after running ./configure --prefix=/opt, make works, make install then fails 
with:
gcc -g -O2 -Wall -Wpointer-arith -Wno-uninitialized -I. -I. -I/opt  
-DSSHDIR=\"/opt/etc\" -D_PATH_SSH_PROGRAM=\"/opt/bin/ssh\" 
-D_PATH_SSH_ASKPASS_DEFAULT=\"/opt/libexec/ssh-askpass\" 
-D_PATH_SFTP_SERVER=\"/opt/libexec/sftp-server\" -D_PATH_SSH_PIDDIR=\"/var/run\" 
-DSSH_RAND_HELPER=\"/opt/libexec/ssh-rand-helper\" -DHAVE_CONFIG_H -c dh.c
cipher.c: In function `evp_rijndael':
cipher.c:494: warning: assignment from incompatible pointer type
cipher.c:495: warning: assignment from incompatible pointer type
cipher.c:496: warning: assignment from incompatible pointer type
cipher.c:497: structure has no member named `flags'
cipher.c:497: `EVP_CIPH_CBC_MODE' undeclared (first use in this function)
cipher.c:497: `EVP_CIPH_VARIABLE_LENGTH' undeclared (first use in this function)
cipher.c:498: `EVP_CIPH_ALWAYS_CALL_INIT' undeclared (first use in this 
function)
make: *** [cipher.o] Error 1
make: *** Waiting for unfinished jobs....