[exim] exim 4.52 compile error for Debian Linux

folks,

try to compile exim 4.52 and can't get past crypto error...

gcc -o exim
acl.o(.text+0x20af): In function `acl_ratelimit':
: undefined reference to `exp'
crypt16.o(.text+0x33): In function `crypt16':
: undefined reference to `crypt'
crypt16.o(.text+0x8e): In function `crypt16':
: undefined reference to `crypt'
collect2: ld returned 1 exit status
make[1]: *** [exim] Error 1
make[1]: Leaving directory `/home/src/exim-4.52/build-Linux-i386'
make: *** [go] Error 2


Thanks