-#include "wx/setup.h" // always include this file (under Unix it's generated by configure)
-#include "wx/defs.h" // compiler definitions
+// compiler detection; includes setup.h
+#include "wx/defs.h"
+
+// check if to use precompiled headers: do it for most Windows compilers unless
+// explicitly disabled by defining NOPCH
+#if ( defined(__WXMSW__) && \
+ ( defined(__BORLANDC__) || \
+ defined(__VISUALC__) || \
+ defined(__DIGITALMARS__) || \
+ defined(__WATCOMC__) ) ) || \
+ defined(__VISAGECPP__) || \
+ defined(__MWERKS__)