diff --git a/lemon/Makefile.am b/lemon/Makefile.am
--- a/lemon/Makefile.am
+++ b/lemon/Makefile.am
@@ -17,6 +17,7 @@
 lemon_HEADERS += \
         lemon/dim2.h \
 	lemon/maps.h \
+	lemon/math.h \
         lemon/random.h \
 	lemon/list_graph.h \
         lemon/tolerance.h