diff --git a/Makefile b/Makefile
index dde15c644a..6db6c62428 100644
--- a/Makefile
+++ b/Makefile
@@ -262,7 +262,7 @@ clean: tidy clean-tools clean-generated clean-assets
 clean-assets:
 	rm -f $(MID_SUBDIR)/*.s
 	rm -f $(DATA_ASM_SUBDIR)/layouts/layouts.inc $(DATA_ASM_SUBDIR)/layouts/layouts_table.inc
-	rm -f $(DATA_ASM_SUBDIR)/maps/connections.inc $(DATA_ASM_SUBDIR)/maps/events.inc $(DATA_ASM_SUBDIR)/maps/groups.inc $(DATA_ASM_SUBDIR)/maps/headers.inc
+	rm -f $(DATA_ASM_SUBDIR)/maps/connections.inc $(DATA_ASM_SUBDIR)/maps/events.inc $(DATA_ASM_SUBDIR)/maps/groups.inc $(DATA_ASM_SUBDIR)/maps/headers.inc $(DATA_SRC_SUBDIR)/map_group_count.h
 	find sound -iname '*.bin' -exec rm {} +
 	find . \( -iname '*.1bpp' -o -iname '*.4bpp' -o -iname '*.8bpp' -o -iname '*.gbapal' -o -iname '*.lz' -o -iname '*.rl' -o -iname '*.latfont' -o -iname '*.hwjpnfont' -o -iname '*.fwjpnfont' \) -exec rm {} +
 	find $(DATA_ASM_SUBDIR)/maps \( -iname 'connections.inc' -o -iname 'events.inc' -o -iname 'header.inc' \) -exec rm {} +
@@ -298,6 +298,7 @@ generated: $(AUTO_GEN_TARGETS)
 %.gbapal: %.png ; $(GFX) $< $@
 %.lz: % ; $(GFX) $< $@
 %.rl: % ; $(GFX) $< $@
+$(CRY_SUBDIR)/uncomp_%.bin: $(CRY_SUBDIR)/uncomp_%.aif ; $(AIF) $< $@
 $(CRY_SUBDIR)/%.bin: $(CRY_SUBDIR)/%.aif ; $(AIF) $< $@ --compress
 sound/%.bin: sound/%.aif ; $(AIF) $< $@
 
@@ -325,6 +326,9 @@ $(C_BUILDDIR)/librfu_intr.o: CFLAGS := -O2 -mthumb-interwork -quiet
 else
 $(C_BUILDDIR)/librfu_intr.o: CFLAGS := -mthumb-interwork -O2 -mabi=apcs-gnu -mtune=arm7tdmi -march=armv4t -fno-toplevel-reorder -Wno-pointer-to-int-cast
 $(C_BUILDDIR)/berry_crush.o: override CFLAGS += -Wno-address-of-packed-member
+$(C_BUILDDIR)/pokedex_plus_hgss.o: CFLAGS := -mthumb -mthumb-interwork -O2 -mabi=apcs-gnu -mtune=arm7tdmi -march=armv4t -Wno-pointer-to-int-cast -std=gnu17 -Werror -Wall -Wno-strict-aliasing -Wno-attribute-alias -Woverride-init
+# Annoyingly we can't turn this on just for src/data/trainers.h
+$(C_BUILDDIR)/data.o: CFLAGS += -fno-show-column -fno-diagnostics-show-caret
 endif
 
 # Dependency rules (for the *.c & *.s sources to .o files)
@@ -417,6 +421,14 @@ $(OBJ_DIR)/sym_ewram.ld: sym_ewram.txt
 $(DATA_SRC_SUBDIR)/pokemon/teachable_learnsets.h: $(DATA_ASM_BUILDDIR)/event_scripts.o
 	python3 $(TOOLS_DIR)/learnset_helpers/teachable.py
 
+# NOTE: Based on C_DEP above, but without NODEP and KEEP_TEMPS handling.
+define TEST_DEP
+$1: $2 $$(shell $(SCANINC) -I include -I $(TOOLS_DIR)/agbcc/include -I gflib $2)
+	@echo "$$(CC1) <flags> -o $$@ $$<"
+	@$$(CPP) $$(CPPFLAGS) $$< | $$(PREPROC) -i $$< charmap.txt | $$(CC1) $$(CFLAGS) -o - - | cat - <(echo -e ".text\n\t.align\t2, 0") | $$(AS) $$(ASFLAGS) -o $$@ -
+endef
+$(foreach src, $(TEST_SRCS), $(eval $(call TEST_DEP,$(patsubst $(TEST_SUBDIR)/%.c,$(TEST_BUILDDIR)/%.o,$(src)),$(src),$(patsubst $(TEST_SUBDIR)/%.c,%,$(src)))))
+
 # Linker script
 ifeq ($(MODERN),0)
 LD_SCRIPT := ld_script.ld