diff --git a/Foundation/CMakeLists.txt b/Foundation/CMakeLists.txt
index 617ff5947..c3e28fde8 100644
--- a/Foundation/CMakeLists.txt
+++ b/Foundation/CMakeLists.txt
@@ -165,7 +165,7 @@ else()
 			elseif("${CMAKE_SYSTEM_NAME}" STREQUAL "FreeBSD")
 				target_compile_definitions(Foundation PUBLIC POCO_HAVE_FD_POLL)
 				target_link_libraries(Foundation PUBLIC pthread ${CMAKE_DL_LIBS} rt)
-			elseif("${CMAKE_SYSTEM_NAME}" STREQUAL "AIX")
+			elseif("${CMAKE_SYSTEM_NAME}" STREQUAL "AIX"  OR "${CMAKE_SYSTEM_NAME}" STREQUAL "GNU")
 				target_compile_definitions(Foundation PUBLIC _XOPEN_SOURCE=500 POCO_HAVE_FD_POLL)
 				target_link_libraries(Foundation PUBLIC pthread ${CMAKE_DL_LIBS} rt)
 			else()
diff --git a/Foundation/include/Poco/NamedEvent_UNIX.h b/Foundation/include/Poco/NamedEvent_UNIX.h
index 22cb31dc9..f4b5255f7 100644
--- a/Foundation/include/Poco/NamedEvent_UNIX.h
+++ b/Foundation/include/Poco/NamedEvent_UNIX.h
@@ -19,7 +19,7 @@
 
 
 #include "Poco/Foundation.h"
-#if defined(sun) || defined(__APPLE__) || defined(__osf__) || defined(__QNX__) || defined(_AIX)
+#if defined(sun) || defined(__APPLE__) || defined(__osf__) || defined(__QNX__) || defined(_AIX) || defined(__GNU__)
 #include <semaphore.h>
 #endif
 
@@ -39,7 +39,7 @@ private:
 	std::string getFileName();
 
 	std::string _name;
-#if defined(sun) || defined(__APPLE__) || defined(__osf__) || defined(__QNX__) || defined(_AIX)
+#if defined(sun) || defined(__APPLE__) || defined(__osf__) || defined(__QNX__) || defined(_AIX) || defined(__GNU__)
 	sem_t* _sem;
 #else
 	int _semid;  // semaphore id
diff --git a/Foundation/include/Poco/NamedMutex_UNIX.h b/Foundation/include/Poco/NamedMutex_UNIX.h
index 151aa1ead..b60d6bc2a 100644
--- a/Foundation/include/Poco/NamedMutex_UNIX.h
+++ b/Foundation/include/Poco/NamedMutex_UNIX.h
@@ -21,7 +21,7 @@
 #include "Poco/Foundation.h"
 #include <sys/types.h>
 #include <sys/stat.h>
-#if defined(sun) || defined(__APPLE__) || defined(__osf__) || defined(__QNX__) || defined(_AIX)
+#if defined(sun) || defined(__APPLE__) || defined(__osf__) || defined(__QNX__) || defined(_AIX) || defined(__GNU__)
 #include <semaphore.h>
 #endif
 
@@ -42,7 +42,7 @@ private:
 	std::string getFileName();
 
 	std::string _name;
-#if defined(sun) || defined(__APPLE__) || defined(__osf__) || defined(__QNX__) || defined(_AIX)
+#if defined(sun) || defined(__APPLE__) || defined(__osf__) || defined(__QNX__) || defined(_AIX) || defined(__GNU__)
 	sem_t* _sem;
 #else
 	int _semid;  // semaphore id
diff --git a/Foundation/src/Environment_UNIX.cpp b/Foundation/src/Environment_UNIX.cpp
index b7e57e431..eb9042b9c 100644
--- a/Foundation/src/Environment_UNIX.cpp
+++ b/Foundation/src/Environment_UNIX.cpp
@@ -279,6 +279,54 @@ void EnvironmentImpl::nodeIdImpl(NodeId& id)
 } // namespace Poco
 
 
+#elif defined(__GNU__)
+//
+// GNU Hurd
+//
+#include <sys/ioctl.h>
+#include <net/if.h>
+#include <unistd.h>
+#include <netinet/in.h>
+
+
+namespace Poco {
+
+
+void EnvironmentImpl::nodeIdImpl(NodeId& id)
+{
+	std::memset(&id, 0, sizeof(id));
+	struct ifreq ifr;
+	struct ifconf ifc;
+	char buf[1024];
+
+	int sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
+	if (sock == -1) return;
+
+	ifc.ifc_len = sizeof(buf);
+	ifc.ifc_buf = buf;
+	if (ioctl(sock, SIOCGIFCONF, &ifc) == -1) return;
+
+	struct ifreq* it = ifc.ifc_req;
+	const struct ifreq* const end = it + (ifc.ifc_len / sizeof(struct ifreq));
+
+	for (; it != end; ++it) {
+		std::strcpy(ifr.ifr_name, it->ifr_name);
+		if (ioctl(sock, SIOCGIFFLAGS, &ifr) == 0) {
+			if (! (ifr.ifr_flags & IFF_LOOPBACK)) { // don't count loopback
+				if (ioctl(sock, SIOCGIFHWADDR, &ifr) == 0) {
+					std::memcpy(&id, ifr.ifr_hwaddr.sa_data, sizeof(id));
+					break;
+				}
+			}
+		}
+		else return;
+	}
+}
+
+
+} // namespace Poco
+
+
 #elif defined(POCO_OS_FAMILY_UNIX)
 //
 // General Unix
diff --git a/Foundation/src/NamedEvent_UNIX.cpp b/Foundation/src/NamedEvent_UNIX.cpp
index b0cc100cd..686d770c8 100644
--- a/Foundation/src/NamedEvent_UNIX.cpp
+++ b/Foundation/src/NamedEvent_UNIX.cpp
@@ -18,7 +18,7 @@
 #include <fcntl.h>
 #include <sys/stat.h>
 #include <errno.h>
-#if defined(sun) || defined(__APPLE__) || defined(__osf__) || defined(__QNX__) || defined(_AIX)
+#if defined(sun) || defined(__APPLE__) || defined(__osf__) || defined(__QNX__) || defined(_AIX) || defined(__GNU__)
 #include <semaphore.h>
 #else
 #include <unistd.h>
@@ -53,7 +53,7 @@ NamedEventImpl::NamedEventImpl(const std::string& name):
 	_name(name)
 {
 	std::string fileName = getFileName();
-#if defined(sun) || defined(__APPLE__) || defined(__osf__) || defined(__QNX__) || defined(_AIX)
+#if defined(sun) || defined(__APPLE__) || defined(__osf__) || defined(__QNX__) || defined(_AIX) || defined(__GNU__)
 	_sem = sem_open(fileName.c_str(), O_CREAT, S_IRWXU | S_IRWXG | S_IRWXO, 0);
 	if ((long) _sem == (long) SEM_FAILED)
 		throw SystemException(Poco::format("cannot create named mutex %s (sem_open() failed, errno=%d)", fileName, errno), _name);
@@ -80,13 +80,13 @@ NamedEventImpl::NamedEventImpl(const std::string& name):
 		_semid = semget(key, 1, 0);
 	}
 	else throw SystemException(Poco::format("cannot create named mutex %s (semget() failed, errno=%d)", fileName, errno), _name);
-#endif // defined(sun) || defined(__APPLE__) || defined(__osf__) || defined(__QNX__) || defined(_AIX)
+#endif // defined(sun) || defined(__APPLE__) || defined(__osf__) || defined(__QNX__) || defined(_AIX) || defined(__GNU__)
 }
 
 
 NamedEventImpl::~NamedEventImpl()
 {
-#if defined(sun) || defined(__APPLE__) || defined(__osf__) || defined(__QNX__) || defined(_AIX)
+#if defined(sun) || defined(__APPLE__) || defined(__osf__) || defined(__QNX__) || defined(_AIX) || defined(__GNU__)
 	sem_close(_sem);
 #endif
 }
@@ -94,7 +94,7 @@ NamedEventImpl::~NamedEventImpl()
 
 void NamedEventImpl::setImpl()
 {
-#if defined(sun) || defined(__APPLE__) || defined(__osf__) || defined(__QNX__) || defined(_AIX)
+#if defined(sun) || defined(__APPLE__) || defined(__osf__) || defined(__QNX__) || defined(_AIX) || defined(__GNU__)
 	if (sem_post(_sem) != 0)
 	   	throw SystemException("cannot set named event", _name);
 #else
@@ -110,7 +110,7 @@ void NamedEventImpl::setImpl()
 
 void NamedEventImpl::waitImpl()
 {
-#if defined(sun) || defined(__APPLE__) || defined(__osf__) || defined(__QNX__) || defined(_AIX)
+#if defined(sun) || defined(__APPLE__) || defined(__osf__) || defined(__QNX__) || defined(_AIX) || defined(__GNU__)
 	int err;
 	do
 	{
diff --git a/Foundation/src/NamedMutex_UNIX.cpp b/Foundation/src/NamedMutex_UNIX.cpp
index 6466b2ba2..1f52c9798 100644
--- a/Foundation/src/NamedMutex_UNIX.cpp
+++ b/Foundation/src/NamedMutex_UNIX.cpp
@@ -18,7 +18,7 @@
 #include <fcntl.h>
 #include <sys/stat.h>
 #include <errno.h>
-#if defined(sun) || defined(__APPLE__) || defined(__osf__) || defined(_AIX)
+#if defined(sun) || defined(__APPLE__) || defined(__osf__) || defined(_AIX) || defined(__GNU__)
 #include <semaphore.h>
 #else
 #include <unistd.h>
@@ -53,7 +53,7 @@ NamedMutexImpl::NamedMutexImpl(const std::string& name):
 	_name(name)
 {
 	std::string fileName = getFileName();
-#if defined(sun) || defined(__APPLE__) || defined(__osf__) || defined(__QNX__) || defined(_AIX)
+#if defined(sun) || defined(__APPLE__) || defined(__osf__) || defined(__QNX__) || defined(_AIX) || defined(__GNU__)
 	_sem = sem_open(fileName.c_str(), O_CREAT, S_IRWXU | S_IRWXG | S_IRWXO, 1);
 	if ((long) _sem == (long) SEM_FAILED)
 		throw SystemException(Poco::format("cannot create named mutex %s (sem_open() failed, errno=%d)", fileName, errno), _name);
@@ -85,13 +85,13 @@ NamedMutexImpl::NamedMutexImpl(const std::string& name):
 	}
 
 	throw SystemException(Poco::format("cannot create named mutex %s (semget() failed, errno=%d)", fileName, errno), _name);
-#endif // defined(sun) || defined(__APPLE__) || defined(__osf__) || defined(__QNX__) || defined(_AIX)
+#endif // defined(sun) || defined(__APPLE__) || defined(__osf__) || defined(__QNX__) || defined(_AIX) || defined(__GNU__)
 }
 
 
 NamedMutexImpl::~NamedMutexImpl()
 {
-#if defined(sun) || defined(__APPLE__) || defined(__osf__) || defined(__QNX__) || defined(_AIX)
+#if defined(sun) || defined(__APPLE__) || defined(__osf__) || defined(__QNX__) || defined(_AIX) || defined(__GNU__)
 	sem_close(_sem);
 #else
 	if (_owned) semctl(_semid, 0, IPC_RMID, 0);
@@ -101,7 +101,7 @@ NamedMutexImpl::~NamedMutexImpl()
 
 void NamedMutexImpl::lockImpl()
 {
-#if defined(sun) || defined(__APPLE__) || defined(__osf__) || defined(__QNX__) || defined(_AIX)
+#if defined(sun) || defined(__APPLE__) || defined(__osf__) || defined(__QNX__) || defined(_AIX) || defined(__GNU__)
 	int err;
 	do
 	{
@@ -127,7 +127,7 @@ void NamedMutexImpl::lockImpl()
 
 bool NamedMutexImpl::tryLockImpl()
 {
-#if defined(sun) || defined(__APPLE__) || defined(__osf__) || defined(__QNX__) || defined(_AIX)
+#if defined(sun) || defined(__APPLE__) || defined(__osf__) || defined(__QNX__) || defined(_AIX) || defined(__GNU__)
 	return sem_trywait(_sem) == 0;
 #else
 	struct sembuf op;
@@ -141,7 +141,7 @@ bool NamedMutexImpl::tryLockImpl()
 
 void NamedMutexImpl::unlockImpl()
 {
-#if defined(sun) || defined(__APPLE__) || defined(__osf__) || defined(__QNX__) || defined(_AIX)
+#if defined(sun) || defined(__APPLE__) || defined(__osf__) || defined(__QNX__) || defined(_AIX) || defined(__GNU__)
 	if (sem_post(_sem) != 0)
 	   	throw SystemException("cannot unlock named mutex", _name);
 #else