port manually into /usr/ports/distfiles/acroread and try again.

kopril# cd /usr/ports/print/acroread8
kopril# make install clean
===> Vulnerability check disabled, database not found
===> Extracting for acroread8-8.1.7
=> MD5 Checksum mismatch for acroread/AdobeReader_enu-8.1.7-1.i486.tar.bz2.
=> SHA256 Checksum mismatch for acroread/AdobeReader_enu-8.1.7-1.i486.tar.bz2.
===> Refetch for 1 more times files: acroread/AdobeReader_enu-8.1.7-1.i486.tar.bz2 acroread/AdobeReader_enu-8.1.7-1.i486.tar.bz2
===> Vulnerability check disabled, database not found
=> AdobeReader_enu-8.1.7-1.i486.tar.bz2 doesn't seem to exist in /usr/ports/distfiles/acroread.
=> Attempting to fetch from ftp://ftp.itb.ac.id/pub/FreeBSD/ports/distfiles/acroread/.
fetch: ftp://ftp.itb.ac.id/pub/FreeBSD/ports/distfiles/acroread/AdobeReader_enu-8.1.7-1.i486.tar.bz2: File unavailable (e.g., file not found, no access)
=> Attempting to fetch from http://ardownload.adobe.com/pub/adobe/reader/unix/8.x/8.1.7/enu/.
fetch: AdobeReader_enu-8.1.7-1.i486.tar.bz2: local modification time does not match remote
=> Attempting to fetch from ftp://ftp.adobe.com/pub/adobe/reader/unix/8.x/8.1.7/enu/.
fetch: AdobeReader_enu-8.1.7-1.i486.tar.bz2: local modification time does not match remote
=> Attempting to fetch from ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/distfiles/acroread/.
fetch: ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/distfiles/acroread/AdobeReader_enu-8.1.7-1.i486.tar.bz2: File unavailable (e.g., file not found, no access)
=> Couldn't fetch it - please try to retrieve this
=> port manually into /usr/ports/distfiles/acroread and try again.
*** Error code 1

Stop in /usr/ports/print/acroread8.
*** Error code 1

Stop in /usr/ports/print/acroread8.
======================================================

solusi:
kopril# make distclean