FSA

Confirm. Minecraft 1.4.5. Gentoo Linux:
Linux fsa-mobile 3.6.8-gentoo #1 SMP Tue Nov 27 12:54:36 YEKT 2012 x86_64 AMD Athlon(tm) X2 Dual-Core QL-65 AuthenticAMD GNU/Linux

fsa@fsa-mobile ~/Games $ java -jar minecraft.jar
Exception in thread "Thread-3" java.lang.UnsatisfiedLinkError: /home/fsa/.minecraft/bin/natives/liblwjgl.so: /home/fsa/.minecraft/bin/natives/liblwjgl.so: неправильный класс ELF: ELFCLASS32 (Possible cause: architecture word width mismatch)
at java.lang.ClassLoader$NativeLibrary.load(Native Method)
at java.lang.ClassLoader.loadLibrary1(ClassLoader.java:1939)
at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1864)
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1825)
at java.lang.Runtime.load0(Runtime.java:792)
at java.lang.System.load(System.java:1059)
at org.lwjgl.Sys$1.run(Sys.java:69)
at java.security.AccessController.doPrivileged(Native Method)
at org.lwjgl.Sys.doLoadLibrary(Sys.java:65)
at org.lwjgl.Sys.loadLibrary(Sys.java:81)
at org.lwjgl.Sys.<clinit>(Sys.java:98)
at net.minecraft.client.Minecraft.F(SourceFile:1975)
at asr.<init>(SourceFile:20)
at net.minecraft.client.Minecraft.<init>(SourceFile:75)
at asi.<init>(SourceFile:36)
at net.minecraft.client.MinecraftApplet.init(SourceFile:36)
at net.minecraft.Launcher.replace(Launcher.java:134)
at net.minecraft.Launcher$1.run(Launcher.java:78)