求助安装smthbbs-1.2.tar.gz时出错：
./configure --prefix=/usr/local/apache2/htdocs/bbs --enable-site=devel --enable-www --with-www=/usr/local/apache2 --with-php=/usr/local/php5/include/php --with-mysql=/usr/local/mysql 通过
   make时出错
  ../src/vars.h:43: error: array type has incomplete element type
../src/vars.h:47: error: array type has incomplete element type
../src/vars.h:48: error: array type has incomplete element type
../src/vars.h:49: error: array type has incomplete element type
../src/vars.h:50: error: array type has incomplete element type
../src/vars.h:51: error: array type has incomplete element type
make[2]: *** [f_cat.lo] Error 1
make[1]: *** [all-recursive] Error 1
make: *** [all] Error 2
   下面是gcc版本信息
   gcc --version
gcc (GCC) 4.1.2 (Ubuntu 4.1.2-0ubuntu4)
Copyright (C) 2006 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  
  请问大虾们，这是怎么回事？怎样才能通过安装
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