Hi, For convenience, I often build binaries with -optl-static, and distribute them. Except for the slightly annoying necessity of adding -optl-pthread as well, this works great. Now I just upgraded my Ubuntu box from 9.10 (Karmic) to 10.4 (Lucid), and suddently static binaries refuse to work on other machines, specifically I get: openFile: invalid argument (Invalid argument) This seems to happen for any program trying to read a file, for instance: main = readFile "/etc/passwd" >>= putStrLn The program will compile and work as expected, but fails if I move it to a computer with an older distribution (I've tested RHEL and CentOS 5.4 so far). I tried strace, and the call to open appears to be similar, and succeed in all cases. Any ideas? -k -- If I haven't seen further, it is by standing in the footprints of giants