compiling application with prof results in undefined references

Hi all, I have an application that uses a package called 'uust'. Normally I would compile using; ghc -O2 -o genAST -fglasgow-exts -package uust GenAst.hs This works fine. However, I want to profile my application and therefore need to add -prof. The uust package was compiled for profiling (there are _p files), but when I compile using; ghc -prof -O2 -o genAST -fglasgow-exts -package uust GenAst.hs I get undefined references during the link phase; GenAST.o(.rodata+0xe5f0): undefined reference to `UUziParsingziInterface_lvl8_closure' GenAST.o(.rodata+0xe630): undefined reference to `UUziParsingziInterface_zdwevalStepsIOzq_closure' GenAST.o(.rodata+0xe6cc): undefined reference to `UUziPrettyziBasic_lvl19_closure' GenAST.o(.rodata+0xe6e8): undefined reference to `UUziParsingziInterface_lvl8_closure' GenAST.o(.rodata+0xe724): undefined reference to `UUziParsingziInterface_zdwevalStepsIOzq_closure' and many many more. I'm kinda in the dark here what I'm doing wrong. Can anyone help? regards, Niels PS I'm using ghc-6.4 (and have ghc-prof of course).