--- a/src/lib/distribution/Makefile.am
+++ b/src/lib/distribution/Makefile.am
@@ -3,4 +3,4 @@
 libdist_la_CPPFLAGS = -I$(top_srcdir)/src/include
 
 libdist_la_SOURCES = Distribution.cc ScalarDist.cc VectorDist.cc	\
-ArrayDist.cc DistPtr.cc DistTab.cc DistError.cc
+ArrayDist.cc DistPtr.cc DistTab.cc DistError.cc RScalarDist.cc