--- a/src/lib/function/Makefile.am
+++ b/src/lib/function/Makefile.am
@@ -4,7 +4,8 @@
 
 libfunc_la_SOURCES = Function.cc ScalarFunction.cc LinkFunction.cc	\
 VectorFunction.cc ArrayFunction.cc FunctionPtr.cc FuncTab.cc FuncError.cc \
-DPQFunction.cc DFunction.cc PFunction.cc QFunction.cc
+DPQFunction.cc DFunction.cc PFunction.cc QFunction.cc \
+ScalarLogDensity.cc VectorLogDensity.cc ArrayLogDensity.cc
 
 check_LTLIBRARIES = libfuntest.la
 libfuntest_la_SOURCES = testfun.cc