added some clarifying comments about -lcrypt and Tk 4.0
diff --git a/Modules/Setup.in b/Modules/Setup.in
index 44ad2b2..134aab9 100644
--- a/Modules/Setup.in
+++ b/Modules/Setup.in
@@ -101,7 +101,7 @@
fcntl fcntlmodule.c # fcntl(2) and ioctl(2)
pwd pwdmodule.c # pwd(3)
grp grpmodule.c # grp(3)
-crypt cryptmodule.c # crypt(3)
+crypt cryptmodule.c # -lcrypt # crypt(3); needs -lcrypt on some systems
select selectmodule.c # select(2); not on ancient System V
socket socketmodule.c # socket(2); not on ancient System V
signal signalmodule.c # signal(2)
@@ -237,6 +237,10 @@
# libraries/objects to the second line, and use that.
#
# In all cases also enable the last line (TKPATH).
+#
+# This was designed to build with Tk 3.6 and Tcl 7.3, but also seems
+# to work Tk 4.0 beta. (Tkinter.py hasn't been fixed though, so for
+# the time being Tk 3.6 is the version of choice!)
# *** Use ONE of the following two lines, see previous comments ***
#tkinter tkintermodule.c -I/usr/local/include -L/usr/local/lib -ltk -ltcl -lX11