--- a/media-video/mkvtoolnix/mkvtoolnix-81.0.ebuild	2023-12-13 23:40:38.000000000 -0500
+++ b/media-video/mkvtoolnix/mkvtoolnix-81.0.ebuild	2024-01-22 23:25:41.159290135 -0500
@@ -3,7 +3,7 @@
 
 EAPI=8
 
-inherit autotools flag-o-matic multiprocessing qmake-utils xdg
+inherit autotools flag-o-matic multiprocessing qmake-utils xdg prefix
 
 if [[ ${PV} == *9999 ]] ; then
 	inherit git-r3
@@ -102,6 +102,8 @@
 	# bug #692018
 	sed -i -e 's/pandoc/diSaBlEd/' ac/pandoc.m4 || die
 
+	hprefixify "${S}/ac/ax_docbook.m4"
+
 	eautoreconf
 
 	# remove bundled libs