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-rw-r--r--ext/socket/extconf.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/socket/extconf.rb b/ext/socket/extconf.rb
index bbda95cf83f..80bd74338c2 100644
--- a/ext/socket/extconf.rb
+++ b/ext/socket/extconf.rb
@@ -1,3 +1,4 @@
+require 'mkmf'
$LDFLAGS = "-L/usr/local/lib"
case PLATFORM
when /mswin32/