configure: Automatically detect the default xorg-module-dir.

The module directory has changed to a per ABI folder in the xlibre-xserver.
Now the default value of `xorg-module-dir` will be detected from the `moduledir` variable in xorg-server.pc.

Signed-off-by: b-aaz <b-aazbsd.proton.me>

Makefile.am

@@ -18,6 +18,11 @@
 #  IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 #  CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
+# During distcheck, system locations (as provided by pkg-config) may
+# not be writable; provide instead relative locations.
+DISTCHECK_CONFIGURE_FLAGS = --with-xorg-module-dir='$${libdir}/xorg/modules' \
+                            --with-sdkdir='$${includedir}/xorg'
+
 SUBDIRS = include src man
 MAINTAINERCLEANFILES = ChangeLog INSTALL
 
@@ -34,9 +39,6 @@ ChangeLog:
 
 dist-hook: ChangeLog INSTALL
 
-# Provide an sdk location that is writable by this module
-DISTCHECK_CONFIGURE_FLAGS = --with-sdkdir='$${includedir}/xorg'
-
 if LINT
 # Check source code with tools like lint & sparse
 lint:

configure.ac

@@ -51,11 +51,12 @@ AC_CHECK_FUNCS([asprintf timingsafe_memcmp])
 PKG_CHECK_MODULES(XORG, [xorg-server >= 1.10 xproto >= 7.0.27 inputproto])
 
 # Define a configure option for an alternate input module directory
+PKG_PROG_PKG_CONFIG([0.25])
 AC_ARG_WITH(xorg-module-dir,
             AS_HELP_STRING([--with-xorg-module-dir=DIR],
-                           [Default xorg module directory [[default=$libdir/xorg/modules]]]),
+                           [Default xorg module directory]),
             [moduledir="$withval"],
-            [moduledir="$libdir/xorg/modules"])
+            [moduledir=`$PKG_CONFIG --variable=moduledir xorg-server`])
 inputdir=${moduledir}/input
 AC_SUBST(inputdir)