5166 sendmail package should be replaceable

*** 31,35 ****
--- 31,43 ----
  CERRWARN +=     -_gcc=-Wno-uninitialized
  CERRWARN +=     -_gcc=-Wno-implicit-function-declaration
  CERRWARN +=     -_gcc=-Wno-empty-body
  CERRWARN +=     -_gcc=-Wno-unused-variable
  DBMDEF=         -DNDBM -DNEWDB -DNIS -DUSERDB -DMAP_REGEX -DLDAPMAP
+ 
+ ROOTLIBSMTPSM = $(ROOTLIB)/smtp/sendmail
+ 
+ $(ROOTLIBSMTPSM):
+         $(INS.dir)
+ 
+ $(ROOTLIBSMTPSM)/%: %
+         $(INS.file)