I installed the libstdc++.so.5 from http://packages.debian.org/lenny/amd64/libstdc++5/download but it did not help.
Now hdspmixer crashes on startup.

tero@napalmi:~$ hdspmixer

HDSPMixer 1.6 - Copyright (C) 2003 Thomas Charbonnel <email address hidden>
This program comes with ABSOLUTELY NO WARRANTY
HDSPMixer is free software, see the file COPYING for details

Looking for HDSP cards :
*** glibc detected *** hdspmixer: free(): invalid pointer: 0x00007f12c7e24c74 ***
======= Backtrace: =========
/lib/libc.so.6[0x7f12c7571dd6]
/lib/libc.so.6(cfree+0x6c)[0x7f12c757670c]
hdspmixer[0x403b12]
/lib/libc.so.6(__libc_start_main+0xfd)[0x7f12c751aabd]
hdspmixer[0x4038e9]
======= Memory map: ========
00400000-0044b000 r-xp 00000000 09:00 290557                             /usr/bin/hdspmixer
0064a000-0064b000 r--p 0004a000 09:00 290557                             /usr/bin/hdspmixer
0064b000-0065c000 rw-p 0004b000 09:00 290557                             /usr/bin/hdspmixer
0138c000-013ad000 rw-p 0138c000 00:00 0                                  [heap]
7f12c0000000-7f12c0021000 rw-p 7f12c0000000 00:00 0 
7f12c0021000-7f12c4000000 ---p 7f12c0021000 00:00 0 
7f12c5870000-7f12c5875000 r-xp 00000000 09:00 231901                     /usr/lib/libXdmcp.so.6.0.0
7f12c5875000-7f12c5a74000 ---p 00005000 09:00 231901                     /usr/lib/libXdmcp.so.6.0.0
7f12c5a74000-7f12c5a75000 rw-p 00004000 09:00 231901                     /usr/lib/libXdmcp.so.6.0.0
7f12c5a75000-7f12c5a77000 r-xp 00000000 09:00 229090                     /usr/lib/libXau.so.6.0.0
7f12c5a77000-7f12c5c76000 ---p 00002000 09:00 229090                     /usr/lib/libXau.so.6.0.0
7f12c5c76000-7f12c5c77000 r--p 00001000 09:00 229090                     /usr/lib/libXau.so.6.0.0
7f12c5c77000-7f12c5c78000 rw-p 00002000 09:00 229090                     /usr/lib/libXau.so.6.0.0
7f12c5c78000-7f12c5c93000 r-xp 00000000 09:00 235287                     /usr/lib/libxcb.so.1.1.0
7f12c5c93000-7f12c5e92000 ---p 0001b000 09:00 235287                     /usr/lib/libxcb.so.1.1.0
7f12c5e92000-7f12c5e93000 r--p 0001a000 09:00 235287                     /usr/lib/libxcb.so.1.1.0
7f12c5e93000-7f12c5e94000 rw-p 0001b000 09:00 235287                     /usr/lib/libxcb.so.1.1.0
7f12c5e94000-7f12c5ea5000 r-xp 00000000 09:00 2199                       /usr/lib/libXext.so.6.4.0
7f12c5ea5000-7f12c60a4000 ---p 00011000 09:00 2199                       /usr/lib/libXext.so.6.4.0
7f12c60a4000-7f12c60a5000 r--p 00010000 09:00 2199                       /usr/lib/libXext.so.6.4.0
7f12c60a5000-7f12c60a6000 rw-p 00011000 09:00 2199                       /usr/lib/libXext.so.6.4.0
7f12c60a6000-7f12c60cc000 r-xp 00000000 09:00 5849                       /lib/libexpat.so.1.5.2
7f12c60cc000-7f12c62cc000 ---p 00026000 09:00 5849                       /lib/libexpat.so.1.5.2
7f12c62cc000-7f12c62ce000 r--p 00026000 09:00 5849                       /lib/libexpat.so.1.5.2
7f12c62ce000-7f12c62cf000 rw-p 00028000 09:00 5849                       /lib/libexpat.so.1.5.2
7f12c62cf000-7f12c62d8000 r-xp 00000000 09:00 232054                     /usr/lib/libXrender.so.1.3.0
7f12c62d8000-7f12c64d7000 ---p 00009000 09:00 232054                     /usr/lib/libXrender.so.1.3.0
7f12c64d7000-7f12c64d8000 r--p 00008000 09:00 232054                     /usr/lib/libXrender.so.1.3.0
7f12c64d8000-7f12c64d9000 rw-p 00009000 09:00 232054                     /usr/lib/libXrender.so.1.3.0
7f12c64d9000-7f12c64ef000 r-xp 00000000 09:00 258533                     /lib/libz.so.1.2.3.3
7f12c64ef000-7f12c66ee000 ---p 00016000 09:00 258533                     /lib/libz.so.1.2.3.3
7f12c66ee000-7f12c66ef000 r--p 00015000 09:00 258533                     /lib/libz.so.1.2.3.3
7f12c66ef000-7f12c66f0000 rw-p 00016000 09:00 258533                     /lib/libz.so.1.2.3.3
7f12c66f0000-7f12c676f000 r-xp 00000000 09:00 229047                     /usr/lib/libfreetype.so.6.3.20
7f12c676f000-7f12c696f000 ---p 0007f000 09:00 229047                     /usr/lib/libfreetype.so.6.3.20
7f12c696f000-7f12c6974000 r--p 0007f000 09:00 229047                     /usr/lib/libfreetype.so.6.3.20
7f12c6974000-7f12c6975000 rw-p 00084000 09:00 229047                     /usr/lib/libfreetype.so.6.3.20
7Aborted (core dumped)