diff --git a/src/Prep/Terra/Makefile.am b/src/Prep/Terra/Makefile.am
index 21358d62..36fee627 100644
--- a/src/Prep/Terra/Makefile.am
+++ b/src/Prep/Terra/Makefile.am
@@ -1,6 +1,8 @@
 EXTRA_DIST = Makefile.gcc-2.95 Makefile.orig
 
-bin_PROGRAMS = terra xterra
+# don't build xterra by default
+# bin_PROGRAMS = terra xterra
+bin_PROGRAMS = terra
 
 terra_SOURCES = \
 	Array.h Geom.h GreedyInsert.cc GreedyInsert.h Heap.cc Heap.h \
@@ -11,11 +13,11 @@ terra_SOURCES = \
 
 terra_LDADD = $(opengl_LIBS)
 
-xterra_SOURCES = \
-	Array.h Geom.h GreedyInsert.cc GreedyInsert.h Heap.cc Heap.h \
-	Map.cc Map.h Mask.cc \
-	Mask.h Quadedge.cc Quadedge.h Subdivision.cc Subdivision.h Vec2.h \
-	Vec3.h cmdline.cc glHacks.cc glHacks.h greedy.cc gui.cc gui.h \
-	output.cc terra.h version.h xterra.cc
-
-xterra_LDADD = $(opengl_LIBS)
+# xterra_SOURCES = \
+#	Array.h Geom.h GreedyInsert.cc GreedyInsert.h Heap.cc Heap.h \
+#	Map.cc Map.h Mask.cc \
+#	Mask.h Quadedge.cc Quadedge.h Subdivision.cc Subdivision.h Vec2.h \
+#	Vec3.h cmdline.cc glHacks.cc glHacks.h greedy.cc gui.cc gui.h \
+#	output.cc terra.h version.h xterra.cc
+#
+# xterra_LDADD = $(opengl_LIBS)