Using gcc on Solaris 8 for x86:
(only option to configure: --with-pam)
(THis is with latest: openssh-3.1p1.  openssh-3.0.2p1 compiles and works fine.)

(cd openbsd-compat && make)
gcc -g -O2 -Wall -Wpointer-arith -Wno-uninitialized -I. -I.
-I/usr/local/ssl/include  -I/usr/local/include -DSSHDIR=\"/usr/local/etc\" 
-D_PATH_SSH_PROGRAM=\"/usr/local/bin/ssh\" 
-D_PATH_SSH_ASKPASS_DEFAULT=\"/usr/local/libexec/ssh-askpass\" 
-D_PATH_SFTP_SERVER=\"/usr/local/libexec/sftp-server\" 
-D_PATH_SSH_PIDDIR=\"/var/run\" 
-DSSH_RAND_HELPER=\"/usr/local/libexec/ssh-rand-helper\" -DHAVE_CONFIG_H -c
cipher.c
cipher.c: In function `cipher_init':
cipher.c:200: void value not ignored as it ought to be
cipher.c:206: warning: implicit declaration of function
`EVP_CIPHER_CTX_set_key_length'
cipher.c:210: void value not ignored as it ought to be
cipher.c: In function `cipher_crypt':
cipher.c:220: void value not ignored as it ought to be
cipher.c: In function `cipher_cleanup':
cipher.c:227: void value not ignored as it ought to be
cipher.c: In function `ssh1_3des_init':
cipher.c:280: warning: assignment from incompatible pointer type
cipher.c:299: void value not ignored as it ought to be
cipher.c:300: void value not ignored as it ought to be
cipher.c:301: void value not ignored as it ought to be
cipher.c: In function `ssh1_3des_cbc':
cipher.c:314: warning: assignment from incompatible pointer type
cipher.c:318: void value not ignored as it ought to be
cipher.c:319: void value not ignored as it ought to be
cipher.c:320: void value not ignored as it ought to be
cipher.c: In function `ssh1_3des_cleanup':
cipher.c:329: warning: assignment from incompatible pointer type
cipher.c: In function `evp_ssh1_3des':
cipher.c:346: warning: assignment from incompatible pointer type
cipher.c:347: warning: assignment from incompatible pointer type
cipher.c:348: warning: assignment from incompatible pointer type
cipher.c:349: structure has no member named `flags'
cipher.c:349: `EVP_CIPH_CBC_MODE' undeclared (first use in this function)
cipher.c:349: (Each undeclared identifier is reported only once
cipher.c:349: for each function it appears in.)
cipher.c:349: `EVP_CIPH_VARIABLE_LENGTH' undeclared (first use in this function)
cipher.c: In function `evp_ssh1_bf':
cipher.c:392: warning: assignment from incompatible pointer type
cipher.c:394: warning: assignment from incompatible pointer type
cipher.c: In function `ssh_rijndael_init':
cipher.c:413: warning: assignment from incompatible pointer type
cipher.c: In function `ssh_rijndael_cbc':
cipher.c:440: warning: assignment from incompatible pointer type
cipher.c: In function `ssh_rijndael_cleanup':
cipher.c:477: warning: assignment from incompatible pointer type
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)
*** Error code 1
make: Fatal error: Command failed for target `cipher.o'