diff --git a/CLFS/master.sh b/CLFS/master.sh
index e150f00..6417ff1 100644
--- a/CLFS/master.sh
+++ b/CLFS/master.sh
@@ -378,10 +378,13 @@ boot_Makefiles() {                     #
       *grub | *aboot | *colo | *silo | *arcload | *lilo | *introduction ) continue ;;
       *how-to-view*) continue  ;;
       *whatnext*) continue     ;;
-      *fstab)   [[ ! -z ${FSTAB} ]] && cp ${FSTAB} $BUILDDIR/sources/fstab ;;
+      *fstab)   [[ ! -z ${FSTAB} ]] &&
+                [[ ${FSTAB} == $BUILDDIR/sources/fstab ]] ||
+                cp ${FSTAB} $BUILDDIR/sources/fstab ;;
       *kernel)  # if there is no kernel config file do not build the kernel
-                [[ -z $CONFIG ]] && continue
+                [[ -z $BOOT_CONFIG ]] && continue
                   # Copy the config file to /sources with a standardized name
+                [[ ${BOOT_CONFIG} == $BUILDDIR/sources/bootkernel-config ]] ||
                 cp $BOOT_CONFIG $BUILDDIR/sources/bootkernel-config
           ;;
     esac
@@ -734,7 +737,9 @@ bootscripts_Makefiles() {              #
       *udev)     continue ;; # This is not a script but a commentary, we want udev-rules
       *console*) continue ;; # Use the files that came with the bootscripts
 # fstab is now here (for 3.x.y)
-      *fstab)  [[ ! -z ${FSTAB} ]] && cp ${FSTAB} $BUILDDIR/sources/fstab ;;
+      *fstab)  [[ ! -z ${FSTAB} ]] &&
+               [[ ${FSTAB} == $BUILDDIR/sources/fstab ]] ||
+               cp ${FSTAB} $BUILDDIR/sources/fstab ;;
       *)  ;;
     esac
 
@@ -907,10 +912,13 @@ bootable_Makefiles() {                 #
     # A little housekeeping on the scripts
     case $this_script in
       *grub | *aboot | *colo | *silo | *arcload | *lilo | *reboot* )  continue ;;
-      *fstab)  [[ ! -z ${FSTAB} ]] && cp ${FSTAB} $BUILDDIR/sources/fstab ;;
+      *fstab)  [[ ! -z ${FSTAB} ]] &&
+               [[ ${FSTAB} == $BUILDDIR/sources/fstab ]] ||
+               cp ${FSTAB} $BUILDDIR/sources/fstab ;;
       *kernel) # if there is no kernel config file do not build the kernel
                [[ -z $CONFIG ]] && continue
                  # Copy the config file to /sources with a standardized name
+               [[ $CONFIG == $BUILDDIR/sources/kernel-config ]] ||
                cp $CONFIG $BUILDDIR/sources/kernel-config
         ;;
     esac
diff --git a/LFS/master.sh b/LFS/master.sh
index a742d0e..f80cf57 100644
--- a/LFS/master.sh
+++ b/LFS/master.sh
@@ -312,8 +312,11 @@ chapter78_Makefiles() {
     # If no .config file is supplied, the kernel build is skipped
     case ${this_script} in
       *grub)    continue ;;
-      *fstab)   [[ ! -z ${FSTAB} ]] && cp ${FSTAB} $BUILDDIR/sources/fstab ;;
+      *fstab)   [[ ! -z ${FSTAB} ]] &&
+                [[ ${FSTAB} == $BUILDDIR/sources/fstab ]] ||
+                cp ${FSTAB} $BUILDDIR/sources/fstab ;;
       *kernel)  [[ -z ${CONFIG} ]] && continue
+                [[ ${CONFIG} == $BUILDDIR/sources/kernel-config ]] ||
                 cp ${CONFIG} $BUILDDIR/sources/kernel-config  ;;
     esac
 
diff --git a/common/libs/func_install_blfs b/common/libs/func_install_blfs
index 2b17edc..042a912 100644
--- a/common/libs/func_install_blfs
+++ b/common/libs/func_install_blfs
@@ -146,7 +146,7 @@ pushd $BUILDDIR/sources
 sudo find . -name unpacked -exec rm \{\} \;
 if [ "$GETPKG" = "y" ]; then
     FTP_SERVER=$SERVER/pub/blfs/ \
-    SRC_ARCHIVE=$SRC_ARCHIVE     \
+    SRC_ARCHIVE=${SRC_ARCHIVE:-/dev/null}     \
     $BUILDDIR$BLFS_ROOT/download_script
 else # Save the download script in case the user wants to run it later
     cp $BUILDDIR$BLFS_ROOT/download_script .