diff --git a/README.md b/README.md
index 8f7fcd621..49c404943 100644
--- a/README.md
+++ b/README.md
@@ -47,7 +47,7 @@ Though there are many bugs left to fix, we are confident at this point that
 ## Build
 
 To build ksh with a custom configuration of features, edit
-[`src/cmd/ksh93/SHOPT.sh`](/ksh93/ksh/blob/master/src/cmd/ksh93/SHOPT.sh).
+[`src/cmd/ksh93/SHOPT.sh`](https://github.com/ksh93/ksh/blob/master/src/cmd/ksh93/SHOPT.sh).
 
 Then `cd` to the top directory and run:
 ```sh
diff --git a/bin/package b/bin/package
index 743533886..0d57a3bfa 100755
--- a/bin/package
+++ b/bin/package
@@ -1436,7 +1436,11 @@ SHOPT()
 	esac
 }
 ksh_shoptflags=
-. src/cmd/ksh93/SHOPT.sh	# this script calls SHOPT() to set options
+shopt_sh='src/cmd/ksh93/SHOPT.sh'	# this script calls SHOPT() to set options
+if	test -f "$shopt_sh"
+then	. "$shopt_sh"
+else	echo "WARNING: $shopt_sh is missing" >&2
+fi
 case $ksh_shoptflags in
 ?*)	# add the extra flags as an argument to mamake
 	assign="${assign:+$assign }KSH_SHOPTFLAGS=\"\$ksh_shoptflags\"" ;;
diff --git a/src/cmd/INIT/package.sh b/src/cmd/INIT/package.sh
index 1286b0f4d..dfbedb435 100644
--- a/src/cmd/INIT/package.sh
+++ b/src/cmd/INIT/package.sh
@@ -1435,7 +1435,11 @@ SHOPT()
 	esac
 }
 ksh_shoptflags=
-. src/cmd/ksh93/SHOPT.sh	# this script calls SHOPT() to set options
+shopt_sh='src/cmd/ksh93/SHOPT.sh'	# this script calls SHOPT() to set options
+if	test -f "$shopt_sh"
+then	. "$shopt_sh"
+else	echo "WARNING: $shopt_sh is missing" >&2
+fi
 case $ksh_shoptflags in
 ?*)	# add the extra flags as an argument to mamake
 	assign="${assign:+$assign }KSH_SHOPTFLAGS=\"\$ksh_shoptflags\"" ;;