Index: build.sh
==================================================================
--- build.sh
+++ build.sh
@@ -1,8 +1,8 @@
 #!/usr/bin/env bash
 export to=${to:-out}
-. global/common.sh
+source global/common.sh
 
 if test "$os$arch$bits" = ""; then
 	say "set the following environment variables to the appropriate atoms describing your system. for help determining the appropriate atoms, see libk.md"
 	say ' - $os={lin|fbsd|hai|osx…}'
 	say ' - $arch={x86|arm|ia64|mips…}'

Index: clean.sh
==================================================================
--- clean.sh
+++ clean.sh
@@ -1,9 +1,9 @@
 #!/usr/bin/env bash
 to=${to:-out}
 gen=${gen:-gen}
-. global/common.sh
+source global/common.sh
 
 say "cleaning libk build artifacts"
 
 report rm -r $to
 report rm -r $gen

Index: global/build-id.sh
==================================================================
--- global/build-id.sh
+++ global/build-id.sh
@@ -1,7 +1,7 @@
-#!/usr/bin/env sh
-. global/common.sh
+#!/usr/bin/env bash
+source global/common.sh
 
 origin=1566169297
 now=$(date +%s)
 delta=$(expr $now - $origin)
 

Index: global/build-manpage.sh
==================================================================
--- global/build-manpage.sh
+++ global/build-manpage.sh
@@ -1,12 +1,12 @@
-#!/usr/bin/env sh
+#!/usr/bin/env bash
 (test -d global && test -f build.sh) || {
 	echo >&2 "($0) run $me from root of libk source directory"
 	exit 1
 }
 
-. global/common.sh
+source global/common.sh
 reqpack cmark "generate documentation"
 check gen "a directory for generated build dependencies"
 
 file="$1"
 filename="$(basename "$file")"

Index: install.sh
==================================================================
--- install.sh
+++ install.sh
@@ -1,4 +1,4 @@
 #!/usr/bin/env bash
-. global/common.sh
+source global/common.sh
 
 say "this component of the build system does not yet exist"