diff --git a/libmudflap/ChangeLog b/libmudflap/ChangeLog
index 4e0525c2f11..6689b971655 100644
--- a/libmudflap/ChangeLog
+++ b/libmudflap/ChangeLog
@@ -1,3 +1,9 @@
+2005-05-23  Alfred M. Szmidt  <ams@gnu.org>
+
+	PR libmudflap/21724
+	* Makefile.am (AM_MAKEFLAGS): Pass includedir.
+	* Makefile.in: Amend.
+
 2005-06-14  Frank Ch. Eigler  <fche@redhat.com>
 
 	PR mudflap/21023
diff --git a/libmudflap/Makefile.am b/libmudflap/Makefile.am
index 3be442a3139..64ba06aec21 100644
--- a/libmudflap/Makefile.am
+++ b/libmudflap/Makefile.am
@@ -91,6 +91,7 @@ AM_MAKEFLAGS = \
 	"infodir=$(infodir)" \
 	"libdir=$(libdir)" \
 	"prefix=$(prefix)" \
+	"includedir=$(includedir)" \
 	"AR=$(AR)" \
 	"AS=$(AS)" \
 	"CC=$(CC)" \
diff --git a/libmudflap/Makefile.in b/libmudflap/Makefile.in
index a96dac3e503..dfd433afe43 100644
--- a/libmudflap/Makefile.in
+++ b/libmudflap/Makefile.in
@@ -280,6 +280,7 @@ AM_MAKEFLAGS = \
 	"infodir=$(infodir)" \
 	"libdir=$(libdir)" \
 	"prefix=$(prefix)" \
+	"includedir=$(includedir)" \
 	"AR=$(AR)" \
 	"AS=$(AS)" \
 	"CC=$(CC)" \