Index: Setup/verify.eagle
==================================================================
--- Setup/verify.eagle
+++ Setup/verify.eagle
@@ -22,10 +22,14 @@
   exit 1
 }
 
 proc getSha1Hashes { varName } {
   variable fossil
+
+  if {![file exists $fossil]} then {
+    usage [appendArgs "tool \"" $fossil "\" is missing"]
+  }
 
   upvar 1 $varName hashes
 
   set data [exec -success Success -nocarriagereturns -- \
       $fossil artifact current]
@@ -47,10 +51,14 @@
   return $result
 }
 
 proc getSha1Sum { fileName } {
   variable fossil
+
+  if {![file exists $fossil]} then {
+    usage [appendArgs "tool \"" $fossil "\" is missing"]
+  }
 
   return [string range [exec -success Success -nocarriagereturns \
       -trimall -- $fossil sha1sum $fileName] 0 39]
 }