diff --git a/dtool/src/attach/dtool.cshrc b/dtool/src/attach/dtool.cshrc
index e3c58d5eea..5b058ac3b6 100644
--- a/dtool/src/attach/dtool.cshrc
+++ b/dtool/src/attach/dtool.cshrc
@@ -18,7 +18,7 @@ else if ( $OS == "IRIX64" ) then
              /usr/sbin /usr/bsd /sbin /usr/bin /bin /usr/bin/X11 /usr/etc  \
              /usr/demos/bin /usr/local/bin )
   setenv LD_LIBRARY_PATH "/usr/local/lib:."
-else if (($OS == "CYGWIN_NT-5.1") || ($OS == "CYGWIN_NT-5.0") || ( $OS == "CYGWIN_NT-4.0" ) || ( $OS == "WINNT" )) then
+else if (($OS == "CYGWIN_NT-5.1") || ($OS == "CYGWIN_NT-6.0")|| ($OS == "CYGWIN_NT-5.0") || ( $OS == "CYGWIN_NT-4.0" ) || ( $OS == "WINNT" )) then
   set path = ( /bin /usr/bin /usr/lib /usr/local/bin /contrib/bin $path . )
   if ( $?LIB ) then
     setenv LIB "$LIB;"`cygpath -w /usr/lib`
@@ -72,7 +72,7 @@ if ( ! $?PENV ) then
       setenv PENV "Linux"
    else if ( $OS == "IRIX64" ) then
       setenv PENV "SGI"
-   else if (( $OS == "CYGWIN_NT-5.1") || ( $OS == "CYGWIN_NT-5.0") || ( $OS == "CYGWIN_NT-4.0" ) || ( $OS == "CYGWIN_98-4.10" ) || ( $OS == "WIN95" )) then
+   else if (( $OS == "CYGWIN_NT-5.1") || ( $OS == "CYGWIN_NT-5.0") || ( $OS == "CYGWIN_NT-6.0")|| ( $OS == "CYGWIN_NT-4.0" ) || ( $OS == "CYGWIN_98-4.10" ) || ( $OS == "WIN95" )) then
       setenv PENV "WIN32"
    else
       setenv PENV "SGI"