diff --git a/bin/build.sh b/bin/build.sh
index e0274baa1cff979f22b2497f004dc01c49d10d50..3b525567be77e591948881b1e50644a2d7592ece 100755
--- a/bin/build.sh
+++ b/bin/build.sh
@@ -39,7 +39,7 @@ ENABLE2="yes"
 ENABLE3="yes"
 ENABLE4="yes"
 
-version=20d
+version=20e
 SRCDIR=src
 BINDIR=bin
 TOOLDIR=$BINDIR
diff --git a/src/bootfiles/20e/boot-2014-05-1.lisp b/src/bootfiles/20e/boot-2014-05-1.lisp
new file mode 100644
index 0000000000000000000000000000000000000000..91c72d65124b95e7f27d128e33d988e587953b69
--- /dev/null
+++ b/src/bootfiles/20e/boot-2014-05-1.lisp
@@ -0,0 +1,5 @@
+;; Remove the UNIX package from the package use list of the VM
+;; package.  The UNIX package is only needed to provide the SIGCONTEXT
+;; symbol, so we just prefix it everywhere.
+
+(unuse-package "UNIX" "VM")