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-rw-r--r--ext/io/nonblock/extconf.rb8
1 files changed, 8 insertions, 0 deletions
diff --git a/ext/io/nonblock/extconf.rb b/ext/io/nonblock/extconf.rb
new file mode 100644
index 0000000000..aecdc16cea
--- /dev/null
+++ b/ext/io/nonblock/extconf.rb
@@ -0,0 +1,8 @@
+require 'mkmf'
+target = "io/nonblock"
+
+hdr = %w"fcntl.h"
+if have_macro("O_NONBLOCK", hdr) and
+ (have_macro("F_GETFL", hdr) or have_macro("F_SETFL", hdr))
+ create_makefile(target)
+end