This script has the only occurrence of it, and in this line
it defines and exports it.

---
 config-ml.in | 1 -
 1 file changed, 1 deletion(-)

diff --git a/config-ml.in b/config-ml.in
index 47f153350..58c80a35c 100644
--- a/config-ml.in
+++ b/config-ml.in
@@ -493,7 +493,6 @@ multi-do:
          true; \
        else \
          rootpre=`${PWD_COMMAND}`/; export rootpre; \
-         srcrootpre=`cd $(srcdir); ${PWD_COMMAND}`/; export srcrootpre; \
          lib=`echo "$${rootpre}" | sed -e 's,^.*/\([^/][^/]*\)/$$,\1,'`; \
          compiler="$(CC)"; \
          for i in `$${compiler} --print-multi-lib 2>/dev/null`; do \
-- 
2.12.2

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