diff --git a/README.md b/README.md
index ad1c71c..5adca2c 100644
--- a/README.md
+++ b/README.md
@@ -46,14 +46,19 @@ Requrirements:
 * bonnibel
 * ninja
 * clang
+* nasm
 * mtools
 * curl for downloading the toolchain
 
 ### Setting up the cross toolchain
 
-If you have `clang` and `curl` installed, runing the `scripts/build_sysroot_clang.sh`
-script will download and build a nasm/binutils/LLVM toolchain configured for building
-jsix host binaries.
+Running `pb sync` will download and unpack the toolchain into `sysroot`. 
+
+#### Compiling the toolchain yourself
+
+If you have `clang` and `curl` installed, runing the `scripts/build_sysroot.sh`
+script will download and build a LLVM toolchain configured for building jsix
+host binaries.
 
 ### Building and running jsix
 
diff --git a/modules.yaml b/modules.yaml
index 26d3f05..df3d73f 100644
--- a/modules.yaml
+++ b/modules.yaml
@@ -1,13 +1,10 @@
 name: jsix
 templates: scripts/templates
-vars:
-    foo: bar
-    bat: baz
 modules:
     kernel:
+        kind: exe
         output: jsix.elf
         target: host
-        kind: exe
         deps:
             - elf
             - initrd
@@ -132,3 +129,8 @@ modules:
             - src/tests/logger.cpp
             - src/tests/heap_allocator.cpp
             - src/tests/main.cpp
+overlays:
+    - url: https://f000.backblazeb2.com/file/jsix-os/sysroot-llvm8-20190706.tar.bz2
+      path: sysroot
+    - url: https://f000.backblazeb2.com/file/jsix-os/sysroot-j6libc-8cb8ce7.tar.bz2
+      path: sysroot
diff --git a/peru.yaml b/peru.yaml
deleted file mode 100644
index 727c514..0000000
--- a/peru.yaml
+++ /dev/null
@@ -1,13 +0,0 @@
-imports:
-    sysroot: ./sysroot
-    j6libc:  ./sysroot
-
-curl module sysroot:
-    url: https://f000.backblazeb2.com/file/jsix-os/sysroot-llvm8-20190706.tar.bz2
-    unpack: tar
-    export: sysroot/
-
-curl module j6libc:
-    url: https://f000.backblazeb2.com/file/jsix-os/sysroot-j6libc-8cb8ce7.tar.bz2
-    unpack: tar
-    export: sysroot/