problem compiling exim4 please advise

[linuxinfo@linuxpro.co.za]

I have a problem when i 'make' exim 4.14.
i get the following error every time.
"
dbstuff.h:101: db.h: No such file or directory
make[1]: *** [exim_dbmbuild.o] Error 1
make[1]: Leaving directory '/home/installs/exim/exim-4.14/build-Linux-i386'
make: *** [go] Error 2
"
Many thanks