diff --git a/Include/osdefs.h b/Include/osdefs.h
index f9149199bc6..594fc107cf0 100644
--- a/Include/osdefs.h
+++ b/Include/osdefs.h
@@ -44,12 +44,15 @@ PERFORMANCE OF THIS SOFTWARE.
 #define DELIM '\n'
 #endif
 
+/* Mod by chrish: QNX has WATCOM, but isn't DOS */
+#if !defined(__QNX__)
 #if defined(MS_WINDOWS) || defined(__BORLANDC__) || defined(__WATCOMC__) || defined(__DJGPP__) || defined(__TOS_OS2__)
 #define SEP '\\'
 #define ALTSEP '/'
 #define MAXPATHLEN 256
 #define DELIM ';'
 #endif
+#endif
 
 /* Filename separator */
 #ifndef SEP
diff --git a/Modules/timemodule.c b/Modules/timemodule.c
index 6390c407892..3fedfa63cd8 100644
--- a/Modules/timemodule.c
+++ b/Modules/timemodule.c
@@ -64,7 +64,7 @@ extern int ftime();
 #endif /* MS_WINDOWS */
 #endif /* HAVE_FTIME */
 
-#ifdef __WATCOMC__
+#if defined(__WATCOMC__) && !defined(__QNX__)
 #include <i86.h>
 #else
 #ifdef MS_WINDOWS
@@ -77,7 +77,7 @@ extern int ftime();
 #define altzone _altzone
 #endif /* MS_WIN16 */
 #endif /* MS_WINDOWS */
-#endif /* !__WATCOMC__ */
+#endif /* !__WATCOMC__ || __QNX__ */
 
 #ifdef MS_WIN32
 /* Win32 has better clock replacement */
@@ -558,12 +558,12 @@ floatsleep(double secs)
 			return -1;
 	}
 #else /* !macintosh */
-#ifdef __WATCOMC__
+#if defined(__WATCOMC__) && !defined(__QNX__)
 	/* XXX Can't interrupt this sleep */
 	Py_BEGIN_ALLOW_THREADS
 	delay((int)(secs * 1000 + 0.5));  /* delay() uses milliseconds */
 	Py_END_ALLOW_THREADS
-#else /* !__WATCOMC__ */
+#else /* !__WATCOMC__ || __QNX__ */
 #ifdef MSDOS
 	struct timeb t1, t2;
 	double frac;
@@ -614,7 +614,7 @@ floatsleep(double secs)
 #endif /* !PYOS_OS2 */
 #endif /* !MS_WIN32 */
 #endif /* !MSDOS */
-#endif /* !__WATCOMC__ */
+#endif /* !__WATCOMC__ || __QNX__ */
 #endif /* !macintosh */
 #endif /* !HAVE_SELECT */
 	return 0;
diff --git a/Parser/intrcheck.c b/Parser/intrcheck.c
index 7fe6205f444..1320bd8f20e 100644
--- a/Parser/intrcheck.c
+++ b/Parser/intrcheck.c
@@ -64,7 +64,7 @@ PyOS_InterruptOccurred()
 
 #endif /* QUICKWIN */
 
-#ifdef _M_IX86
+#if defined(_M_IX86) && !defined(__QNX__)
 #include <io.h>
 #endif
 
@@ -160,7 +160,7 @@ extern int PyErr_CheckSignals();
 
 /* ARGSUSED */
 static RETSIGTYPE
-#ifdef _M_IX86
+#if defined(_M_IX86) && !defined(__QNX__)
 intcatcher(int sig)	/* So the C compiler shuts up */
 #else /* _M_IX86 */
 intcatcher(sig)