problem building webalizer

[Richard B. Pyne]

  config.status: creating Makefile
config.status: linking ./lang/webalizer_lang.english to webalizer_lang.h
configure: Done.  Type 'make' to continue with build.
+ running "default_make"
gcc -O2 -march=native -pipe -O2 -march=native -pipe  -DETCDIR=\"/etc\" 
-DGEODB_LOC=\"/usr/share/GeoDB\" -DPACKAGE_NAME=\"webalizer\" 
-DPACKAGE_TARNAME=\"webalizer\" -DPACKAGE_VERSION=\"2.20\" 
-DPACKAGE_STRING=\"webalizer\ 2.20\" -DPACKAGE_BUGREPORT=\"\" 
-D_FILE_OFFSET_BITS=64 -DSTDC_HEADERS=1 -DHAVE_SYS_TYPES_H=1 
-DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 
-DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 -DHAVE_INTTYPES_H=1 
-DHAVE_STDINT_H=1 -DHAVE_UNISTD_H=1 -DHAVE_GETOPT_H=1 -DHAVE_MATH_H=1  
-c webalizer.c
In file included from /usr/include/zlib.h:34:0,
                  from webalizer.c:44:
/usr/include/zconf.h:373:6: error: token "=" is not valid in 
preprocessor expressions
make: *** [webalizer.o] Error 1
Creating /var/log/lunar/compile/webalizer-2.21-02.bz2
! Problem detected during BUILD