Libraries have been installed in: /usr/local/lib

编译一个程序，
./configure
make
两步都通过了，make install 报错

Libraries have been installed in:
/usr/local/lib

If you ever happen to want to link against installed libraries
in a given directory, LIBDIR, you must either use libtool, and
specify the full pathname of the library, or use the `-LLIBDIR'
flag during linking and do at least one of the following:

• add LIBDIR to the `LD_LIBRARY_PATH' environment variable
  during execution

• add LIBDIR to the `LD_RUN_PATH' environment variable
  during linking

• use the `-Wl,-rpath -Wl,LIBDIR' linker flag

• have your system administrator add LIBDIR to `/etc/ld.so.conf'

请问，如何处理？

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这个不是错误。但是如果忽略的话，很可能白装了。
一般Linux系统缺省不会去/usr/local/lib找库文件。所以才有上面的警告。除了把该路径加入ldconfig之外，另外一个办法是用

./configure --prefix=/usr

来指定安装到缺省路径。（有个风险：别覆盖了系统原有的东西）

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哪里有报错？

这是告诉你接下来要怎么用。简单的办法是在 /etc/ld.so.conf.d 下新建一个文件 local.conf，里边写上 /usr/local/lib。然后以 root 权限执行 ldconfig。这样你的系统才会找得到安装到 /usr/local/lib 下的库文件。