From 7bede2bf575271f963e7e9049c08c8a564d8f1cb Mon Sep 17 00:00:00 2001
From: Lucio Andrés Illanes Albornoz <lucio@lucioillanes.de>
Date: Apr 06 2021 12:41:37 +0000
Subject: build.sh:build(): workaround bash >=4.4.20 & Zsh inconsistency concerning local uninitialised variables inheriting from the environment (or not.)


---

diff --git a/build.sh b/build.sh
index 26ccd95..ba06c3e 100755
--- a/build.sh
+++ b/build.sh
@@ -117,8 +117,9 @@ build() {
 		BUILD_NFAIL=0 BUILD_NFINI=0 BUILD_NSKIP=0 BUILD_PKGS_FAILED="" BUILD_TARGET="" BUILD_USER=""		\
 		DEFAULT_BUILD_CPUS=1 DEFAULT_BUILD_LAST_FAILED_PKG_FNAME="" DEFAULT_BUILD_LOG_FNAME=""			\
 		DEFAULT_BUILD_STEPS="" DEFAULT_BUILD_VARS="" DEFAULT_CLEAR_PREFIX_PATHS="" DEFAULT_GIT_ARGS=""		\
-		DEFAULT_GITROOT_HEAD DEFAULT_LOG_ENV_VARS="" DEFAULT_MIRRORS="" DEFAULT_TARGET="" DEFAULT_WGET_ARGS=""	\
-		MIDIPIX_BUILD_PWD=""; DEFAULT_BUILD_STATUS_IN_PROGRESS_FNAME=""; EX_PKG_DISPATCH_WAIT="";
+		DEFAULT_GITROOT_HEAD="${DEFAULT_GITROOT_HEAD:-}" DEFAULT_LOG_ENV_VARS="" DEFAULT_MIRRORS=""		\
+		DEFAULT_TARGET="" DEFAULT_WGET_ARGS="" MIDIPIX_BUILD_PWD="";
+	DEFAULT_BUILD_STATUS_IN_PROGRESS_FNAME=""; EX_PKG_DISPATCH_WAIT="";
 	if ! . "${0%/*}/subr/build_init.subr"; then
 		_rc=1; printf "Error: failed to source \`${0%/*}/subr/build_init.subr'." >&2;
 	elif ! build_init "${@}"; then