diff --git a/benchmarks/Makefile.am b/benchmarks/Makefile.am
index a93dd14..3d3dfe6 100644
--- a/benchmarks/Makefile.am
+++ b/benchmarks/Makefile.am
@@ -13,6 +13,7 @@ timebench2b_SOURCES = timebench2b.cc
 timebench2b_LDADD = ../src/libcln.la
 
 AM_CPPFLAGS = -I../include -I$(top_srcdir)/include
+DEFAULT_INCLUDES = -I.@am__isrc@
 
 EXTRA_DIST = README bench2.txt timebench2.sh
 
diff --git a/examples/Makefile.am b/examples/Makefile.am
index 627d72c..e20a75f 100644
--- a/examples/Makefile.am
+++ b/examples/Makefile.am
@@ -27,3 +27,4 @@ pi_LDADD = ../src/libcln.la
 
 
 AM_CPPFLAGS = -I../include -I$(top_srcdir)/include
+DEFAULT_INCLUDES = -I.@am__isrc@
diff --git a/src/Makefile.am b/src/Makefile.am
index ae092bb..3b36689 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1,6 +1,7 @@
 lib_LTLIBRARIES = libcln.la
 
 AM_CPPFLAGS = -I$(top_srcdir)/include -I$(top_srcdir)/src -I$(top_builddir)/include -I$(top_builddir)/src
+DEFAULT_INCLUDES = -I.@am__isrc@ -I$(top_builddir)/autoconf
 libcln_la_LDFLAGS = -version-info $(LT_VERSION_INFO)
 
 libcln_la_SOURCES = \
diff --git a/tests/Makefile.am b/tests/Makefile.am
index e6a3acd..1a3fd4c 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -44,6 +44,7 @@ EXTRA_PROGRAMS = $(ALL_TIMINGS)
 
 AM_CPPFLAGS = -I$(top_srcdir)/include -I$(top_srcdir)/src \
 -I$(top_builddir)/include -I$(top_builddir)/src
+DEFAULT_INCLUDES = -I.@am__isrc@ -I$(top_builddir)/autoconf
 
 
 exam_SOURCES = exam.h exam.cc \