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-rw-r--r--ext/dbm/extconf.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/dbm/extconf.rb b/ext/dbm/extconf.rb
index 595640737d4..38a0efbf195 100644
--- a/ext/dbm/extconf.rb
+++ b/ext/dbm/extconf.rb
@@ -1,3 +1,4 @@
+require 'mkmf'
$LDFLAGS = "-L/usr/local/lib"
have_library("gdbm", "dbm_open") or have_library("dbm", "dbm_open")
if have_func("dbm_open")