diff --git a/ixwebsocket/IXNetSystem.cpp b/ixwebsocket/IXNetSystem.cpp
index 7b2a8541..c8bb7b17 100644
--- a/ixwebsocket/IXNetSystem.cpp
+++ b/ixwebsocket/IXNetSystem.cpp
@@ -8,6 +8,12 @@
 #include <cstdint>
 #include <cstdio>
 #ifdef _WIN32
+#ifndef EAFNOSUPPORT
+  #define EAFNOSUPPORT 102
+#endif
+#ifndef ENOSPC
+  #define ENOSPC 28
+#endif
 #include <vector>
 #endif
 
diff --git a/ixwebsocket/IXSocket.h b/ixwebsocket/IXSocket.h
index 1f4272d2..d1fa9691 100644
--- a/ixwebsocket/IXSocket.h
+++ b/ixwebsocket/IXSocket.h
@@ -14,8 +14,10 @@
 
 #ifdef _WIN32
 #include <basetsd.h>
+#ifdef _MSC_VER
 typedef SSIZE_T ssize_t;
 #endif
+#endif
 
 #include "IXCancellationRequest.h"
 #include "IXProgressCallback.h"
diff --git a/ixwebsocket/IXUdpSocket.h b/ixwebsocket/IXUdpSocket.h
index 35f8fec4..9f54daf9 100644
--- a/ixwebsocket/IXUdpSocket.h
+++ b/ixwebsocket/IXUdpSocket.h
@@ -12,8 +12,10 @@
 
 #ifdef _WIN32
 #include <basetsd.h>
+#ifdef _MSC_VER
 typedef SSIZE_T ssize_t;
 #endif
+#endif
 
 #include "IXNetSystem.h"