build: fix autosetup warning

diff --git a/auto.def b/auto.def
index 6366bac54b2c8c9b99befe224de1ef4aa6c33764..c66d03d64dcf44584ca48fb530d5eddb2407b8a7 100644 (file)
--- a/auto.def
+++ b/auto.def
@@ -3,7 +3,9 @@
 # Make sure we use /usr as a default prefix on Linux; we can't use $host_
 # variables because this needs to go before the inclusion of the system module.
 if {![catch {exec uname} out] && $out eq {Linux}} {
-  define defaultprefix /usr
+  options-defaults {
+    prefix /usr
+  }
 }
 
 autosetup-require-version 0.6.9