diff --git a/src/Airports/Makefile.am b/src/Airports/Makefile.am
index a87d26c49..73e3398ff 100644
--- a/src/Airports/Makefile.am
+++ b/src/Airports/Makefile.am
@@ -16,6 +16,6 @@ libAirports_a_SOURCES = \
 	xmlloader.cxx xmlloader.hxx 
 
 calc_loc_SOURCES = calc_loc.cxx
-calc_loc_LDADD = -lsgmath -lsgdebug -lsgmisc -lz $(base_LIBS)
+calc_loc_LDADD = -lsgmath -lsgdebug -lsgmisc -lsgstructure -lz $(base_LIBS)
 
 INCLUDES = -I$(top_srcdir) -I$(top_srcdir)/src
diff --git a/utils/GPSsmooth/Makefile.am b/utils/GPSsmooth/Makefile.am
index f44564f59..db6c26365 100644
--- a/utils/GPSsmooth/Makefile.am
+++ b/utils/GPSsmooth/Makefile.am
@@ -14,6 +14,7 @@ MIDGsmooth_SOURCES = \
 
 MIDGsmooth_LDADD = \
 	-lsgio -lsgserial -lsgtiming -lsgmath -lsgbucket -lsgmisc -lsgdebug \
+        -lsgstructure \
 	-lplibnet -lplibul \
 	$(joystick_LIBS) $(network_LIBS) $(base_LIBS) -lz
 
diff --git a/utils/Modeller/Makefile.am b/utils/Modeller/Makefile.am
index 58a47e01b..2d588757f 100644
--- a/utils/Modeller/Makefile.am
+++ b/utils/Modeller/Makefile.am
@@ -11,4 +11,5 @@ normalmap_SOURCES = normalmap.cxx
 normalmap_LDADD = -lsgscreen $(opengl_LIBS) $(base_LIBS) -lz
 
 photomodel_SOURCES = photomodel.cxx
-photomodel_LDADD = $(base_LIBS) -lsgbucket -lsgmath -lsgmisc -lsgdebug
+photomodel_LDADD = $(base_LIBS) -lsgbucket -lsgmath -lsgmisc -lsgdebug \
+  		    -lsgstructure