diff --git a/lemon/Makefile.am b/lemon/Makefile.am
--- a/lemon/Makefile.am
+++ b/lemon/Makefile.am
@@ -7,6 +7,7 @@
 lib_LTLIBRARIES += lemon/libemon.la
 
 lemon_libemon_la_SOURCES = \
+        lemon/arg_parser.cc \
         lemon/base.cc \
         lemon/random.cc
 
@@ -15,6 +16,7 @@
 lemon_libemon_la_LDFLAGS = $(GLPK_LIBS) $(CPLEX_LIBS) $(SOPLEX_LIBS)
 
 lemon_HEADERS += \
+        lemon/arg_parser.h \
         lemon/dim2.h \
 	lemon/maps.h \
         lemon/random.h \