diff --git a/Makefile b/Makefile
index 94ed865d..dd13daf1 100644
--- a/Makefile
+++ b/Makefile
@@ -193,11 +193,11 @@ test-clean:
 
 .PHONY: toolchain
 toolchain:
-	MAKE="$(MAKE)" aux/make_toolchain.sh "`pwd`/toolchain" -j$(NCPUS)
+	MAKE="$(MAKE)" build-aux/make_toolchain.sh "`pwd`/toolchain" -j$(NCPUS)
 
 gnu-efi:
 	git clone https://github.com/limine-bootloader/gnu-efi.git --branch=3.0.14 --depth=1 $@
-	cp aux/elf/* gnu-efi/inc/
+	cp build-aux/elf/* gnu-efi/inc/
 
 ovmf-x64:
 	mkdir -p ovmf-x64
diff --git a/aux/elf/elf.h b/build-aux/elf/elf.h
similarity index 100%
rename from aux/elf/elf.h
rename to build-aux/elf/elf.h
diff --git a/aux/elf/elf32.h b/build-aux/elf/elf32.h
similarity index 100%
rename from aux/elf/elf32.h
rename to build-aux/elf/elf32.h
diff --git a/aux/elf/elf64.h b/build-aux/elf/elf64.h
similarity index 100%
rename from aux/elf/elf64.h
rename to build-aux/elf/elf64.h
diff --git a/aux/elf/elf_common.h b/build-aux/elf/elf_common.h
similarity index 100%
rename from aux/elf/elf_common.h
rename to build-aux/elf/elf_common.h
diff --git a/aux/make_toolchain.sh b/build-aux/make_toolchain.sh
similarity index 100%
rename from aux/make_toolchain.sh
rename to build-aux/make_toolchain.sh