We can use cp on Windows. cp is a built-in command of shmsdos.exe and is

in both MKS and Cygwin toolkits, so it is not a new build tool requirement.

security/coreconf/WIN32.mk

@@ -95,7 +95,7 @@ ifdef MAPFILE
 DLLFLAGS += -DEF:$(MAPFILE)
 endif
 # Change PROCESS to put the mapfile in the correct format for this platform
-PROCESS_MAP_FILE = perl -e "open INFILE, \"< $(LIBRARY_NAME).def\" ; open OUTFILE, \"> $@ \"; print OUTFILE <INFILE>" 
+PROCESS_MAP_FILE = cp $(LIBRARY_NAME).def $@
 
 
 #