[Exim] exim and RH7

I am not sure whats up.. but I have db1,2 and 3 installed but I can't get exim to compile


gcc -c -O -I. os.c
gcc -O -o exim_dbmbuild exim_dbmbuild.c \
os.o -lnsl -lcrypt -ldb
/usr/bin/ld: cannot find -ldb
collect2: ld returned 1 exit status
make[1]: *** [exim_dbmbuild] Error 1
make[1]: Leaving directory `/usr/local/src/exim-3.16/build-Linux-i386'
make: *** [go] Error 2

Any Ideas?

Later,
Brian