build-package: further fixes for Darwin/*BSD compat

build-package

@@ -10,8 +10,14 @@ CWD=$(readlink -n "${BASH_SOURCE[0]}")
 CWD=$(dirname "${CWD}")
 
 case $(uname -s) in
-	*Darwin*) export sumsha256="shasum -a 256" ;;
-	* )	  export sumsha256="sha256sum" ;;
+	*Darwin* | *BSD* )
+		export sumsha256="shasum -a 256"
+		export statx="stat -f %Z"
+	;;
+	*Linux* )
+		export sumsha256="sha256sum"
+		export statx="stat -c %Z"
+	;;
 esac
 
 # DIRS

data/build-package.download

@@ -58,7 +58,7 @@ index_update_required () {
 	index_file=${1}
 
 	test ! -f ${index_file} && return 0
-	test $(stat --format=%Z ${index_file}) -le $(($(date +%s) - 3600)) && return 0
+	test $(${statx} ${index_file}) -le $(($(date +%s) - 3600)) && return 0
 	test "$(file -b ${index_file})" == "empty" && return 0
 
 	return 1