Changes to compile under windows:

* in numbers.c do the same protection agains duplicate definition of isnan
() and isinf() as is in libxml\xpath.c 
* in xsltconfig.h the same trick as in libxml to include either 
win32config.h (from libxml) or config.h 
* in xsltproc.c needs to define gettimeofday() and include winsock2.h, the 
same code as in xmllint.c 
* add MSVC project files (*dsp, *dsw, *def). Those assume that libxml is 
in sibling to libxslt directory called gnome-xml. For different layouts 
path will have to be changed manually.

I've tested this patch by doing clean checkout out of CVS, applying 
patches, ./autogen.sh, copying files to win machine and compiling. I've 
also compiled under RedHat Linux 6.2

To fully work they require my other patches for libxml to compile under 
Win and expose all necessary symbols that libxslt uses. 

I've put both patch and project files (too big to include inline) here:
http://acs-misc.sourceforge.net/wiki/index.php?PatchForLibxslt

I can also e-mail them.

Patch is as follows:

Index: libxslt/numbers.c
===================================================================
RCS file: /cvs/gnome/libxslt/libxslt/numbers.c,v
retrieving revision 1.17
diff -u -r1.17 numbers.c
--- libxslt/numbers.c   2001/06/21 22:13:02     1.17
+++ libxslt/numbers.c   2001/06/22 11:15:57
@@ -83,7 +83,9 @@
     }
 }

-#ifndef isnan
+#ifndef isnan
+#ifndef HAVE_ISNAN
+
 /*
  * NaN (Not-A-Number)
  *
@@ -101,9 +103,11 @@
 {
     return (!(number < 0.0 || number > 0.0) && (number != 0.0));
 }
-#endif
+#endif /* !HAVE_ISNAN */
+#endif /* !isnan */

-#ifndef isinf
+#ifndef isinf
+#ifndef HAVE_ISINF
 /*
  * Infinity (positive and negative)
  *
@@ -118,7 +122,8 @@
     return FALSE;
 # endif
 }
-#endif
+#endif /* !HAVE_ISINF */
+#endif /* !isinf */

 static void
 xsltNumberFormatDecimal(xmlBufferPtr buffer,
Index: libxslt/xsltconfig.h.in
===================================================================
RCS file: /cvs/gnome/libxslt/libxslt/xsltconfig.h.in,v
retrieving revision 1.7
diff -u -r1.7 xsltconfig.h.in
--- libxslt/xsltconfig.h.in     2001/06/17 11:25:09     1.7
+++ libxslt/xsltconfig.h.in     2001/06/22 11:12:30
@@ -9,7 +9,11 @@
 #ifndef __XML_XSLTCONFIG_H__
 #define __XML_XSLTCONFIG_H__

+#ifdef WIN32
+#include <win32config.h>
+#else
 #include "config.h"
+#endif

 #ifdef __cplusplus
 extern "C" {
Index: libxslt/xsltproc.c
===================================================================
RCS file: /cvs/gnome/libxslt/libxslt/xsltproc.c,v
retrieving revision 1.32
diff -u -r1.32 xsltproc.c
--- libxslt/xsltproc.c  2001/06/17 11:25:09     1.32
+++ libxslt/xsltproc.c  2001/06/22 11:13:57
@@ -37,6 +37,16 @@
 #include <libxslt/xsltInternals.h>
 #include <libxslt/transform.h>
 #include <libxslt/xsltutils.h>
+
+#ifdef WIN32
+#ifdef _MSC_VER
+#include <winsock2.h>
+#pragma comment(lib, "ws2_32.lib")
+#define gettimeofday(p1,p2)
+#endif /* _MS_VER */
+#else /* WIN32 */
+#include <sys/time.h>
+#endif /* WIN32 */

 extern int xmlLoadExtDtdDefaultValue;