diff --git a/lemon/Makefile.am b/lemon/Makefile.am
--- a/lemon/Makefile.am
+++ b/lemon/Makefile.am
@@ -16,6 +16,7 @@
 #lemon_libemon_la_LDFLAGS = $(GLPK_LIBS) $(CPLEX_LIBS) $(SOPLEX_LIBS)
 
 lemon_HEADERS += \
+	lemon/adaptors.h \
         lemon/arg_parser.h \
 	lemon/assert.h \
         lemon/bfs.h \