Hi This is what I did: 1) I close all cygwin apps. 2) I downloaded cygwin1-20050405.dll.bz2 and unzip it. 3) I rename its unzipped version to "cygwin1.dll". 4) I move this "cygwin1.dll" to "C:\cygwin\bin". Attached is the cygcheck.out. It reports the DLL as 1.5.15 but cygwin (package) as 1.5.13-1. Did I miss anything obvious?