What library do I need?

g_strings

I was trying to use gcj to compile, however, I got the error message like below:
........................................................................
debian:/home/zak# gcj
gcj: libgcj.spec: 没有那个文件或目录 No such file or directory
........................................................................

And I have installed gcj3.3 libgcj4  libgcj4-awt  libgcj4-common

What is required more?

Thanks