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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 3a96cee12f..c499df97ad 100644
--- a/ext/dbm/extconf.rb
+++ b/ext/dbm/extconf.rb
@@ -3,7 +3,7 @@ $LDFLAGS = "-L/usr/local/lib"
have_library("gdbm", "dbm_open") or
have_library("db", "dbm_open") or
have_library("dbm", "dbm_open")
-if have_func("dbm_open")
+if have_header("ndbm.h") and have_func("dbm_open")
have_func("dbm_clearerr")
create_makefile("dbm")
end