Some doc corrections; Watcom C++ corrections; VC++ 4 corrections

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@5875 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/msw/install.txt

@@ -282,9 +282,22 @@ Note (1): setup.h overrides wxUSE_LIBJPEG and sets it to 0, since
 imagjpeg.cpp doesn't compile.
 Note (2): makewat.env uses the odbc32.lib supplied in wxWindows' lib\watcom
 directory. See the notes in that directory.
-Note (3): makefile compilation seems broken (28/12/99) with a
-GPF in the linker. Too many object files? Could try switching
-some options off in setup.h.
+Note (3): if variant.cpp is compiled with date/time class
+options, the linker gives up. So the date/time option is switched
+off for Watcom C++. Also, wxAutomationObject is not compiled with
+Watcom C++.
+Note (4): if Watcom can't read the precompiled header when
+building a sample, try deleting src\msw\watcom.pch and
+compiling the sample again.
+Note (5): if you get _popen_ and _pclose_ link errors, try
+recompiling wxWindows with XPM support disabled in setup.h.
+Alternatively, make sure these lines exist at the top of
+src\xpm\xpmi.h:
+
+// Added by JACS for Watcom C++/wxWindows compilation (no popen/pclose functions)
+#ifdef __WATCOMC__
+#define NO_ZPIPE
+#endif
 
 Metrowerks CodeWarrior compilation
 ----------------------------------