In my ongoing bulk, eterm hit the conflict in devel/libast:

Can't install libast-0.7p12 because of conflicts (ksh93-1.0.10p0v0)

This works for me.

Index: Makefile
===================================================================
RCS file: /cvs/ports/devel/libast/Makefile,v
diff -u -p -r1.28 Makefile
--- Makefile	21 Jul 2025 15:31:49 -0000	1.28
+++ Makefile	30 Aug 2025 18:16:55 -0000
@@ -2,7 +2,7 @@ COMMENT=		library of assorted spiffy thi
 
 DISTNAME=		libast-0.7
 PKGNAME=		${DISTNAME}
-REVISION =		12
+REVISION =		13
 SHARED_LIBS +=	ast                  3.0      # .2.1
 CATEGORIES=		devel
 
Index: pkg/PLIST
===================================================================
RCS file: /cvs/ports/devel/libast/pkg/PLIST,v
diff -u -p -r1.6 PLIST
--- pkg/PLIST	28 Feb 2023 10:13:04 -0000	1.6
+++ pkg/PLIST	30 Aug 2025 18:24:07 -0000
@@ -1,4 +1,5 @@
-@conflict ksh93-*
+@conflict ksh93-<1.0.10p0v0
+@conflict ksh93-libshell-*
 bin/libast-config
 include/libast/
 include/libast.h