[knot-dns-users] Problem instaling KNOT

Hello, I'm new to KNOT and I'm trying to install it on a CentOS 6.3 (Final) minimal install, I already updated openssl to the newest version and install all the pre-requirements but when I run make command I get the following error: ************************* BINDIR=\"/usr/local/sbin\" -g -O2 -fpredictive-commoning -I/usr/local/include -mmmx -msse -msse2 -msse3 -MT journal.lo -MD -MP -MF .deps/journal.Tpo -c knot/server/journal.c -fPIC -DPIC -o .libs/journal.o In file included from knot/server/journal.c:26: ./common/crc.h:30:18: error: zlib.h: No such file or directory In file included from knot/server/journal.c:26: ./common/crc.h: In function 'crc_init': ./common/crc.h:49: warning: implicit declaration of function 'adler32' make[2]: *** [journal.lo] Error 1 make[2]: Leaving directory `/root/knot-1.0.6/src' make[1]: *** [all] Error 2 make[1]: Leaving directory `/root/knot-1.0.6/src' make: *** [all-recursive] Error 1 ************************* Can any of you guys help me? Best regards, -- Eduardo Duarte SIT-DNS DNS.PT - https://www.dns.pt/ FCCN - http://www.fccn.pt/