According to some old discussion (http://www.mail-archive.com/wine-devel@xxxxxxxxxx/msg15669.html) on wine-devel it appears that __WINE__ should be the macro used to identify the Wine platform, However, that doesn't appear to work for Windows native MinGW on wine. Here is my test code: #include <stdio.h> int main(int argc, char** argv) { #if defined(__WINE__) printf("hello, WINE world\n"); #else printf("hello, non-WINE world\n"); #endif return 0; } wine@raven> wine gcc --version gcc.exe (GCC) 4.5.0 Copyright (C) 2010 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. wine@raven> wine gcc test.c wine@raven> wine ./a.exe hello, non-WINE world I have downloaded and unpacked the Windows version of MinGW (version 4.5.0), and the above gcc --version result shows that is the version being used under wine. I have looked in the installed header files for wine-1.2-rc3, and I can find no mention of __WINE__. Furthermore, it appears from http://linux.die.net/man/1/winegcc that only wingcc sets __WINE__. However, I don't want to cross-compile for the Wine platform under Linux. Instead, my approach is to use Windows versions of MinGW and CMake to build _AND_ test applications and libraries directly under wine. So it appears for now I must set __WINE__ explicitly, e.g., wine@raven> wine gcc -D__WINE__ test.c wine@raven> wine ./a.exe hello, WINE world but the issue is that should happen automatically instead. Is there some better macro I should be using to identify when a build is occurring on the wine platform? Alan __________________________ Alan W. Irwin Astronomical research affiliation with Department of Physics and Astronomy, University of Victoria (astrowww.phys.uvic.ca). Programming affiliations with the FreeEOS equation-of-state implementation for stellar interiors (freeeos.sf.net); PLplot scientific plotting software package (plplot.org); the libLASi project (unifont.org/lasi); the Loads of Linux Links project (loll.sf.net); and the Linux Brochure Project (lbproject.sf.net). __________________________ Linux-powered Science __________________________