diff --git a/mk/common.mk b/mk/common.mk
index 4c92a0f0dc..40fb9cbc0f 100644
--- a/mk/common.mk
+++ b/mk/common.mk
@@ -1,42 +1,40 @@
 #
 # Copyright 2014-2023 the Pacemaker project contributors
 #
 # The version control history for this file may have further details.
 #
 # This source code is licensed under the GNU General Public License version 2
 # or later (GPLv2+) WITHOUT ANY WARRANTY.
 #
 
 #
 # Some variables to help with silent rules
 # https://www.gnu.org/software/automake/manual/html_node/Automake-silent_002drules-Option.html
 
 V ?= $(AM_DEFAULT_VERBOSITY)
 
 # When a make command is prefixed with one of the AM_V_* macros, it may also be
 # desirable to suffix the command with this, to silence stdout.
 PCMK_quiet = $(pcmk_quiet_$(V))
 pcmk_quiet_0 = >/dev/null
 pcmk_quiet_1 = 
 
 # AM_V_GEN is intended to be used in custom pattern rules, and replaces echoing
 # the command used with a more concise line with "GEN" and the name of the file
 # being generated. Our AM_V_* macros are similar but more descriptive.
 AM_V_MAN = $(am__v_MAN_$(V))
 am__v_MAN_0 = @echo "  MAN      $@";
 am__v_MAN_1 = 
 
 AM_V_SCHEMA = $(am__v_SCHEMA_$(V))
 am__v_SCHEMA_0 = @echo "  SCHEMA   $@";
 am__v_SCHEMA_1 = 
 
 AM_V_BOOK = $(am__v_BOOK_$(V))
 am__v_BOOK_0 = @echo "  BOOK    $(@:%/_build=%): $(BOOK_FORMATS)";
 am__v_BOOK_1 = 
 
 MAINTAINERCLEANFILES	= Makefile.in
 
 AM_CPPFLAGS		= -I$(top_builddir)/include 	\
-			  -I$(top_srcdir)/include 	\
-			  -I$(top_builddir)/libltdl 	\
-			  -I$(top_srcdir)/libltdl
+			  -I$(top_srcdir)/include