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-rw-r--r--ext/unicorn_http/extconf.rb3
1 files changed, 2 insertions, 1 deletions
diff --git a/ext/unicorn_http/extconf.rb b/ext/unicorn_http/extconf.rb
index 39bd510..2435925 100644
--- a/ext/unicorn_http/extconf.rb
+++ b/ext/unicorn_http/extconf.rb
@@ -1,6 +1,7 @@
 require 'mkmf'
 
 dir_config("unicorn_http")
-check_sizeof("off_t", "sys/types.h")
+
+have_macro("SIZEOF_OFF_T", "ruby.h") or check_sizeof("off_t", "sys/types.h")
 have_func("rb_str_set_len", "ruby.h")
 create_makefile("unicorn_http")