Issue While Installing NCrack 0.4Alpha

So today I was trying to install NCrack 0.4Alpha, and I encountered this problem of undeclared variable DE1 and userkey not in scope. Below are the commands to run and the red marks where the errors appear.

wget http://nmap.org/ncrack/dist/ncrack-0.4ALPHA.tar.gz
tar xzf ncrack-0.4ALPHA.tar.gz
cd ncrack-0.4ALPHA.tar.gz && ./configure
make
make install

The errors:

... 
crypto.cc: In function 'void deskey(unsigned char*, int)':
crypto.cc:545:14: error: 'DE1' was not declared in this scope
crypto.cc: In function 'void cookey(long unsigned int*)':
crypto.cc:590:14: error: 'usekey' was not declared in this scope
...

Online people suggest to install the following crypto packages. And then redo above installation steps.

sudo apt-get install build-essential checkinstall libssl-dev libssh-dev

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