Setting library directories in configure scripts

I want to compile vim on a 64 bit Linux server. On this machine, all basic directories are on a common network drive. 32 bit libraries are stored in .../lib, and 64 bit libraries in .../lib64.

When I run the configure script, it finds that X11 is in /usr/X11R6, and adds -L/usr/X11R6/lib to the linker flags. Of course it won't compile, because the 64 bit开发者_如何学C libraries are in /usr/X11R6/lib64.

I tried setting the environment variable LDIRS=-L/usr/X11R6/lib64 before running configure. It didn't help, because in the linking phase, it preceded -L/usr/X11R6/lib to my LDFLAGS variable, so it still wanted to find the library files in the wrong directory.

Is there any way to force the configure script to find library files on a particular location?