Cleanup temp files without rm

@@ -47,10 +47,11 @@
 
 $(__GNUC)LDLIBS +=      -lc
 $(__GNUC)LDFLAGS=       $(MAPFILE.NES:%=-Wl,-M%)
 
 $(ROOTONBLDMAN1ONBLDFILES) := FILEMODE=      644
+CSTD=   $(CSTD_GNU99)
 
 # Assume we don't have the install.bin available yet
 INS.file=       $(RM) $@; $(CP) $< $(@D); $(CHMOD) $(FILEMODE) $@
 
 .KEEP_STATE: