* configure.in: If we found X on our own, set C_SWITCH_X_SITE and
LD_SWITCH_X_SITE and assume --with-x11. Only look for X11 files if we weren't told about a window system or if we were told to use X11 but not told where. Search the libraries from the s and/or m files when checking for functions. * configure.in: Remove any trailing slashes in prefix and exec_prefix.
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