I use this often enough while figuring out details of some perl tooling,
such as why update-plist is not quite doing what I want


Index: README.internals
===================================================================
RCS file: /vide/cvs/ports/infrastructure/mk/README.internals,v
diff -u -p -r1.19 README.internals
--- README.internals	10 Aug 2023 18:50:58 -0000	1.19
+++ README.internals	4 Dec 2025 13:26:54 -0000
@@ -425,6 +425,9 @@ _SHSCRIPT: prepend to a shell script in 
 
 _PERLSCRIPT: likewise for perl scripts.
 
+_PERLDSCRIPT: (unused) variation of _PERLSCRIPT for debugging a script,
+	runs through perl -d
+
 _ALL_VARIABLES _ALL_VARIABLES_INDEXED _ALL_VARIABLES_PER_ARCH:
 	stuff to dump in dump-vars. First is "simple" variable, second one
 	will depend on the subpackage, and for last one, must iterate
Index: pkgpath.mk
===================================================================
RCS file: /vide/cvs/ports/infrastructure/mk/pkgpath.mk,v
diff -u -p -r1.89 pkgpath.mk
--- pkgpath.mk	12 Nov 2023 12:55:08 -0000	1.89
+++ pkgpath.mk	4 Dec 2025 13:25:30 -0000
@@ -11,6 +11,7 @@ DANGEROUS ?= No
 LOCALBASE ?= /usr/local
 
 _PERLSCRIPT = /usr/bin/perl ${PORTSDIR}/infrastructure/bin
+_PERLDSCRIPT = /usr/bin/perl -d ${PORTSDIR}/infrastructure/bin
 
 .if !defined(PKGPATH)
 PKGPATH != PORTSDIR_PATH=${PORTSDIR_PATH} \