diff --git a/lemon/Makefile.am b/lemon/Makefile.am
--- a/lemon/Makefile.am
+++ b/lemon/Makefile.am
@@ -27,6 +27,7 @@
         lemon/dfs.h \
         lemon/dijkstra.h \
         lemon/dim2.h \
+        lemon/dimacs.h \
 	lemon/elevator.h \
 	lemon/error.h \
 	lemon/full_graph.h \