check $GOROOT before diving into build

R=r
DELTA=6  (6 added, 0 deleted, 0 changed)
OCL=16726
CL=16726

diff --git a/src/make.bash b/src/make.bash
index 3ff193145e757897d7bb76af811546e7004df664..df70e41f4892149bdd55886265586bedc884e5e4 100755 (executable)
--- a/src/make.bash
+++ b/src/make.bash
@@ -6,6 +6,12 @@
 set -e
 export MAKEFLAGS=-j4
 
+if ! test -f $GOROOT/include/u.h
+then
+       echo '$GOROOT is not set correctly or not exported' 1>&2
+       exit 1
+fi
+
 bash clean.bash
 
 for i in lib9 libbio libmach_amd64 libregexp cmd runtime lib