diff --git a/lemon/Makefile.am b/lemon/Makefile.am
--- a/lemon/Makefile.am
+++ b/lemon/Makefile.am
@@ -6,14 +6,18 @@
 
 lib_LTLIBRARIES += lemon/libemon.la
 
-lemon_libemon_la_SOURCES =
+lemon_libemon_la_SOURCES = \
+        lemon/base.cc
 
 lemon_libemon_la_CXXFLAGS = $(GLPK_CFLAGS) $(CPLEX_CFLAGS) $(SOPLEX_CXXFLAGS)
 lemon_libemon_la_LDFLAGS = $(GLPK_LIBS) $(CPLEX_LIBS) $(SOPLEX_LIBS)
 
 lemon_HEADERS += \
-	lemon/list_graph.h
+	lemon/list_graph.h \
+        lemon/tolerance.h
 
-bits_HEADERS +=
+bits_HEADERS += \
+        lemon/bits/invalid.h \
+        lemon/bits/utility.h
 
 concept_HEADERS +=