busybox compilation error

[tomy]

hi,
I am compiling busybox 1.7.2 using make "ARCH=armCROSS_COMPILE=armv5l-linux-", but while compiling it is giving an error like 
Trying libraries: crypt m
Library crypt is needed
Library m is needed
Final link with: crypt m
What will be the reason for this.

After that I tried
"make ARCH=armCROSS_COMPILE=armv5l-linux- install" Then it is creating binaries, but all binaries are in big size (around 752K). 

Why this much big size..

With Regards,
Tomy Devasia