The automated cocrystal solution pipeline and refinement applications in MIFit8 ( http://code.google.com/p/mifit/ ) employs arp_waters for water- picking and some automated error detection. However, arp_waters is deprecated in CCP4 6.1.1. For now, one solution (Linux or Windows) is simply to copy the arp_waters binary from /bin in CCP4 6.0.* to /bin in CCP4 6.1.1. Thanks to Martyn Winn for also reminding that on Linux the source code for arp_waters is still available and may still be built >Actually, it has not gone entirely, but was moved to the deprecated > folder: > > $CCP4/deprecated/src/arp_waters_ > > If you type "make" in $CCP4/deprecated/src you should get it back. We are examining alternatives for water-picking that workable in the context of automated refinement and are not aware of any other incompatibilities at this time. Thanks John Badger