diff --git a/src/main/scala/ch04/01nativeFork.scala b/src/main/scala/ch04/01nativeFork.scala
index 511dce2..584226f 100644
--- a/src/main/scala/ch04/01nativeFork.scala
+++ b/src/main/scala/ch04/01nativeFork.scala
@@ -1,8 +1,7 @@
-package ch04.nativeFork
+package ch04
+package nativeFork
 
 import scalanative.libc.stdlib
-import ch04.common
-import common.util
 
 @main
 def nativeFork(args: String*): Unit =
@@ -12,9 +11,9 @@ def nativeFork(args: String*): Unit =
 
   println("about to fork")
 
-  val status = common.doAndAwait: () =>
+  val status = doAndAwait: () =>
     println(s"in child, about to exec command: ${args.toSeq}")
-    common.runCommand(args)
+    runCommand(args)
 
   println(s"wait status ${status}")
 
diff --git a/src/main/scala/ch04/02badExec.scala b/src/main/scala/ch04/02badExec.scala
index f211f15..475521b 100644
--- a/src/main/scala/ch04/02badExec.scala
+++ b/src/main/scala/ch04/02badExec.scala
@@ -1,11 +1,10 @@
-package ch04.badExec
-
-import ch04.common
+package ch04
+package badExec
 
 @main
 def badExec(args: String*): Unit =
   println("about to exec")
-  common.runCommand(Seq("/bin/ls", "-l", "."))
+  runCommand(Seq("/bin/ls", "-l", "."))
   println("exec returned, we're done!")
 
 // It is executed inside the .scala-build folder (does not see hidden .bloop folder).
diff --git a/src/main/scala/ch04/03nativePipe.scala b/src/main/scala/ch04/03nativePipe.scala
index e39ca5d..b0ed036 100644
--- a/src/main/scala/ch04/03nativePipe.scala
+++ b/src/main/scala/ch04/03nativePipe.scala
@@ -1,10 +1,9 @@
-package ch04.nativePipe
+package ch04
+package nativePipe
 
 import scalanative.unsafe.stackalloc
 import scalanative.posix.unistd // getpid
 import collection.mutable.ArrayBuffer
-import ch04.common
-import common.util
 
 @main
 def nativePipe(args: String*): Unit =
@@ -31,7 +30,7 @@ def pipeMany(input: Int, output: Int, procs: Seq[Seq[String]]): Int =
   val procsWithFds = procs.lazyZip(inputFds).lazyZip(outputFds)
   val pids =
     for (proc, inputFd, outputFd) <- procsWithFds
-    yield common.doFork: () =>
+    yield doFork: () =>
       // close all pipes that this process won't be using.
       for p <- 0 until 2 * (procs.size - 1) do
         if pipeArray(p) != inputFd && pipeArray(p) != outputFd then
@@ -47,7 +46,7 @@ def pipeMany(input: Int, output: Int, procs: Seq[Seq[String]]): Int =
         unistd.close(unistd.STDOUT_FILENO)
         util.dup2(outputFd, unistd.STDOUT_FILENO)
 
-      common.runCommand(proc)
+      runCommand(proc)
 
   for i <- 0 until 2 * (procs.size - 1) do unistd.close(pipeArray(i))
   unistd.close(input)
diff --git a/src/main/scala/ch04/04nativePipeTwo.scala b/src/main/scala/ch04/04nativePipeTwo.scala
index 45cdbbb..57098cb 100644
--- a/src/main/scala/ch04/04nativePipeTwo.scala
+++ b/src/main/scala/ch04/04nativePipeTwo.scala
@@ -1,10 +1,9 @@
-package ch04.nativePipeTwo
+package ch04
+package nativePipeTwo
 
 import scalanative.unsafe.{stackalloc, CQuote}
 import scalanative.posix.unistd // getpid
-import scalanative.libc.{stdio}
-import ch04.common
-import common.util
+import scalanative.libc.stdio
 
 @main
 def nativePipeTwo(args: String*): Unit =
@@ -22,7 +21,7 @@ def runTwoAndPipe(input: Int, output: Int, proc1: Seq[String], proc2: Seq[String
   val outputPipe = pipeArray(1)
   val inputPipe = pipeArray(0)
 
-  val proc1Pid = common.doFork: () =>
+  val proc1Pid = doFork: () =>
     if input != 0 then
       println(s"proc ${unistd.getpid()}: about to dup ${input} to stdin")
       util.dup2(input, 0)
@@ -30,16 +29,16 @@ def runTwoAndPipe(input: Int, output: Int, proc1: Seq[String], proc2: Seq[String
     println(s"proc 1 about to dup ${outputPipe} to stdout")
     util.dup2(outputPipe, 1)
     stdio.printf(c"process %d about to runCommand\n", unistd.getpid())
-    common.runCommand(proc1)
+    runCommand(proc1)
 
-  val proc2Pid = common.doFork: () =>
+  val proc2Pid = doFork: () =>
     println(s"proc ${unistd.getpid()}: about to dup")
     util.dup2(inputPipe, 0)
     if output != 1 then util.dup2(output, 1)
 
     unistd.close(outputPipe)
     stdio.printf(c"process %d about to runCommand\n", unistd.getpid())
-    common.runCommand(proc2)
+    runCommand(proc2)
 
   unistd.close(input)
   unistd.close(outputPipe)
diff --git a/src/main/scala/ch04/common.scala b/src/main/scala/ch04/common.scala
index 5867944..d1c75cb 100644
--- a/src/main/scala/ch04/common.scala
+++ b/src/main/scala/ch04/common.scala
@@ -1,4 +1,4 @@
-package ch04.common
+package ch04
 
 import scalanative.unsigned.{USize, UnsignedRichInt} // .toUSize
 import scalanative.unsafe.{CQuote, toCString, Ptr, CString}