[Asterisk-Dev] CVS complile error on rh9

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pbx_dundi.c:54:18: zlib.h: No such file or directory
pbx_dundi.c: In function `update_key':
pbx_dundi.c:1314: warning: implicit declaration of function `crc32'
pbx_dundi.c: In function `dundi_decrypt':
pbx_dundi.c:1370: warning: implicit declaration of function `uncompress'
pbx_dundi.c:1370: `Z_OK' undeclared (first use in this function)
pbx_dundi.c:1370: (Each undeclared identifier is reported only once
pbx_dundi.c:1370: for each function it appears in.)
pbx_dundi.c: In function `dundi_encrypt':
pbx_dundi.c:1395: warning: implicit declaration of function `compress'
pbx_dundi.c:1396: `Z_OK' undeclared (first use in this function)
make[1]: *** [pbx_dundi.o] Error 1
make[1]: Leaving directory `/usr/src/asterisk/pbx'
make: *** [subdirs] Error 1