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-rw-r--r--ext/socket/extconf.rb4
-rw-r--r--ext/socket/sockport.h5
2 files changed, 7 insertions, 2 deletions
diff --git a/ext/socket/extconf.rb b/ext/socket/extconf.rb
index 91ac8f6123..46d5120e2e 100644
--- a/ext/socket/extconf.rb
+++ b/ext/socket/extconf.rb
@@ -2,8 +2,8 @@ require 'mkmf'
$LDFLAGS += " -L/usr/local/lib" if File.directory?("/usr/local/lib")
$CFLAGS += " -Dss_family=__ss_family -Dss_len=__ss_len"
-case PLATFORM
-when /mswin32/
+case RUBY_PLATFORM
+when /mswin32|mingw/
test_func = "WSACleanup"
have_library("wsock32", "WSACleanup")
have_func("closesocket")
diff --git a/ext/socket/sockport.h b/ext/socket/sockport.h
index 1639fcf828..e3750816c6 100644
--- a/ext/socket/sockport.h
+++ b/ext/socket/sockport.h
@@ -40,4 +40,9 @@
# define SET_SIN_LEN(si,len)
#endif
+#ifndef IN_MULTICAST
+# define IN_CLASSD(i) (((long)(i) & 0xf0000000) == 0xe0000000)
+# define IN_MULTICAST(i) IN_CLASSD(i)
+#endif
+
#endif