安裝Postfix 問題

[chris01519]

我在裝Postfix 的時候，在Postfix 資料底下輸入make
結果出現以下訊息
make -f Makefile.in MAKELEVEL= Makefiles
(echo "# Do not edit -- this file documents how Postfix was built for your machine."; /bin/sh makedefs) >makedefs.tmp
No <db.h> include file found.
Install the appropriate db*-devel package first.
See the RELEASE_NOTES file for more information.
make: *** [Makefiles] Error 1
make: *** [Makefiles] Error 2

是不是有相關套件沒有下載??
懇請各位大大指點Orz