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-rw-r--r--ext/dbm/extconf.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/dbm/extconf.rb b/ext/dbm/extconf.rb
index 1fc443c280..5a67603e69 100644
--- a/ext/dbm/extconf.rb
+++ b/ext/dbm/extconf.rb
@@ -32,7 +32,7 @@ def db_check(db)
if have_library(db, db_prefix("dbm_open")) || have_func(db_prefix("dbm_open"))
for hdr in $dbm_conf_headers.fetch(db, ["ndbm.h"])
- if have_header(hdr.dup)
+ if have_header(hdr.dup) and have_type("DBM", hdr.dup, hsearch)
$CFLAGS += " " + hsearch + '-DDBM_HDR="<'+hdr+'>"'
return true
end