diff --git a/lemon/Makefile.am b/lemon/Makefile.am
--- a/lemon/Makefile.am
+++ b/lemon/Makefile.am
@@ -15,6 +15,7 @@
 lemon_libemon_la_LDFLAGS = $(GLPK_LIBS) $(CPLEX_LIBS) $(SOPLEX_LIBS)
 
 lemon_HEADERS += \
+        lemon/concept_check.h \
         lemon/dim2.h \
 	lemon/error.h \
 	lemon/list_graph.h \