list external dependencies

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diff --git a/README.md b/README.md
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 # packer
 The rustkrazy image generator.
+
+# System package requirements
+For the packer to work you need to install the following packages:
+
+* nasm
+* squashfs-tools-ng
+
+Then, add the musl target:
+
+`rustup target add x86_64-unknown-linux-musl`