+you should say \*(``\-lpanel \-lncurses\*('', not the other way around
+(which would give a link-error with static libraries).
+.SH PORTABILITY
+.PP
+The panel facility was documented in SVr4.2 in
+\fICharacter User Interface Programming (UNIX SVR4.2)\fP.
+.PP
+It is not part of X/Open Curses.
+.PP
+A few implementations exist:
+.bP
+Systems based on SVr4 source code,
+e.g., Solaris, provide this library.
+.bP
+\fBncurses\fP (since version 0.6 in 1993)
+and \fBPDCurses\fP (since version 2.2 in 1995)
+provide a panel library whose common ancestor
+was a public domain implementation by Warren Tucker
+published in \fIu386mon\fP 2.20 (1990).
+.IP
+According to Tucker, the SystemV panel library
+was first released in SVr3.2 (1988),
+and his implementation helped with a port to SVr3.1 (1987).
+.IP
+Several developers have improved each of these;
+they are no longer the same as Tucker's implementation.
+.bP
+NetBSD 8 (2018)
+has a panel library begun by Valery Ushakov in 2015.
+This is based on the AT&T documentation.