diff --git a/build.sh b/build.sh
index 8cc64b5..26879b1 100755
--- a/build.sh
+++ b/build.sh
@@ -76,9 +76,13 @@ for BUILD_LVL in 0 1 2 3; do
 						PKG_FNAME=${PKG_URL##*/};
 					 	PKG_SUBDIR=${PKG_FNAME%%.tar*};
 					fi;
-					BUILD_DEBUG_TARBALL_FNAME=${PREFIX}/midipix-debug-${BUILD_USER}@${BUILD_HNAME}_$(date %Y-%m-%d-%H-%M-%S).tar.bz2;
-					tar -C ${PREFIX} -cpf - build.log $(cd ${PREFIX} && find ${WORKDIR#${PREFIX}/} -mindepth 1 -maxdepth 1 -type d -iname ${PKG_SUBDIR}-*) |\
-						bzip2 -c - > ${BUILD_DEBUG_TARBALL_FNAME};
+					BUILD_DEBUG_TARBALL_FNAME=${PREFIX}/midipix-debug-${BUILD_USER}@${BUILD_HNAME}_$(date %Y-%m-%d-%H-%M-%S).tar.xz;
+					tar -C ${PREFIX} -cJp				\
+						-f ${BUILD_DEBUG_TARBALL_FNAME}		\
+						build.log $(cd ${PREFIX} &&		\
+							find ${WORKDIR#${PREFIX}/}	\
+								-mindepth 1 -maxdepth 1	\
+								-type d -iname ${PKG_SUBDIR}-*);
 					log_msg info "Please upload ${BUILD_DEBUG_TARBALL_FNAME} and provide an URL to it in <irc://irc.freenode.net/midipix>.";
 				fi;
 				: $((BUILD_NFAIL+=1)); break; ;;
@@ -105,10 +109,10 @@ if [ $(( ${BUILD_NFINI} + ${BUILD_NSKIP} )) -ge 0 ]					\
 	 	-exec sh -c 'DEST=$(readlink -- "${0}") &&				\
 			rm -f -- "${0}" && ln -- "${DEST}" "${0}"' {} \;); wait;
 	 log_msg info "Converted symbolic links in ${PREFIX_BASENAME}/lib to hard links.";
-	 tar -cpf - $(find .								\
-		-mindepth 1 -maxdepth 1 -type d						\
-		$(echo ${TARBALL_EXCLUDE_PATHS} lib | sed 's/\(^\| \)/ -not -path /g'))	|\
-	 bzip2 -9c - > ${TARBALL_FNAME_PREFIX}${BUILD_USER}@${BUILD_HNAME}-${BUILD_DATE_START}${TARBALL_FNAME_SUFFIX};
+	TARBALL_FNAME=${TARBALL_FNAME_PREFIX}${BUILD_USER}@${BUILD_HNAME}-${BUILD_DATE_START}.tar.xz;
+	tar -cJpf ${TARBALL_FNAME}							\
+		$(find_with_no_paths "${TARBALL_EXCLUDE_PATHS} native/lib.bak" .	\
+			-mindepth 1 -maxdepth 2 -type d);
 	 rm -rf ${PREFIX_BASENAME}/lib; mv ${PREFIX_BASENAME}/lib.bak ${PREFIX_BASENAME}/lib);
 	wait; log_msg info "Finished building distribution tarball.";
 	update_build_status tarball_finish;
diff --git a/build.subr b/build.subr
index 9899240..4856077 100644
--- a/build.subr
+++ b/build.subr
@@ -58,11 +58,20 @@ export_vars_subst() {
 };
 
 fetch_git() {
-	rm_if_exists ${1};
+	[ ${ARG_NO_DOWNLOAD:-0} -eq 0 ] &&\
+		rm_if_exists ${1};
 	[ -d ${1} ] && (cd ${1} && git pull origin main)\
 		|| git clone ${3} ${2} ${1};
 };
 
+find_with_no_paths() {
+	for _fwnp_not_path in ${1}; do
+		_fwnp_args="${_fwnp_args:+${_fwnp_args} }-not -path ./${_fwnp_not_path} -not -path ./${_fwnp_not_path}/*";
+	done; shift;
+	set -f; find "${@}" ${_fwnp_args}; _rc=${?}; set +f;
+	unset _fwnp_args _fwnp_not_path; return ${_rc};
+};
+
 rm_if_exists() {
 	[ -z "${1#-m}" ] && { _rie_arg_m=1; shift; };
 	[ -z "${1#-c}" ] && { _rie_arg_c=1; shift; };
diff --git a/build.vars b/build.vars
index 45e72bd..712e8b9 100644
--- a/build.vars
+++ b/build.vars
@@ -14,7 +14,7 @@
 : ${BUILD_STATUS_FINISHED_AT_CURRENT_FNAME:=${PREFIX}/BUILD_FINISHED_AT};
 : ${BUILD_STATUS_IN_PROGRESS_FNAME:=${PREFIX}/BUILD_IN_PROGRESS};
 : ${CFLAGS_DEFAULT:=-g3 -O0};
-: ${CHECK_PREREQ_CMDS:="bzip2 flex git make mktemp openssl patch pkg-config sed sort tar tee tr wget"};
+: ${CHECK_PREREQ_CMDS:="bunzip2 flex git gunzip make mktemp openssl patch pkg-config sed sort tar tee tr wget xz"};
 : ${CHECK_PATH_VARS:="PREFIX PREFIX_NATIVE WORKDIR"};
 : ${CLEAR_ENV_VARS_EXCEPT:="HOME PATH SHELL TERM USER"};
 : ${GITROOT:=git://midipix.org};
@@ -26,7 +26,6 @@
 : ${LOG_MSG_SUCC_COLOUR:=92};
 : ${MAKEFLAGS_DEFAULT:=-j8};
 : ${TARBALL_FNAME_PREFIX:=midipix.};
-: ${TARBALL_FNAME_SUFFIX:=.tar.bz2};
 : ${TARBALL_EXCLUDE_PATHS:="src tmp"};
 : ${TARGET:=x86_64-nt64-midipix};
 : ${PREFIX_NATIVE:=${PREFIX}/native};