build: apply the distcheck tricks used in xf86-input-evdev

With this change it is possible to complete "make distcheck" safely on the
module, as it no longer tries to write to system directories.

Since synaptics also installs a configuration file, xorg-conf-dir also
needs to be overridden during distcheck.

Signed-off-by: Diego Elio Pettenò <flameeyes@gmail.com>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

Makefile.am

@@ -18,6 +18,12 @@
 #  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) are
+# not writable; provide instead relative locations.
+DISTCHECK_CONFIGURE_FLAGS = \
+	--with-sdkdir='$${includedir}/xorg' \
+	--with-xorg-conf-dir='$${sysconfdir}/xorg'
+
 MAINTAINERCLEANFILES = ChangeLog INSTALL
 
 pkgconfigdir = $(libdir)/pkgconfig

configure.ac

@@ -146,6 +146,11 @@ if test "x$have_libxtst" = "xyes" ; then
 fi
 # -----------------------------------------------------------------------------
 
+# Workaround overriding sdkdir to be able to create a tarball when user has no
+# write permission in sdkdir. See DISTCHECK_CONFIGURE_FLAGS in Makefile.am
+AC_ARG_WITH([sdkdir], [], [sdkdir="$withval"])
+AC_SUBST([sdkdir])
+
 AC_CONFIG_FILES([Makefile
                 xorg-synaptics.pc])
 AC_OUTPUT