--- old/make/gensrc/GensrcCharsetCoder.gmk	2018-12-13 10:22:13.108117200 -0800
+++ new/make/gensrc/GensrcCharsetCoder.gmk	2018-12-13 10:22:12.624912300 -0800
@@ -36,7 +36,7 @@
 $(GENSRC_CHARSETCODER_DST)/CharsetDecoder.java: $(GENSRC_CHARSETCODER_TEMPLATE)
 	$(call MakeTargetDir)
 	$(RM) $@.tmp
-	$(TOOL_SPP) < $< >$@.tmp \
+	$(TOOL_SPP) -i$< -o$@.tmp \
 	    -Kdecoder \
 	    -DA='A' \
 	    -Da='a' \
@@ -71,7 +71,7 @@
 $(GENSRC_CHARSETCODER_DST)/CharsetEncoder.java: $(GENSRC_CHARSETCODER_TEMPLATE)
 	$(call MakeTargetDir)
 	$(RM) $@.tmp
-	$(TOOL_SPP) < $< >$@.tmp \
+	$(TOOL_SPP) -i$< -o$@.tmp \
 	    -Kencoder \
 	    -DA='An' \
 	    -Da='an' \