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diff --git a/depgraphs/Build-Depends_system_simplified.dot b/depgraphs/Build-Depends_system_simplified.dot
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+/*
+ * Build-Depends_system_simplified.dot
+ * This is a high-level view of build dependencies between system packages.
+ * It is a graph of "Build-Depends" fields, showing dependencies on source
+ * package names rather than binary package names (e.g. "gcc" build-depends on
+ * "mpfr" rather than "libmpfr.4").
+ */
+
+digraph "Build-Depends_system_simplified" {
+	subgraph "Toolchain" {
+		"gcc" -> "gmp"
+		"gcc" -> "mpfr"
+		"gcc" -> "mpc"
+		"gcc" -> "binutils"
+		"gcc" -> "gcc"
+		"gcc" -> "make"
+		"mpfr" -> "gmp"
+		"mpfr" -> "make"
+		"mpfr" -> "gcc"
+		"mpfr" -> "binutils"
+		"mpc" -> "mpfr"
+		"mpc" -> "gmp"
+		"mpc" -> "make"
+		"mpc" -> "gcc"
+		"mpc" -> "binutils"
+		"gmp" -> "make"
+		"gmp" -> "gcc"
+		"gmp" -> "binutils"
+		"make" -> "make"
+		"make" -> "gcc"
+		"make" -> "binutils"
+		"binutils" -> "make"
+		"binutils" -> "gcc"
+		"binutils" -> "binutils"
+	}
+	subgraph "System" {
+		"busybox" -> "config-<platform>"
+		"busybox" -> "gcc"
+		"busybox" -> "make"
+		"busybox" -> "binutils"
+		"linux" -> "config-<platform>"
+		"linux" -> "make"
+		"linux" -> "gcc"
+		"binutils" -> "binutils"
+		"basefiles-<platform>"
+	}
+	subgraph "Package" {
+		"opkg" -> "gcc"
+		"opkg" -> "make"
+		"opkg" -> "binutils"
+		"fakeroot" -> "gcc"
+		"fakeroot" -> "make"
+		"fakeroot" -> "binutils"
+		"opkhelper"
+		"opkhelper-buildflags"
+	}
+}