diff --git a/README.md b/README.md
index d7651d7..fa92ce7 100644
--- a/README.md
+++ b/README.md
@@ -10,14 +10,13 @@ For binary FR.
 
 See [here](https://gist.github.com/Zeturic/db1611cc7b17c3140f9b9af32e1b596b) for the prequisites and help in installing them.
 
-#### Cloning the repo and building the tools
+#### Cloning the repo
 
 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
deleted file mode 100644
index 2c5c9fa..0000000
--- a/build_tools.sh
+++ /dev/null
@@ -1,3 +0,0 @@
-#!/bin/sh
-
-make -C tools/preproc $BUILD_TOOLS_TARGET
diff --git a/makefile b/makefile
index c6a478a..e77f31a 100644
--- a/makefile
+++ b/makefile
@@ -14,9 +14,9 @@ SRC_FILES ?= $(wildcard src/*.c)
 OBJ_FILES ?= $(SRC_FILES:src/%.c=build/src/%.o)
 MAIN_ASM_INCLUDES ?= $(wildcard *.s)
 
-HEADER_DIRS ?= -I include -I gflib
+CPPFLAGS ?= -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 -MMD $(HEADER_DIRS) $(EXTRA_CFLAGS)
+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 -MMD $(CPPFLAGS) $(EXTRA_CFLAGS)
 
 LD = $(PREFIX)ld
 LDFLAGS = --relocatable -T rom.ld $(EXTRA_LDFLAGS)
@@ -24,7 +24,7 @@ LDFLAGS = --relocatable -T rom.ld $(EXTRA_LDFLAGS)
 SIZE = $(PREFIX)size
 SIZEFLAGS = -d -B
 
-PREPROC ?= tools/preproc/preproc
+PRET_PREPROC ?= pret-preproc
 
 ARMIPS ?= armips
 ARMIPS_FLAGS = -sym test.sym $(EXTRA_ARMIPS_FLAGS)
@@ -37,18 +37,13 @@ FREESIAFLAGS = --rom rom.gba --start-at $(START_AT)
 
 .DEFAULT_GOAL = all
 
-.PHONY: all spotless clean clean-tools md5
+.PHONY: all clean md5
 
 all: test.gba
 
-spotless: clean clean-tools
-
 clean:
 	rm -rf build test.gba test.sym $(CLEANABLE_FILES)
 
-clean-tools:
-	+BUILD_TOOLS_TARGET=clean ./build_tools.sh
-
 md5: test.gba
 	@md5sum test.gba
 
@@ -62,7 +57,7 @@ build/linked.alloc: rom.gba build/linked.sz
 
 build/src/%.o: src/%.c charmap.txt
 	@mkdir -p build/src
-	(echo '#line 1 "$<"' && $(PREPROC) "$<" charmap.txt) | $(CC) $(CFLAGS) -MF "$(@:%.o=%.d)" -MT "$@" -o "$@" -
+	(echo '#line 1 "$<"' && $(PRET_PREPROC) "$<" charmap.txt) | $(CC) $(CFLAGS) -MF "$(@:%.o=%.d)" -MT "$@" -o "$@" -
 
 build/linked.o: $(OBJ_FILES) rom.ld
 	@mkdir -p build