Hi! I tried to compile libgcrypt-1.1.10 on cygwin. There seems to be a bug in configure. It tries to detect whether symbols will have _ prefix or not. When I run configure it says this: checking for _ prefix in compiled symbols... no This should be yes in cygwin. It compiled fine when I modifed configure script to add following line to config.h: #define WITH_SYMBOL_UNDERSCORE 1 -- Osmo Paananen