diff --git a/subr/build_init.subr b/subr/build_init.subr
index 8b3e618..3ae592e 100644
--- a/subr/build_init.subr
+++ b/subr/build_init.subr
@@ -49,8 +49,10 @@ build_init() {
 		touch "${DEFAULT_BUILD_STATUS_IN_PROGRESS_FNAME}";
 	fi;
 	if [ -e "${DEFAULT_BUILD_LOG_FNAME}" ]; then
-		mv -- "${DEFAULT_BUILD_LOG_FNAME} ${DEFAULT_BUILD_LOG_LAST_FNAME}";
+		ex_rtl_fileop mv "${DEFAULT_BUILD_LOG_FNAME} ${DEFAULT_BUILD_LOG_LAST_FNAME}";
 	fi;
+	ex_rtl_fileop touch "${DEFAULT_BUILD_LOG_FNAME}";
+	BUILD_IS_PARENT=1;
 	BUILD_DATE_START="$(ex_rtl_date %Y-%m-%d-%H-%M-%S)";
 	BUILD_NFINI="${BUILD_NSKIP:=${BUILD_NFAIL:=${BUILD_NBUILT:=0}}}";
 	BUILD_TIMES_SECS="$(ex_rtl_date %s)";
diff --git a/subr/ex_pkg_dispatch.subr b/subr/ex_pkg_dispatch.subr
index 92890ba..771b2af 100644
--- a/subr/ex_pkg_dispatch.subr
+++ b/subr/ex_pkg_dispatch.subr
@@ -19,7 +19,7 @@ exp_pkg_dispatch() {
 	else
 		_stderrout_path="${BUILD_WORKDIR}/${_pkg_name}_stderrout.log";
 		"${_dispatch_fn}" start_pkg "${_pkg_name}" "${_tgt_name}";
-		(set -o errexit -o noglob;
+		(set -o errexit -o noglob; BUILD_IS_PARENT=0;
 		ex_pkg_env "${_pkg_name}" "${_tgt_name}" "${_restart_at}";
 		trap "if [ \${?} -eq 0 ]; then							\
 			echo \"done ${_pkg_name} ${_tgt_name}\" >&3;				\
diff --git a/subr/ex_rtl_log.subr b/subr/ex_rtl_log.subr
index 45dbc8d..05653c7 100644
--- a/subr/ex_rtl_log.subr
+++ b/subr/ex_rtl_log.subr
@@ -2,6 +2,14 @@
 # set -o noglob is assumed.
 #
 
+exp_rtl_log_printf() {
+	local _attrs="${1}" _msg; shift; _msg="$(printf "${@}")";
+	if [ "${BUILD_IS_PARENT:-0}" -eq 1 ]; then
+		printf "%s\n" "${_msg}" >> "${DEFAULT_BUILD_LOG_FNAME}";
+	fi;
+	printf "\033[0m\033[${_attr}m%s\033[0m\n" "${_msg}";
+};
+
 ex_rtl_log_env_vars() {
 	local _nvar=1 _arg _arg_len_max=0;
 	ex_rtl_log_msg info "Variables for this ${1:-build}:"; shift;
@@ -25,7 +33,7 @@ ex_rtl_log_set_vnfo_lvl() {
 };
 
 ex_rtl_log_msg() {
-	local _lvl="${1}"; shift;
+	local _lvl="${1}" _attr; shift;
 	if [ "${_lvl}" = vnfo ]\
 	|| [ "${_lvl}" = vucc ]\
 	&& [ "${EXP_RTL_LOG_VNFO_LVL:-0}" -lt 1 ]; then
@@ -38,22 +46,27 @@ ex_rtl_log_msg() {
 		return;
 	fi;
 	case "${_lvl}" in
-		failexit) printf "\033[0m\033[${DEFAULT_LOG_MSG_FAIL_COLOUR}m"; ;;
-		fail) printf "\033[0m\033[${DEFAULT_LOG_MSG_FAIL_COLOUR}m"; ;;
-		info) printf "\033[0m\033[${DEFAULT_LOG_MSG_INFO_COLOUR}m"; ;;
-		inf2) printf "\033[0m\033[${DEFAULT_LOG_MSG_INF2_COLOUR}m"; ;;
-		vnfo) printf "\033[0m\033[${DEFAULT_LOG_MSG_VNFO_COLOUR}m"; ;;
-		vvfo) printf "\033[0m\033[${DEFAULT_LOG_MSG_VVFO_COLOUR}m"; ;;
-		vvvo) printf "\033[0m\033[${DEFAULT_LOG_MSG_VVVO_COLOUR}m"; ;;
-		succ) printf "\033[0m\033[${DEFAULT_LOG_MSG_SUCC_COLOUR}m"; ;;
-		suc2) printf "\033[0m\033[${DEFAULT_LOG_MSG_SUC2_COLOUR}m"; ;;
-		vucc) printf "\033[0m\033[${DEFAULT_LOG_MSG_VUCC_COLOUR}m"; ;;
+		failexit) _attr="${DEFAULT_LOG_MSG_FAIL_COLOUR}"; ;;
+		fail) _attr="${DEFAULT_LOG_MSG_FAIL_COLOUR}"; ;;
+		info) _attr="${DEFAULT_LOG_MSG_INFO_COLOUR}"; ;;
+		inf2) _attr="${DEFAULT_LOG_MSG_INF2_COLOUR}"; ;;
+		vnfo) _attr="${DEFAULT_LOG_MSG_VNFO_COLOUR}"; ;;
+		vvfo) _attr="${DEFAULT_LOG_MSG_VVFO_COLOUR}"; ;;
+		vvvo) _attr="${DEFAULT_LOG_MSG_VVVO_COLOUR}"; ;;
+		succ) _attr="${DEFAULT_LOG_MSG_SUCC_COLOUR}"; ;;
+		suc2) _attr="${DEFAULT_LOG_MSG_SUC2_COLOUR}"; ;;
+		vucc) _attr="${DEFAULT_LOG_MSG_VUCC_COLOUR}"; ;;
 	esac;
 	if [ ${#} -gt 1 ]; then
-		printf "==> %s %s %s\033[0m\n" "$(ex_rtl_date)" "${1}" "$*";
+		exp_rtl_log_printf "${_attrs}" "==> %s %s %s" "$(ex_rtl_date)" "${1}" "$*";
 	else
-		printf "==> %s %s\033[0m\n" "$(ex_rtl_date)" "${1}";
-	fi; [ ${_lvl} = failexit ] && exit 1 || return 0;
+		exp_rtl_log_printf "${_attrs}" "==> %s %s" "$(ex_rtl_date)" "${1}";
+	fi;
+	if [ ${_lvl} = failexit ]; then
+		exit 1;
+	else
+		return 0;
+	fi;
 };
 
 # vim:filetype=sh