diff --git a/README.md b/README.md
index 00f08ad..4ad50cf 100644
--- a/README.md
+++ b/README.md
@@ -10,13 +10,14 @@ For binary FR.
 
 See [here](https://gist.github.com/Zeturic/db1611cc7b17c3140f9b9af32e1b596b) for the prequisites and help in installing them.
 
-#### Cloning the repo
+#### Cloning the repo and building the tools
 
 Open your terminal to whatever folder you want to download this repo into. Then, do the following to download the repo:
 
 ```shell
 $ git clone https://github.com/Zeturic/bpre-trade-stuff.git
 $ cd bpre-trade-stuff
+$ ./build_tools.sh
 ```
 
 #### Adding your ROM
diff --git a/build_tools.sh b/build_tools.sh
index 4eeb7d3..ca31eec 100644
--- a/build_tools.sh
+++ b/build_tools.sh
@@ -1,13 +1,4 @@
 #!/bin/sh
 
-unset CC
-unset CXX
-unset AS
-unset AR
-unset OBJCOPY
-unset STRIP
-unset NM
-unset RANLIB
-
 make -C tools/scaninc $BUILD_TOOLS_TARGET
 make -C tools/preproc $BUILD_TOOLS_TARGET
diff --git a/makefile b/makefile
index 3ec8397..eb40250 100644
--- a/makefile
+++ b/makefile
@@ -6,17 +6,20 @@ endif
 
 include $(DEVKITARM)/base_tools
 include config.mk
+include project.mk
 
 # ------------------------------------------------------------------------------
 
-SRC_FILES = $(filter-out src/sInGameTrades.c, $(wildcard src/*.c))
-OBJ_FILES = $(SRC_FILES:src/%.c=build/src/%.o)
-MAIN_ASM_INCLUDES = $(wildcard *.s)
+SRC_FILES ?= $(wildcard src/*.c)
+OBJ_FILES ?= $(SRC_FILES:src/%.c=build/src/%.o)
+MAIN_ASM_INCLUDES ?= $(wildcard *.s)
 
-CFLAGS = -O2 -mlong-calls -Wall -Wextra -mthumb -mno-thumb-interwork -fno-inline -fno-builtin -std=gnu11 -mabi=apcs-gnu -mcpu=arm7tdmi -march=armv4t -mtune=arm7tdmi -x c -c -I include -I gflib -D NUM_INGAME_TRADES=$(NUM_INGAME_TRADES) -D INSERT_INGAME_TRADE_HACK=$(INSERT_INGAME_TRADE_HACK)
+HEADER_DIRS ?= -I include -I gflib
+
+CFLAGS = -O2 -mlong-calls -Wall -Wextra -mthumb -mno-thumb-interwork -fno-inline -fno-builtin -std=gnu11 -mabi=apcs-gnu -mcpu=arm7tdmi -march=armv4t -mtune=arm7tdmi -x c -c $(HEADER_DIRS) $(EXTRA_CFLAGS)
 
 LD = $(PREFIX)ld
-LDFLAGS = --relocatable -T rom.ld --defsym sInGameTradesPtr=$(sInGameTradesPtr)
+LDFLAGS = --relocatable -T rom.ld $(EXTRA_LDFLAGS)
 
 SIZE = $(PREFIX)size
 SIZEFLAGS = -d -B
@@ -24,51 +27,33 @@ SIZEFLAGS = -d -B
 PREPROC = tools/preproc/preproc
 SCANINC = tools/scaninc/scaninc
 
-TOOLS = $(PREPROC) $(SCANINC)
-
 ARMIPS ?= armips
-ARMIPS_FLAGS = -sym test.sym -equ NUM_INGAME_TRADES $(NUM_INGAME_TRADES) -equ INSERT_INGAME_TRADE_HACK $(INSERT_INGAME_TRADE_HACK)
-
-PYTHON ?= python3
+ARMIPS_FLAGS = -sym test.sym $(EXTRA_ARMIPS_FLAGS)
 
+PYTHON ?= python
 FREESIA = $(PYTHON) tools/freesia
-FREESIA_FLAGS = --rom rom.gba --start-at $(START_AT)
-
-TRADESCANTIA = $(PYTHON) tools/tradescantia
-TRADESCANTIA_FLAGS = --rom rom.gba --pointer $(sInGameTradesPtr) --num-trades $(NUM_INGAME_TRADES)
-
-ifneq ($(ABILITYNUM_HAS_ALREADY_BEEN_MOVED),0)
-TRADESCANTIA_FLAGS += --modified-format
-endif
-
-sInGameTradesPtr = 0x08053CA4
+FREESIAFLAGS = --rom rom.gba --start-at $(START_AT)
 
 # ------------------------------------------------------------------------------
 
-.PHONY: all spotless clean clean-tools repoint-cursor-options md5
+.PHONY: all spotless clean clean-tools md5
 
 all: test.gba
 
 spotless: clean clean-tools
 
 clean:
-	rm -rf build test.gba test.sym src/sInGameTrades.c
+	rm -rf build test.gba test.sym
 
 clean-tools:
 	+BUILD_TOOLS_TARGET=clean ./build_tools.sh
 
-repoint-cursor-options:
-	$(ARMIPS) repoint-cursor-options.asm
-
 md5: test.gba
 	@md5sum test.gba
 
 # ------------------------------------------------------------------------------
 
-$(TOOLS):
-	+./build_tools.sh
-
-build/src/%.o: src/%.c charmap.txt $(PREPROC)
+build/src/%.o: src/%.c charmap.txt
 	@mkdir -p build/src
 	(echo '#line 1 "$<"' && $(PREPROC) "$<" charmap.txt) | $(CC) $(CFLAGS) -o "$@" -
 
@@ -76,17 +61,12 @@ build/linked.o: $(OBJ_FILES) rom.ld
 	@mkdir -p build
 	$(LD) $(LDFLAGS) $(OBJ_FILES) -o "$@"
 
-test.gba: rom.gba main.asm build/linked.o $(MAIN_ASM_INCLUDES) build/src/sInGameTrades.o
+test.gba: rom.gba main.asm build/linked.o $(MAIN_ASM_INCLUDES)
 	$(eval NEEDED_BYTES = $(shell PATH="$(PATH)" $(SIZE) $(SIZEFLAGS) build/linked.o |  awk 'FNR == 2 {print $$4}'))
-	$(ARMIPS) $(ARMIPS_FLAGS) main.asm -definelabel allocation $(shell $(FREESIA) $(FREESIA_FLAGS) --needed-bytes $(NEEDED_BYTES)) -equ allocation_size $(NEEDED_BYTES)
+	$(ARMIPS) $(ARMIPS_FLAGS) main.asm -definelabel allocation $(shell $(FREESIA) $(FREESIAFLAGS) --needed-bytes $(NEEDED_BYTES)) -equ allocation_size $(NEEDED_BYTES)
 
-build/dep/src/%.d: src/%.c $(SCANINC)
+build/dep/src/%.d: src/%.c
 	@mkdir -p build/dep/src
-	@$(SCANINC) -I include $< | awk '{print "$(<:src/%.c=build/src/%.o) $@ : "$$0}' > "$@"
+	@$(SCANINC) $(HEADER_DIRS) $< | awk '{print "$(<:src/%.c=build/src/%.o) $@ : "$$0}' > "$@"
 
 include $(SRC_FILES:src/%.c=build/dep/src/%.d)
-
-# ------------------------------------------------------------------------------
-
-src/sInGameTrades.c: rom.gba
-	$(TRADESCANTIA) $(TRADESCANTIA_FLAGS) --output "$@"
diff --git a/project.mk b/project.mk
new file mode 100644
index 0000000..ad8d92f
--- /dev/null
+++ b/project.mk
@@ -0,0 +1,23 @@
+SRC_FILES = $(filter-out src/sInGameTrades.c, $(wildcard src/*.c))
+
+EXTRA_CFLAGS = -D NUM_INGAME_TRADES=$(NUM_INGAME_TRADES) -D INSERT_INGAME_TRADE_HACK=$(INSERT_INGAME_TRADE_HACK)
+
+EXTRA_LDFLAGS = --defsym sInGameTradesPtr=$(sInGameTradesPtr)
+
+EXTRA_ARMIPS_FLAGS = -equ NUM_INGAME_TRADES $(NUM_INGAME_TRADES) -equ INSERT_INGAME_TRADE_HACK $(INSERT_INGAME_TRADE_HACK)
+
+TRADESCANTIA = $(PYTHON) tools/tradescantia
+TRADESCANTIA_FLAGS = --rom rom.gba --pointer $(sInGameTradesPtr) --num-trades $(NUM_INGAME_TRADES)
+
+ifneq ($(ABILITYNUM_HAS_ALREADY_BEEN_MOVED),0)
+TRADESCANTIA_FLAGS += --modified-format
+endif
+
+sInGameTradesPtr = 0x08053CA4
+
+# ------------------------------------------------------------------------------
+
+src/sInGameTrades.c: rom.gba
+	$(TRADESCANTIA) $(TRADESCANTIA_FLAGS) --output "$@"
+
+test.gba: build/src/sInGameTrades.o