arduino on debian squeeze

does anybody knows why am i getting this error while trying to run arduino on a debian squeeze install?

java.lang.UnsatisfiedLinkError: no rxtxSerial in java.library.path thrown while loading gnu.io.RXTXCommDriver
Exception in thread “main” java.lang.UnsatisfiedLinkError: no rxtxSerial in java.library.path
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1734)
at java.lang.Runtime.loadLibrary0(Runtime.java:823)
at java.lang.System.loadLibrary(System.java:1028)
at gnu.io.CommPortIdentifier.(CommPortIdentifier.java:123)
at processing.app.Editor.populateSerialMenu(Editor.java:965)
at processing.app.Editor.buildToolsMenu(Editor.java:717)
at processing.app.Editor.buildMenuBar(Editor.java:502)
at processing.app.Editor.(Editor.java:194)
at processing.app.Base.handleOpen(Base.java:709)
at processing.app.Base.handleOpen(Base.java:674)
at processing.app.Base.handleNew(Base.java:571)
at processing.app.Base.(Base.java:311)
at processing.app.Base.main(Base.java:200)

can’t figure what to do exactly. i’ve seen on arduino playground that i should edit edit LD_LIBRARY_PATH to point to /usr/lib/jni, but how do i do that? thanks!