diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index a4854c24..4e52956c 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 socket)
+    add_definitions(-D_QNX_SOURCE)
   else()
     set(LIBS_SYSTEM c pthread)
   endif()
diff --git a/src/SHA1.c b/src/SHA1.c
index 5c4c3496..adf502d7 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 __QNXNTO__
+#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")