I am using the RawHide tcltk-8.2.3-36 package with the following changes:

* Expect version upgraded to 5.31.8.
* Tcl and Tk versions upgraded to 8.3.1.
* Removed patches that are no longer necessary after Tcl and Tk upgrades.
* Change Expect "cd" build commands because the Expect source code now
unpacks into a directory with a hyphen in it.

With these changes, the following Expect script does not work properly:

#!/usr/bin/expect --

--- cut here ---
set timeout 2
set pid [fork]

if {! $pid} {
    spawn echo ready
    expect {
	{ready} {
	    send_error "got ready\n"
	}
	default {
	    send_error "didn't get ready\n"
	}
    }
}
--- cut here ---

It should print "got ready", but instead it prints "didn't get ready".

I solved this problem by removing "--enable-threads" from the spec file.

I think that the "experimental" --enable-threads should be removed until
it's a bit less experimental.