diff -Naruw a/raster/rt_core/Makefile.in b/raster/rt_core/Makefile.in
--- a/raster/rt_core/Makefile.in	2015-05-13 14:13:18.000000000 -0400
+++ b/raster/rt_core/Makefile.in	2015-12-14 16:49:49.166156232 -0500
@@ -18,7 +18,7 @@
 #
 #############################################################################
 
-AR = ar rs
+ARFLAGS = rs
 
 CC = @CC@
 LIBLWGEOM_LDFLAGS = ../../liblwgeom/.libs/liblwgeom.a
@@ -64,4 +64,4 @@
 	rm -f Makefile
 
 librtcore.a: $(RT_OBJS)
-	$(AR) $(RT_LIB) $(RT_OBJS)
+	$(AR) $(ARFLAGS) $(RT_LIB) $(RT_OBJS)