diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 16382c10..12909cf9 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -80,6 +80,7 @@ elseif(UNIX)
     set(LIBS_SYSTEM compat pthread)
   elseif(CMAKE_SYSTEM_NAME MATCHES "QNX")
     set(LIBS_SYSTEM c)
+    add_definitions(-D_QNX_SOURCE -DGULLIVER)
   else()
     set(LIBS_SYSTEM c pthread)
   endif()
diff --git a/src/MQTTPacket.h b/src/MQTTPacket.h
index 04c217ef..74a6bfbd 100644
--- a/src/MQTTPacket.h
+++ b/src/MQTTPacket.h
@@ -28,7 +28,19 @@
 #include "LinkedList.h"
 #include "Clients.h"
 
+
+#ifdef __cplusplus
+    #include <stdbool.h>
+#else
+    #ifndef __bool_true_false_are_defined
+        #ifndef bool
+            typedef unsigned int bool;
+        #endif
+    #endif
+#endif
+
 typedef unsigned int bit;
+
 typedef void* (*pf)(int, unsigned char, char*, size_t);
 
 #include "MQTTProperties.h"
@@ -58,7 +70,13 @@ enum msgTypes
 #endif
 
 /**
- * Bitfields for the MQTT header byte.
+ * 
+ 
+ 
+ 
+ 
+ 
+ fields for the MQTT header byte.
  */
 typedef union
 {
diff --git a/src/SHA1.c b/src/SHA1.c
index 5c4c3496..5a241af0 100644
--- a/src/SHA1.c
+++ b/src/SHA1.c
@@ -16,6 +16,13 @@
 
 #include "SHA1.h"
 
+// In the source files using endian functions (like SHA1.c):
+#ifdef QNX_OS
+#include <gulliver.h>
+#define be32toh(x) ENDIAN_BE32(x)
+#define htobe32(x) ENDIAN_BE32(x)
+#endif
+
 #if !defined(OPENSSL)
 #if defined(_WIN32)
 #pragma comment(lib, "crypt32.lib")
diff --git a/src/Thread.h b/src/Thread.h
index bb249aee..3fbf2b93 100644
--- a/src/Thread.h
+++ b/src/Thread.h
@@ -46,6 +46,10 @@
 	#undef ETIMEDOUT
 	#define ETIMEDOUT WSAETIMEDOUT
 #else
+    #if defined(QNX_OS)
+        #include <sys/neutrino.h>
+        #include <process.h>
+    #endif
 	#include <pthread.h>
 
 	#define thread_type pthread_t