[chorns] 14728: Document ROS_PREFIX environment variable

Document ROS_PREFIX environment variable
Modified: branches/xmlbuildsystem/reactos/Makefile
  _____  

Modified: branches/xmlbuildsystem/reactos/Makefile
--- branches/xmlbuildsystem/reactos/Makefile	2005-04-21 09:38:45 UTC
(rev 14727)
+++ branches/xmlbuildsystem/reactos/Makefile	2005-04-21 09:52:11 UTC
(rev 14728)
@@ -1,5 +1,11 @@

 # Accepted environment variables:
 #
+#    ROS_PREFIX
+#        This variable specifies the prefix of the MinGW installation.
On Windows
+#        a prefix is usually not needed, but on linux it is usually
"mingw32-". If
+#        not present and no executable named "gcc" can be found, then
the prefix is
+#        assumed to be "mingw32-".
+#
 #    ROS_INTERMEDIATE
 #        This variable controls where to put intermediate files.
Intermediate
 #        files are generated files that are needed to generate the
final