2 files changed, 2 insertions, 1 deletions

diff --git a/control b/control
index b080f4e..5dea986 100644
--- a/control
+++ b/control
@@ -1,3 +1,3 @@
 Maintainer: "P. J. McDermott" <pjm@nac.net>
-Build-Depends: opkhelper-3.0, libtcl8.6-dev
+Build-Depends: opkhelper-3.0, libtcl${Tcl-Version}-dev
 Homepage: http://expect.nist.gov/
diff --git a/substvars b/substvars
new file mode 100644
index 0000000..7be0192
--- /dev/null
+++ b/substvars
@@ -0,0 +1 @@
+Tcl-Version: 8.6