I'm trying to install qwbfs application but when i enter the command : make

i get this:

tools.c:8:25: fatal error: openssl/md5.h: No such file or directory

compilation terminated.

make[1]: *** [../build/release/obj/unix/tools.o] Error 1

make[1]: Leaving directory `/home/speedox/qwbfsmanager-1.2.2-src/libwbfs'

make: *** [sub-libwbfs-make_default-ordered] Error 2 

can you please tell me where is the problem.

thanks in advance,