https://github.com/festvox/flite/issues/86
https://github.com/festvox/flite/pull/92

From 14aa28529357ba13994a2bd90cfd11bfceeffcce Mon Sep 17 00:00:00 2001
From: Moritz Barsnick <barsnick@gmx.net>
Date: Thu, 23 Mar 2023 14:53:08 +0100
Subject: [PATCH] fix implicit dependency on flite_voice_list.c

Also make flite_lang_list a proper rule, so that it only builds once.

Both C files were repeatedly being clobbered, as were their respective
object files.

Convert flite_voice_list.c is into an explicit dependency with a creation
rule. flite_voice_list.o continues to be implicit from flite_voice_list.c.

Convert flite_lang_list into a similar, proper object rule.

Fixes https://github.com/festvox/flite/issues/86
--- a/main/Makefile
+++ b/main/Makefile
@@ -106,21 +106,16 @@ endif
 
 .NOTPARALLEL: $(ALL)
 
-flite_lang_list: 
-	rm -f flite_lang_list.c
+flite_lang_list.c:
 	$(TOP)/tools/make_lang_list $(LANGS) $(LEXES)
-	$(MAKE) flite_lang_list.o
 
-$(BINDIR)/flite$(EXEEXT): flite_main.o flite_lang_list $(flite_LIBS_deps)
+flite_voice_list.c:
 	$(TOP)/tools/make_voice_list $(VOICES)
-	rm -f flite_voice_list.o
-	$(MAKE) flite_voice_list.o
+
+$(BINDIR)/flite$(EXEEXT): flite_main.o flite_voice_list.o flite_lang_list.o $(flite_LIBS_deps)
 	$(CC) $(CFLAGS) -o $@ flite_main.o flite_voice_list.o flite_lang_list.o $(flite_LIBS_flags) $(LDFLAGS)
 
-$(BINDIR)/flitevox_info$(EXEEXT): flitevox_info_main.o flite_lang_list $(flite_LIBS_deps)
-	$(TOP)/tools/make_voice_list $(VOICES)
-	rm -f flite_voice_list.o
-	$(MAKE) flite_voice_list.o
+$(BINDIR)/flitevox_info$(EXEEXT): flitevox_info_main.o flite_voice_list.o flite_lang_list.o $(flite_LIBS_deps)
 	$(CC) $(CFLAGS) -o $@ flitevox_info_main.o flite_voice_list.o flite_lang_list.o $(flite_LIBS_flags) $(LDFLAGS)
 
 $(BINDIR)/world$(EXEEXT): world_main.c
@@ -144,10 +139,7 @@ each:
 	   $(MAKE) VOICE=$$i $(BINDIR)/flite_$$i ; \
 	done
 
-$(BINDIR)/flite_${VOICE}: flite_main.o flite_lang_list $(flite_LIBS_deps)
-	$(TOP)/tools/make_voice_list $(VOICE)
-	rm -f flite_voice_list.o
-	$(MAKE) flite_voice_list.o
+$(BINDIR)/flite_${VOICE}: flite_main.o flite_voice_list.o flite_lang_list.o $(flite_LIBS_deps)
 	$(CC) $(CFLAGS) -o $@ flite_main.o flite_voice_list.o flite_lang_list.o $(flite_LIBS_flags) $(LDFLAGS)
 
 install: