On 2008-03-24, Galchin Vasili
vigalchin@ubuntu:~/FTP/Haskell/unix-2.2.0.0$ runhaskell Setup.hs build Preprocessing library unix-2.2.0.0... MQueue.hsc: In function 'main':
MQueue.hsc:102:0: error: invalid application of 'sizeof' to incomplete type 'struct mq_attr'
MQueue.hsc:102:0: error: invalid application of 'sizeof' to incomplete type 'struct mq_attr'
MQueue.hsc:102:0: error: invalid application of 'sizeof' to incomplete type 'struct mq_attr' compiling dist/build/System/Posix/MQueue_hsc_make.c failed comma
This looks as if only a "struct mq_attr;" definition is found, which lets opaque types be defined in C -- only pointers to it may be allocated by the compiler, not the actual struct, nor can sizeof be taken. Does your system have both /usr/include/mqueue.h and /usr/include/bits/mqueue.h -- Aaron Denney -><-