diff --git a/Makefile b/Makefile
index 35b1962..977da1f 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
-RYFS := $(CURDIR)/meta/ryfs/ryfs.py
-FOX32ASM := ../fox32asm/target/release/fox32asm
-OKAMERON := $(CURDIR)/meta/okameron/okameron.lua
-GFX2INC := ../tools/gfx2inc/target/release/gfx2inc
+RYFS ?= $(CURDIR)/meta/ryfs/ryfs.py
+FOX32ASM ?= $(CURDIR)fox32asm/target/release/fox32asm
+OKAMERON ?= $(CURDIR)/meta/okameron/okameron.lua
+GFX2INC ?= $(CURDIR)/tools/gfx2inc/target/release/gfx2inc
 
 IMAGE_SIZE := 16777216
 ROM_IMAGE_SIZE := 65536
diff --git a/README.md b/README.md
index 5adda81..aca277e 100644
--- a/README.md
+++ b/README.md
@@ -10,9 +10,9 @@ Stable releases are available on the [Releases page](https://github.com/fox32-ar
 
 Prebuilt images of the latest commit are also available on the [GitHub Actions page](https://github.com/fox32-arch/fox32os/actions).
 
-### Building
+### Building (without nix)
 
-- Download [tools](https://github.com/fox32-arch/tools) and [fox32asm](https://github.com/fox32-arch/fox32asm).
+- Download [tools](https://github.com/fox32-arch/tools) and [fox32asm](https://github.com/fox32-arch/fox32asm) into the current directory.
   Either use the pre-built binaries or build them.
 - Run `make`
 
diff --git a/applications/barclock/main.asm b/applications/barclock/main.asm
index c86791c..d653d0d 100644
--- a/applications/barclock/main.asm
+++ b/applications/barclock/main.asm
@@ -91,5 +91,5 @@ minute_less_than_10:
 second_counter: data.8 0
 active_window_struct_ptr: data.32 0
 
-    #include "../../../fox32rom/fox32rom.def"
+    #include "../../fox32rom/fox32rom.def"
     #include "../../fox32os.def"
diff --git a/applications/bg/main.asm b/applications/bg/main.asm
index 0d7a8ba..df5dcdb 100644
--- a/applications/bg/main.asm
+++ b/applications/bg/main.asm
@@ -23,5 +23,5 @@
 bg_file_name: data.strz "bg.raw"
 bg_file_struct: data.fill 0, 32
 
-    #include "../../../fox32rom/fox32rom.def"
+    #include "../../fox32rom/fox32rom.def"
     #include "../../fox32os.def"
diff --git a/applications/fetcher/start.asm b/applications/fetcher/start.asm
index 704f38e..fbd2aba 100644
--- a/applications/fetcher/start.asm
+++ b/applications/fetcher/start.asm
@@ -88,5 +88,5 @@ menu_items_system_list:
     data.8 7                   ; menu width (usually longest item + 2)
     data.8 5 data.strz "About" ; text length, text, null-terminator
 
-    #include "../../../fox32rom/fox32rom.def"
+    #include "../../fox32rom/fox32rom.def"
     #include "../../fox32os.def"
diff --git a/applications/foxpaint/main.asm b/applications/foxpaint/main.asm
index e95c1ba..137e9b8 100644
--- a/applications/foxpaint/main.asm
+++ b/applications/foxpaint/main.asm
@@ -392,5 +392,5 @@ is_drawing: data.8 0
 brush_size: data.8 4
 color: data.32 0xFFFFFFFF
 
-    #include "../../../fox32rom/fox32rom.def"
+    #include "../../fox32rom/fox32rom.def"
     #include "../../fox32os.def"
diff --git a/applications/launcher/main.asm b/applications/launcher/main.asm
index 9341301..c0f9823 100644
--- a/applications/launcher/main.asm
+++ b/applications/launcher/main.asm
@@ -110,5 +110,5 @@ button_text: data.strz "  "
 icons:
     #include "icons.inc"
 
-    #include "../../../fox32rom/fox32rom.def"
+    #include "../../fox32rom/fox32rom.def"
     #include "../../fox32os.def"
diff --git a/applications/okmpaint/start.asm b/applications/okmpaint/start.asm
index 3c3e7f8..71e6185 100644
--- a/applications/okmpaint/start.asm
+++ b/applications/okmpaint/start.asm
@@ -65,5 +65,5 @@ menu_items_color_list:
     data.8 5 data.strz "Green" ; text length, text, null-terminator
     data.8 4 data.strz "Blue"  ; text length, text, null-terminator
 
-    #include "../../../fox32rom/fox32rom.def"
+    #include "../../fox32rom/fox32rom.def"
     #include "../../fox32os.def"
diff --git a/applications/serial/main.asm b/applications/serial/main.asm
index b802668..92d3099 100644
--- a/applications/serial/main.asm
+++ b/applications/serial/main.asm
@@ -67,5 +67,5 @@ stream_write_special:
     pop r0
     ret
 
-    #include "../../../fox32rom/fox32rom.def"
+    #include "../../fox32rom/fox32rom.def"
     #include "../../fox32os.def"
diff --git a/applications/sh/main.asm b/applications/sh/main.asm
index a18992d..deb97fb 100644
--- a/applications/sh/main.asm
+++ b/applications/sh/main.asm
@@ -336,5 +336,5 @@ shell_char_buffer: data.32 0
     #include "launch.asm"
 
     ; include system defs
-    #include "../../../fox32rom/fox32rom.def"
+    #include "../../fox32rom/fox32rom.def"
     #include "../../fox32os.def"
diff --git a/applications/terminal/main.asm b/applications/terminal/main.asm
index 4b69998..f993033 100644
--- a/applications/terminal/main.asm
+++ b/applications/terminal/main.asm
@@ -140,5 +140,5 @@ stream_struct:
     #include "text.asm"
 
     ; include system defs
-    #include "../../../fox32rom/fox32rom.def"
+    #include "../../fox32rom/fox32rom.def"
     #include "../../fox32os.def"
diff --git a/kernel/main.asm b/kernel/main.asm
index 54d337a..b40d39e 100644
--- a/kernel/main.asm
+++ b/kernel/main.asm
@@ -415,6 +415,6 @@ startup_bat_check_struct: data.fill 0, 32
 serial_stream: data.strz ":serial"
 serial_stream_struct: data.fill 0, 32
 
-    #include "../../fox32rom/fox32rom.def"
+    #include "../fox32rom/fox32rom.def"
 
 kernel_bottom: