--- a/arch-detect.patch
+++ b/arch-detect.patch
@@ -5,7 +5,7 @@
  elif [ -e $DEBOOTSTRAP_DIR/arch ]; then
  	HOST_ARCH=`cat $DEBOOTSTRAP_DIR/arch`
 +elif in_path pacman; then
-+	CARCH="$(. /etc/makepkg.conf && echo $CARCH)"
++	CARCH="$(bash -c '. /etc/makepkg.conf && echo $CARCH')"
 +    case "$CARCH" in
 +        "i686")   HOST_ARCH="i386" ;;
 +        "x86_64") HOST_ARCH="amd64" ;;