diff -ur zeromq-3.2.2.orig/src/err.hpp zeromq-3.2.2/src/err.hpp
--- zeromq-3.2.2.orig/src/err.hpp	2012-10-25 02:30:40.000000000 -0600
+++ zeromq-3.2.2/src/err.hpp	2013-01-21 10:56:25.095010874 -0700
@@ -152,4 +152,10 @@
 
 #endif
 
+// Conditionally check for EPROTO; some platforms (OpenBSD) don't support it.
+#ifdef EPROTO
+#define OR_ERRNO_EQ_EPROTO || errno == EPROTO
+#else
+#define OR_ERRNO_EQ_EPROTO
+#endif
 
diff -ur zeromq-3.2.2.orig/src/ipc_listener.cpp zeromq-3.2.2/src/ipc_listener.cpp
--- zeromq-3.2.2.orig/src/ipc_listener.cpp	2012-11-23 00:54:28.000000000 -0700
+++ zeromq-3.2.2/src/ipc_listener.cpp	2013-01-21 10:57:02.670355121 -0700
@@ -196,7 +196,7 @@
     fd_t sock = ::accept (s, NULL, NULL);
     if (sock == -1) {
         errno_assert (errno == EAGAIN || errno == EWOULDBLOCK ||
-            errno == EINTR || errno == ECONNABORTED || errno == EPROTO ||
+            errno == EINTR || errno == ECONNABORTED OR_ERRNO_EQ_EPROTO ||
             errno == ENFILE);
         return retired_fd;
     }
diff -ur zeromq-3.2.2.orig/src/tcp_listener.cpp zeromq-3.2.2/src/tcp_listener.cpp
--- zeromq-3.2.2.orig/src/tcp_listener.cpp	2012-11-23 00:54:28.000000000 -0700
+++ zeromq-3.2.2/src/tcp_listener.cpp	2013-01-21 10:56:48.884173113 -0700
@@ -262,7 +262,7 @@
 #else
     if (sock == -1) {
         errno_assert (errno == EAGAIN || errno == EWOULDBLOCK ||
-            errno == EINTR || errno == ECONNABORTED || errno == EPROTO ||
+            errno == EINTR || errno == ECONNABORTED OR_ERRNO_EQ_EPROTO ||
             errno == ENOBUFS || errno == ENOMEM || errno == EMFILE ||
             errno == ENFILE);
         return retired_fd;