linux-h9j5:~/Desktop/cowpatty # make
cc -pipe -Wall -DOPENSSL  -g3 -ggdb   -c -o md5.o md5.c
md5.c:25:25: error: openssl/md5.h: No such file or directory
md5.c: In function ‘md5_mac’:
md5.c:33: error: ‘MD5_CTX’ undeclared (first use in this function)
md5.c:33: error: (Each undeclared identifier is reported only once
md5.c:33: error: for each function it appears in.)
md5.c:33: error: expected ‘;’ before ‘context’
md5.c:34: warning: implicit declaration of function ‘MD5_Init’
md5.c:34: error: ‘context’ undeclared (first use in this function)
md5.c:35: warning: implicit declaration of function ‘MD5_Update’
md5.c:38: warning: implicit declaration of function ‘MD5_Final’
md5.c: In function ‘hmac_md5_vector’:
md5.c:45: error: ‘MD5_CTX’ undeclared (first use in this function)
md5.c:45: error: expected ‘;’ before ‘context’
md5.c:53: error: ‘context’ undeclared (first use in this function)
make: *** [md5.o] Error 1