--- a/itpp/base/sources.mk
+++ b/itpp/base/sources.mk
@@ -54,5 +54,3 @@
 	$(top_srcdir)/itpp/base/timing.cpp \
 	$(top_srcdir)/itpp/base/vec.cpp
 
-f_base_sources = \
-	$(top_srcdir)/itpp/base/zdotusub.f