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-rw-r--r--ares/configure.ac1
1 files changed, 1 insertions, 0 deletions
diff --git a/ares/configure.ac b/ares/configure.ac
index 0165c5e90..78f239f25 100644
--- a/ares/configure.ac
+++ b/ares/configure.ac
@@ -553,6 +553,7 @@ AC_CHECK_MEMBER(struct addrinfo.ai_flags,
AC_CHECK_FUNCS( bitncmp \
+ isblank \
if_indextoname,
dnl if found
[],