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-rw-r--r--ext/etc/extconf.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/etc/extconf.rb b/ext/etc/extconf.rb
index 884de93ec89..a02ff8c0911 100644
--- a/ext/etc/extconf.rb
+++ b/ext/etc/extconf.rb
@@ -1,3 +1,4 @@
+require 'mkmf'
have_library("sun", "getpwnam") # NIS (== YP) interface for IRIX 4
a = have_func("getlogin")
b = have_func("getpwent")