wfarr@localhost:~/src/darcs-1.0.9$ ./configure --prefix=/usr/local
checking for darcs... no
checking the release state... release
checking for gcc... gcc
checking for C compiler default output file name... a.out
checking whether the C compiler works... yes
checking whether we are cross compiling... no
checking for suffix of executables...
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ISO C89... none needed
checking how to run the C preprocessor... gcc -E
checking for a BSD-compatible install... /usr/bin/install -c
checking for ghc... ghc
checking where GHC keeps its libraries... /usr/local/lib/ghc-6.8.2
checking GHC.Handle.openFd... NOT old API
checking GHC.Handle.openFd new API... failed
configure: error: Couldnt figure out how to call GHC.Handle.openFd!