diff --git a/pvAccessApp/remote/blockingTCPTransport.cpp b/pvAccessApp/remote/blockingTCPTransport.cpp
index ec98559..6fe46cd 100644
--- a/pvAccessApp/remote/blockingTCPTransport.cpp
+++ b/pvAccessApp/remote/blockingTCPTransport.cpp
@@ -30,10 +30,6 @@
 typedef SSIZE_T ssize_t;
 #endif
 
-#ifdef __vxworks
-#define INT64_MAX (0x7fffffffffffffffLL)
-#endif
-
 using namespace epics::pvData;
 
 using std::max;
diff --git a/pvAccessApp/remote/blockingUDPTransport.cpp b/pvAccessApp/remote/blockingUDPTransport.cpp
index dcc5828..24d2f57 100644
--- a/pvAccessApp/remote/blockingUDPTransport.cpp
+++ b/pvAccessApp/remote/blockingUDPTransport.cpp
@@ -26,6 +26,13 @@ using namespace std;
 namespace epics {
     namespace pvAccess {
 
+#ifdef __vxworks
+inline int sendto(int s, const char *buf, size_t len, int flags, const struct sockaddr *to, int tolen)
+{
+    return ::sendto(s, const_cast<char*>(buf), len, flags, const_cast<struct sockaddr *>(to), tolen);
+}
+#endif
+
         PVACCESS_REFCOUNT_MONITOR_DEFINE(blockingUDPTransport);
 
         BlockingUDPTransport::BlockingUDPTransport(
@@ -295,17 +302,8 @@ namespace epics {
         bool BlockingUDPTransport::send(ByteBuffer* buffer, const osiSockAddr& address) {
 
             buffer->flip();
-            int retval = sendto(_channel,
-#ifdef __vxworks
-            		(char *)
-#endif
-            		buffer->getArray(),
-                    buffer->getLimit(), 0,
-#ifdef __vxworks
-                    (sockaddr*)
-#endif
-                    &(address.sa), sizeof(sockaddr));
-
+            int retval = sendto(_channel, buffer->getArray(),
+                    buffer->getLimit(), 0, &(address.sa), sizeof(sockaddr));
             if(unlikely(retval<0))
             {
                 char errStr[64];
@@ -324,16 +322,8 @@ namespace epics {
 
             bool allOK = true;
             for(size_t i = 0; i<_sendAddresses->size(); i++) {
-                int retval = sendto(_channel,
-#ifdef __vxworks
-                		(char *)
-#endif
-                		buffer->getArray(),
-                        buffer->getLimit(), 0,
-#ifdef __vxworks
-                        (sockaddr*)
-#endif
-                        &((*_sendAddresses)[i].sa),
+                int retval = sendto(_channel, buffer->getArray(),
+                        buffer->getLimit(), 0, &((*_sendAddresses)[i].sa),
                         sizeof(sockaddr));
                 if(unlikely(retval<0))
                 {
diff --git a/pvAccessApp/remote/channelSearchManager.h b/pvAccessApp/remote/channelSearchManager.h
index 066fa2a..d90c554 100644
--- a/pvAccessApp/remote/channelSearchManager.h
+++ b/pvAccessApp/remote/channelSearchManager.h
@@ -10,11 +10,6 @@
 #include <pv/remote.h>
 #include <osiSock.h>
 
-#ifndef __vxworks
-/* why not use pvType.h here? */
-#include <stdint.h>
-#endif
-
 namespace epics {
 namespace pvAccess {
 
diff --git a/pvAccessApp/rpcService/rpcServer.cpp b/pvAccessApp/rpcService/rpcServer.cpp
index c6f6a0c..cafce36 100644
--- a/pvAccessApp/rpcService/rpcServer.cpp
+++ b/pvAccessApp/rpcService/rpcServer.cpp
@@ -6,8 +6,17 @@
 
 #include <stdexcept>
 #include <rpcServer.h>
+
 #ifdef __vxworks
 #include <envLib.h>
+using std::string;
+inline int setenv(const char *name, const char *value, int overwrite)
+{
+    string e(name);
+    e += "=";
+    e += value;
+    return putenv(const_cast<char*>(e.c_str()));
+}
 #endif
 
 using namespace epics::pvData;
@@ -403,11 +412,7 @@ RPCServer::RPCServer()
     m_channelProviderImpl.reset(new RPCChannelProvider());
     registerChannelProvider(m_channelProviderImpl);
 
-#ifdef __vxworks
-    putenv(const_cast<char*>(("EPICS4_CAS_PROVIDER_NAMES=" + m_channelProviderImpl->getProviderName()).c_str()));
-#else
     setenv("EPICS4_CAS_PROVIDER_NAMES", m_channelProviderImpl->getProviderName().c_str(), 1);
-#endif
     m_serverContext = ServerContextImpl::create();
     
     m_serverContext->initialize(getChannelAccess());
diff --git a/pvAccessApp/utils/hexDump.cpp b/pvAccessApp/utils/hexDump.cpp
index 0ef140e..ce70873 100644
--- a/pvAccessApp/utils/hexDump.cpp
+++ b/pvAccessApp/utils/hexDump.cpp
@@ -68,11 +68,7 @@ void hexDump(String const & prologue, String const & name, const int8 *bs,
         if(((i-start)%16)==0) {
             out += chars;
             out += '\n';
-#if defined(__GNUC__) && __GNUC__ < 3
             chars.erase();
-#else
-            chars.clear();
-#endif
         }
 
         chars += toAscii(bs[i]);
diff --git a/pvAccessApp/utils/introspectionRegistry.cpp b/pvAccessApp/utils/introspectionRegistry.cpp
index af26bb7..7abc636 100644
--- a/pvAccessApp/utils/introspectionRegistry.cpp
+++ b/pvAccessApp/utils/introspectionRegistry.cpp
@@ -74,20 +74,12 @@ void IntrospectionRegistry::printKeysAndValues(string name)
 	cout << "############## print of all key/values of " << name.c_str() << " registry : ###################" << endl;
 	for(registryMap_t::iterator registryIter = _registry.begin(); registryIter != _registry.end(); registryIter++)
 	{
-#if defined(__GNUC__) && __GNUC__ < 3
 		buffer.erase();
-#else
-		buffer.clear();
-#endif
 		cout << "\t" << "Key: "<< registryIter->first << endl;
 		cout << "\t" << "Value: " << registryIter->second << endl;
 
 		cout << "\t" << "References: " << buffer.c_str() << endl;
-#if defined(__GNUC__) && __GNUC__ < 3
 		buffer.erase();
-#else
-		buffer.clear();
-#endif
 		registryIter->second->toString(&buffer);
 		cout << "\t" << "Value toString: " << buffer.c_str() << endl;
 	}