[PATCH xf86-input-libinput] Fix --with-xorg-conf-dir default value

[Michel Dänzer]

From: Michel Dänzer <michel.daenzer at amd.com>

If --prefix isn't specified on the command line, $prefix contains "NONE"
at this point, not the default prefix value. So make install would
attempt to install the xorg.conf.d snippet to
${DESTDIR}NONE/share/X11/xorg.conf.d/.

Avoid this by leaving ${prefix} verbatim in the default value, to be
resolved by make.

Signed-off-by: Michel Dänzer <michel.daenzer at amd.com>
---
 configure.ac | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/configure.ac b/configure.ac
index 4c72c75..4158e57 100644
--- a/configure.ac
+++ b/configure.ac
@@ -58,9 +58,9 @@ AC_SUBST(inputdir)
 
 AC_ARG_WITH(xorg-conf-dir,
             AC_HELP_STRING([--with-xorg-conf-dir=DIR],
-                           [Default xorg.conf.d directory [[default=$prefix/share/X11/xorg.conf.d/]]]),
+                           [Default xorg.conf.d directory [[default=${prefix}/share/X11/xorg.conf.d]]]),
             [xorgconfdir="$withval"],
-            [xorgconfdir="$prefix/share/X11/xorg.conf.d"])
+            [xorgconfdir='${prefix}/share/X11/xorg.conf.d'])
 AC_SUBST(xorgconfdir)
 
 # X Server SDK location is required to install header files
-- 
2.9.3