need subr.sh before we can source it

diff --git a/buildxen.sh b/buildxen.sh
index 97ad23eac910fd3f960f1e864e3ba30b0c65d3eb..84583d7e5544921189de0b40d61c9d42ac2a5c01 100755 (executable)
--- a/buildxen.sh
+++ b/buildxen.sh
@@ -8,6 +8,7 @@ STDJ='-j4'
 
 # the buildxen.sh is not as forgiving as I am
 set -e
+[ ! -f ./buildrump.sh/subr.sh ] && git submodule update --init buildrump.sh
 . ./buildrump.sh/subr.sh
 
 MORELIBS="external/bsd/flex/lib