diff --git a/sysa/run.sh b/sysa/run.sh
index 76ddc9e..260430a 100755
--- a/sysa/run.sh
+++ b/sysa/run.sh
@@ -92,10 +92,16 @@ fi
 
 echo "Thank you! All done."
 
+# Clear up some RAM space
+grep '^pkg=' /after.kaem | sed 's/pkg="//' | sed 's/=$//' | while read -r p ; do
+    rm -rf "${SOURCES:?}/${p:?}"
+done
+rm -rf "${SOURCES}/mes"
+
 # Write to bootstrap.cfg
 rm "${SOURCES}/bootstrap.cfg"
 for var in CHROOT FORCE_TIMESTAMPS DISK; do
-    echo "${var}=${!var}" >> "${SOURCES}/bootstrap.cfg"
+    echo "export ${var}=${!var}" >> "${SOURCES}/bootstrap.cfg"
 done
 
 build flex-2.5.11
@@ -233,10 +239,6 @@ build make-3.82
 grep '^build' "${SOURCES}/run.sh" | sed "s/build //" | sed "s/ .*$//" | while read -r p ; do
     rm -rf "${SOURCES:?}/${p:?}"
 done
-grep '^pkg=' /after.kaem | sed 's/pkg="//' | sed 's/=$//' | while read -r p ; do
-    rm -rf "${SOURCES:?}/${p:?}"
-done
-rm -rf "${SOURCES}/mes"
 
 if [ "${CHROOT}" = False ]; then
     build kexec-tools-2.0.22
@@ -250,4 +252,5 @@ fi
 # In chroot mode transition directly into System C.
 SYSC="/sysc"
 cp -R "${PREFIX}" "${SYSC}"
+cp "${SOURCES}/bootstrap.cfg" "${SYSC}/usr/src/"
 exec chroot "${SYSC}" /init
diff --git a/sysb/run.sh b/sysb/run.sh
index 1b30de8..674c3dc 100755
--- a/sysb/run.sh
+++ b/sysb/run.sh
@@ -59,7 +59,7 @@ if [ -z "${DISK}" ] || ! [ -e "/dev/${DISK}" ]; then
     ask_disk
 fi
 
-echo "DISK=${DISK}" >> /usr/src/bootstrap.cfg
+echo "export DISK=${DISK}" >> /usr/src/bootstrap.cfg
 
 # Otherwise, add stuff from sysa to sysb
 echo "Mounting sysc"
diff --git a/sysc/run2.sh b/sysc/run2.sh
index d47e08f..8d5aa40 100755
--- a/sysc/run2.sh
+++ b/sysc/run2.sh
@@ -14,7 +14,7 @@ trap 'env - PATH=${PREFIX}/bin PS1="\w # " bash -i' EXIT
 # shellcheck source=sysglobal/helpers.sh
 . helpers.sh
 # shellcheck source=/dev/null
-. helpers.sh
+. bootstrap.cfg
 
 trap bash EXIT