diff --git a/rpm/kernel-subpackage-build b/rpm/kernel-subpackage-build
index a9c810f..ede3da3 100644
--- a/rpm/kernel-subpackage-build
+++ b/rpm/kernel-subpackage-build
@@ -8,7 +8,7 @@ package_nvr=$3
 
 
 set -o pipefail
-install -d -m 0755 %{buildroot}/boot
+install -d -m 0755 $RPM_BUILD_ROOT/boot
 
 $scriptdir/splitflist $kernel_package_name kernel.flist kernel-ghost.flist
 echo Ghost files:
@@ -33,11 +33,11 @@ $scriptdir/moddep modules.dep request-modules modules
 $scriptdir/modflist kernel.flist modules modules.flist /lib/modules/$KREL/modules.builtin
 grep -v "^$USR/lib/modules/$KREL\\(\$\\|/kernel\\)" < kernel.flist >> modules.flist || :
 
-tar -C / -cf- -T modules.flist | tar -C %{buildroot} -xvf-
+tar -C / -cf- -T modules.flist | tar -C $RPM_BUILD_ROOT -xvf-
 
-[ -z "$USR" ] || ln -s usr/lib %{buildroot}/lib
-moderr="$(/usr/sbin/depmod -b %{buildroot} -e -F /boot/System.map-$KREL $KREL 2>&1 > /dev/null)"
-[ -z "$USR" ] || rm %{buildroot}/lib
+[ -z "$USR" ] || ln -s usr/lib $RPM_BUILD_ROOT/lib
+moderr="$(/usr/sbin/depmod -b $RPM_BUILD_ROOT -e -F /boot/System.map-$KREL $KREL 2>&1 > /dev/null)"
+[ -z "$USR" ] || rm $RPM_BUILD_ROOT/lib
 
 if [ "$moderr" ] ; then
 echo Picked modules have errors:
@@ -59,14 +59,14 @@ while read name mode size mtime link; do
   p="${mode:0-4:4}"
   (( p != 0 )) || p=''
   if (( t == 0100000 )); then
-    install -D -m "${p:-0644}" /dev/null "%{buildroot}$name"
-    dd if=/dev/null bs=1 count=0 status=none seek="$size" of="%{buildroot}$name"
-    touch -h --date="@$mtime" "%{buildroot}$name"
+    install -D -m "${p:-0644}" /dev/null "$RPM_BUILD_ROOT$name"
+    dd if=/dev/null bs=1 count=0 status=none seek="$size" of="$RPM_BUILD_ROOT$name"
+    touch -h --date="@$mtime" "$RPM_BUILD_ROOT$name"
   elif (( t == 0040000 )); then
-    install -d -m "${p:-0755}" "%{buildroot}$name"
-    touch -h -date="@$mtime" "%{buildroot}$name"
+    install -d -m "${p:-0755}" "$RPM_BUILD_ROOT$name"
+    touch -h -date="@$mtime" "$RPM_BUILD_ROOT$name"
   elif (( t == 0120000 )); then
-    ln -s "$link" "%{buildroot}$name"
-    touch -h --date="@$mtime" "%{buildroot}$name"
+    ln -s "$link" "$RPM_BUILD_ROOT$name"
+    touch -h --date="@$mtime" "$RPM_BUILD_ROOT$name"
   fi
 done < kernel-ghost.flist