make -s  all-recursive
Making all in libsystem
  [Compiling f_cat.c]
  mkdir .libs
  gcc -DHAVE_CONFIG_H -I. -I. -I.. -I../src -DLINUX -I/usr/include/mysql -c f_cat.
  c -MT f_cat.lo -MD -MP -MF .deps/f_cat.TPlo  -fPIC -DPIC -o .libs/f_cat.lo
  In file included from ../src/bbs.h:486,
                   from ../src/system.h:3,
                   from f_cat.c:2:
            ../src/vars.h:39: error: array type has incomplete element type
            ../src/vars.h:43: error: array type has incomplete element type
            ../src/vars.h:44: error: array type has incomplete element type
            ../src/vars.h:45: error: array type has incomplete element type
            ../src/vars.h:46: error: array type has incomplete element type
            ../src/vars.h:47: error: array type has incomplete element type
    make[2]: *** [f_cat.lo] ## 1
    make[1]: *** [all-recursive] ## 1
    make: *** [all] ## 2

请问是什么原因
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