can't make subsys - /usr/bin/ld: cannot find -lz

[morrofino]

Having an issue when trying to make subsys folder:

gcc -DLINUX=1 -DGCC=1 -DDEBUG -DHAS_FLOAT=1 -Wall -Wno-long-long -Wformat-y2k -Winit-self -Wswitch-default -Wunused-parameter -Wextra -Wundef -Wshadow -Wpointer-arith -Wwrite-strings -Wbad-function-cast -Wcast-qual -Waggregate-return -Wstrict-prototypes -Wold-style-definition -Wmissing-prototypes -Wmissing-declarations -Wpacked -Winvalid-pch -Wredundant-decls -Wnested-externs -Winline -std=gnu99 -fPIC -O2 -lm ../../target/subsys/netconf-subsystem.o ../../target/ncx/send_buff.o -o ../../target/bin/netconf-subsystem -L/usr/lib -L../../target/lib -lxml2 -lrt -lz -lm
/usr/bin/ld: no se puede encontrar -lz
collect2: error: ld returned 1 exit status
Makefile:71: fallo en las instrucciones para el objetivo 'subsys'
make: *** [subsys] Error 1