I tried to opy the missing library to the amule dir
cp /Developer/SDKs/MacOSX10.5.sdk/usr/X11/lib/libpng12.0.dylib /Applications/net/aMule.app/Contents/MacOS/amule
but now, I have another error just when I start amule:
Process: launchd [77088]
Path: /Applications/net/aMule.app/Contents/MacOS/amule
Identifier: org.amule.aMule
Version:

(

)
Code Type: X86-64 (Native)
Parent Process: launchd [88]
Date/Time: 2008-08-10 18:14:45.837 +0200
OS Version: Mac OS X 10.5.4 (9E17)
Report Version: 6
Exception Type: EXC_BAD_ACCESS (SIGBUS)
Exception Codes: KERN_PROTECTION_FAILURE at 0x0000000000000000
Crashed Thread: 0
Thread 0 Crashed:
Thread 0 crashed with X86 Thread State (64-bit):
rax: 0x0000000000000000 rbx: 0x0000000000000000 rcx: 0x0000000000000000 rdx: 0x0000000000000000
rdi: 0x0000000000000000 rsi: 0x0000000000000000 rbp: 0x0000000000000000 rsp: 0x0000000000000000
r8: 0x0000000000000000 r9: 0x0000000000000055 r10: 0x0000000000000000 r11: 0x0000000000000000
r12: 0x0000000000000000 r13: 0x0000000000000000 r14: 0x0000000000000000 r15: 0x0000000000000000
rip: 0x0000000000000000 rfl: 0x0000000000010202 cr2: 0x0000000000000000
Binary Images:
0x1000 - 0x1cff3 +launchd

(

) <ff6483c852540c78e382fd98064ef2a7> /sbin/launchd
0x8fe00000 - 0x8fe2da53 dyld 96.2 (

) <7af47d3b00b2268947563c7fa8c59a07> /usr/lib/dyld
0x93922000 - 0x93a82ff3 libSystem.B.dylib

(

) <a12f397abf2285077b89bd726bff5b18> /usr/lib/libSystem.B.dylib
0x94a6d000 - 0x94a74fe9 libgcc_s.1.dylib

(

) <f53c808e87d1184c0f9df63aef53ce0b> /usr/lib/libgcc_s.1.dylib
0x94c50000 - 0x94c57ffe libbsm.dylib

(

) <d25c63378a5029648ffd4b4669be31bf> /usr/lib/libbsm.dylib
0x94cc6000 - 0x94ccafff libmathCommon.A.dylib

(

) /usr/lib/system/libmathCommon.A.dylib
0xffff0000 - 0xffff1780 libSystem.B.dylib

(

) /usr/lib/libSystem.B.dylib