貼心的 libgmp

常在 $HOME 裡安裝一些自己需要的 library，剛好看到 libgmp 有個貼心的提醒：

..

	----------------------------------------------------------------------
	Libraries have been installed in:
	/home/qrtt1/app/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'
	See any operating system documentation about shared libraries for
	more information, such as the ld(1) and ld.so(8) manual pages.
	----------------------------------------------------------------------

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