My OS is Linux debian 2.6.17-2-686 #1 SMP Wed Sep 13 16:34:10 UTC 2006 i686 GNU/Linux.
I try to use 'xboard -debug',and the following is :
+ gnuchessx Reset(1, 0) from gameMode 0 recognized 'normal' (-1) as variant normal
GameEnds(0, (null), 2) StartChildProcess (dir="") gnuchessx
2420 >first : xboard protover 2 xboard: Error writing to first chess program: Broken pipe 2562 <first : gnuchessx: No such file or directory
xboard: Failed to start first chess program gnuchessx on localhost: gnuchessx: No such file or directory