0x80B3991: Perl_runops_debug (dump.c:1449)
==12233==    by 0x806332C: S_call_body (perl.c:2298)
==12233==    by 0x8062F97: Perl_call_sv (perl.c:2216)
==12233==    by 0x80672DB: S_call_list_body (perl.c:4732)
==12233==    by 0x8066F1B: Perl_call_list (perl.c:4661)
==12233==    by 0x8095EE6: Perl_newATTRSUB (op.c:4472)
==12233==    by 0x80920F8: Perl_utilize (op.c:3048)
==12233==    by 0x8089B5F: Perl_yyparse (perly.y:414)
==12233==    by 0x8061F70: S_parse_body (perl.c:1778)
==12233==    by 0x80610F1: perl_parse (perl.c:1282)
==12233== 
==12233== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 29 from
+ 1)
==12233== malloc/free: in use at exit: 569628 bytes in 11354 blocks.
==12233== malloc/free: 20629 allocs, 9275 frees, 12754505 bytes alloca
+ted.
==12233== For counts of detected errors, rerun with: -v
==12233== searching for pointers to 11354 not-freed blocks.
==12233== checked 901964 bytes.
==12233== 
==12233== LEAK SUMMARY:
==12233==    definitely lost: 0 bytes in 0 blocks.
==12233==      possibly lost: 152 bytes in 1 blocks.
==12233==    still reachable: 569476 bytes in 11353 blocks.
==12233==         suppressed: 0 bytes in 0 blocks.
==12233== Reachable blocks (those to which a pointer was found) are no
+t shown.
==12233== To see them, rerun with: --show-reachable=yes
Segmentation fault
[download]

You can report the bug at the cpan bugtracker for X11::GUITest.

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