Can't use SLSK due to repeated crashes (bug report incl.)

Every time I search the application crashes within ~10 sec.

Running on 5 yr old IMAC, OSX 10.5.8.

Problem Report:

Process: SoulseekQt [29500]
Path: /Applications/SoulseekQt.app/Contents/MacOS/SoulseekQt
Identifier: com.yourcompany.SoulseekQt
Version: ??? (???)
Code Type: X86 (Native)
Parent Process: launchd [26546]

Interval Since Last Report: 118644 sec
Crashes Since Last Report: 5
Per-App Interval Since Last Report: 810 sec
Per-App Crashes Since Last Report: 5

Date/Time: 2013-03-22 10:08:29.023 -0400
OS Version: Mac OS X 10.5.8 (9L31a)
Report Version: 6
Anonymous UUID: 127DE111-7114-43C4-8D8B-6A8805AC8483

Exception Type: EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000002, 0x0000000000000000
Crashed Thread: 0

Dyld Error Message:
Symbol not found: __ZSt16__ostream_insertIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_PKS3_i
Referenced from: /Applications/SoulseekQt.app/Contents/MacOS/SoulseekQt
Expected in: /usr/lib/libstdc++.6.dylib

--THANKS!

As stated on the download page, SoulseekQt requires Snow Leopard or newer.