--- origsrc/cmake-3.20.0/Source/kwsys/SystemTools.cxx
+++ src/cmake-3.20.0/Source/kwsys/SystemTools.cxx
@@ -3929,7 +3929,7 @@
 
 bool SystemToolsStatic::FileIsFullPath(const char* in_name, size_t len)
 {
-#if defined(_WIN32) || defined(__CYGWIN__)
+#if defined(_WIN32)
   // On Windows, the name must be at least two characters long.
   if (len < 2) {
     return false;