diff --git a/app-editors/emacs/emacs-26.3-r23.ebuild b/app-editors/emacs/emacs-26.3-r23.ebuild
index 51b1afa837644..c777612a18239 100644
--- a/app-editors/emacs/emacs-26.3-r23.ebuild
+++ b/app-editors/emacs/emacs-26.3-r23.ebuild
@@ -297,8 +297,7 @@ src_install() {
 	fi
 
 	sed -e "${cdir:+#}/^Y/d" -e "s/^[XY]//" >"${T}/${SITEFILE}" <<-EOF || die
-	X
-	;;; ${EMACS_SUFFIX} site-lisp configuration
+	;;; ${EMACS_SUFFIX} site-lisp configuration  -*-lexical-binding:t-*-
 	X
 	(when (string-equal emacs-version "${FULL_VERSION}")
 	Y  (setq find-function-C-source-directory
diff --git a/app-editors/emacs/emacs-27.2-r21.ebuild b/app-editors/emacs/emacs-27.2-r21.ebuild
index dd940de142188..f309f5846a21a 100644
--- a/app-editors/emacs/emacs-27.2-r21.ebuild
+++ b/app-editors/emacs/emacs-27.2-r21.ebuild
@@ -362,8 +362,7 @@ src_install() {
 	fi
 
 	sed -e "${cdir:+#}/^Y/d" -e "s/^[XY]//" >"${T}/${SITEFILE}" <<-EOF || die
-	X
-	;;; ${EMACS_SUFFIX} site-lisp configuration
+	;;; ${EMACS_SUFFIX} site-lisp configuration  -*-lexical-binding:t-*-
 	X
 	(when (string-equal emacs-version "${FULL_VERSION}")
 	Y  (setq find-function-C-source-directory
diff --git a/app-editors/emacs/emacs-28.2-r17.ebuild b/app-editors/emacs/emacs-28.2-r17.ebuild
index 81acdf944ea3a..dbca7e7c634ad 100644
--- a/app-editors/emacs/emacs-28.2-r17.ebuild
+++ b/app-editors/emacs/emacs-28.2-r17.ebuild
@@ -473,8 +473,7 @@ src_install() {
 	fi
 
 	sed -e "${cdir:+#}/^Y/d" -e "s/^[XY]//" >"${T}/${SITEFILE}" <<-EOF || die
-	X
-	;;; ${EMACS_SUFFIX} site-lisp configuration
+	;;; ${EMACS_SUFFIX} site-lisp configuration  -*-lexical-binding:t-*-
 	X
 	(when (string-equal emacs-version "${FULL_VERSION}")
 	Y  (setq find-function-C-source-directory
diff --git a/app-editors/emacs/emacs-29.4-r3.ebuild b/app-editors/emacs/emacs-29.4-r3.ebuild
index 24f08534cf910..db25a8eb8e589 100644
--- a/app-editors/emacs/emacs-29.4-r3.ebuild
+++ b/app-editors/emacs/emacs-29.4-r3.ebuild
@@ -555,8 +555,7 @@ src_install() {
 	fi
 
 	sed -e "${cdir:+#}/^Y/d" -e "s/^[XY]//" >"${T}/${SITEFILE}" <<-EOF || die
-	X
-	;;; ${EMACS_SUFFIX} site-lisp configuration
+	;;; ${EMACS_SUFFIX} site-lisp configuration  -*-lexical-binding:t-*-
 	X
 	(when (string-equal emacs-version "${FULL_VERSION}")
 	Y  (setq find-function-C-source-directory
diff --git a/app-editors/emacs/emacs-30.1-r1.ebuild b/app-editors/emacs/emacs-30.1-r1.ebuild
index cd0514ff09bf8..6c5e55e8a0307 100644
--- a/app-editors/emacs/emacs-30.1-r1.ebuild
+++ b/app-editors/emacs/emacs-30.1-r1.ebuild
@@ -532,8 +532,7 @@ src_install() {
 	fi
 
 	sed -e "${cdir:+#}/^Y/d" -e "s/^[XY]//" >"${T}/${SITEFILE}" <<-EOF || die
-	X
-	;;; ${EMACS_SUFFIX} site-lisp configuration
+	;;; ${EMACS_SUFFIX} site-lisp configuration  -*-lexical-binding:t-*-
 	X
 	(when (string-equal emacs-version "${FULL_VERSION}")
 	Y  (setq find-function-C-source-directory
diff --git a/app-editors/emacs/emacs-30.1.9999.ebuild b/app-editors/emacs/emacs-30.1.9999.ebuild
index 48048d101f14c..9731a4eb43058 100644
--- a/app-editors/emacs/emacs-30.1.9999.ebuild
+++ b/app-editors/emacs/emacs-30.1.9999.ebuild
@@ -527,8 +527,7 @@ src_install() {
 	fi
 
 	sed -e "${cdir:+#}/^Y/d" -e "s/^[XY]//" >"${T}/${SITEFILE}" <<-EOF || die
-	X
-	;;; ${EMACS_SUFFIX} site-lisp configuration
+	;;; ${EMACS_SUFFIX} site-lisp configuration  -*-lexical-binding:t-*-
 	X
 	(when (string-equal emacs-version "${FULL_VERSION}")
 	Y  (setq find-function-C-source-directory
diff --git a/app-editors/emacs/emacs-31.0.9999.ebuild b/app-editors/emacs/emacs-31.0.9999.ebuild
index ca9ff8677e415..41c75a6d64639 100644
--- a/app-editors/emacs/emacs-31.0.9999.ebuild
+++ b/app-editors/emacs/emacs-31.0.9999.ebuild
@@ -524,8 +524,7 @@ src_install() {
 	fi
 
 	sed -e "${cdir:+#}/^Y/d" -e "s/^[XY]//" >"${T}/${SITEFILE}" <<-EOF || die
-	X
-	;;; ${EMACS_SUFFIX} site-lisp configuration
+	;;; ${EMACS_SUFFIX} site-lisp configuration  -*-lexical-binding:t-*-
 	X
 	(when (string-equal emacs-version "${FULL_VERSION}")
 	Y  (setq find-function-C-source-directory