Here's my issue ...when trying to build pine with the following command:

./build lnx SSLDIR=/usr/include/openssl

this error comes up:

make[4]: Entering directory `/root/pine4.62/imap/c-client'
echo -DMD5ENABLE=\"/etc/cram-md5.pwd\" >> OSCFLAGS
make[4]: Leaving directory `/root/pine4.62/imap/c-client'
ln -s os_lnx.h osdep.h
ln -s os_lnx.c osdepbas.c
ln -s log_std.c osdeplog.c
ln -s sig_psx.c siglocal.c
ln -s crx_nfs.c crexcl.c
ln -s ip4_unix.c ip_unix.c
ln: `ip_unix.c': File exists
make[3]: *** [onceenv] Error 1
make[3]: Leaving directory `/root/pine4.62/imap/c-client'
make[2]: *** [lnx] Error 2
make[2]: Leaving directory `/root/pine4.62/imap/c-client'
make[1]: *** [OSTYPE] Error 2
make[1]: Leaving directory `/root/pine4.62/imap'
make: *** [lnx] Error 2
+---------------------------------------------+
| Problems building c-client |
| |
| Please check the output above for a |
| possible explanation for this failure |
+---------------------------------------------+


What is the meaning of this and how should I fix it ?

Delete the file /root/pine4.62/imap/c-client/ip_unix.c.

On top of that, you should be compiling applications as a user, not as root.

Well , I have figured it out myself this time ...
I was building pine with the wrong option ... also I had to do ./build clean firts ..and then ./build slx .. not lnx ...however ..now everything is working great ....

Thanks anyway ..I hope I helped someone