diff -urN a/makechrootpkg.in b/makechrootpkg.in
--- a/makechrootpkg.in	2013-05-25 15:39:46.000000000 -0500
+++ b/makechrootpkg.in	2013-06-04 16:19:08.453803346 -0500
@@ -48,6 +48,7 @@
 	echo 'Flags:'
 	echo '-h         This help'
 	echo '-c         Clean the chroot before building'
+	echo '-C <dir>   Set pacman cache to pass to arch-nspawn'
 	echo '-u         Update the working copy of the chroot before building'
 	echo '           This is useful for rebuilds without dirtying the pristine'
 	echo '           chroot'
@@ -61,11 +62,12 @@
 	exit 1
 }
 
-while getopts 'hcur:I:l:nT' arg; do
+while getopts 'hcuC:r:I:l:nT' arg; do
 	case "$arg" in
 		h) usage ;;
 		c) clean_first=true ;;
 		u) update_first=true ;;
+		C) cache_dir="$OPTARG" ;;
 		r) passeddir="$OPTARG" ;;
 		I) install_pkgs+=("$OPTARG") ;;
 		l) copy="$OPTARG" ;;
@@ -84,6 +86,10 @@
 [[ ! -d $chrootdir ]] && die "No chroot dir defined, or invalid path '$passeddir'"
 [[ ! -d $chrootdir/root ]] && die "Missing chroot dir root directory. Try using: mkarchroot $chrootdir/root base-devel"
 
+if [ -n "$cache_dir" ]; then
+	cache_dir="-c $cache_dir"
+fi
+
 # Detect chrootdir filesystem type
 chroottype=$(stat -f -c %T "$chrootdir")
 
@@ -346,7 +352,7 @@
 
 download_sources
 
-if arch-nspawn "$copydir" \
+if arch-nspawn $cache_dir "$copydir" \
 	--bind-ro="$PWD:/startdir_host" \
 	--bind-ro="$SRCDEST:/srcdest_host" \
 	/chrootbuild