graphics/darktable: Use cmake rpath support.

Signed-off-by: B. Watson <urchlay@slackware.uk>

Signed-off-by: Willy Sudiarto Raharjo <willysr@slackbuilds.org>

graphics/darktable/darktable.SlackBuild

@@ -22,11 +22,14 @@
 #  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 #  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+# 20230510 bkw: use cmake rpath support, so lensfun03 doesn't need
+# /etc/ld.so.conf.d/ any more.
+
 cd $(dirname $0) ; CWD=$(pwd)
 
 PRGNAM=darktable
 VERSION=${VERSION:-4.2.1}
-BUILD=${BUILD:-1}
+BUILD=${BUILD:-2}
 TAG=${TAG:-_SBo}
 PKGTYPE=${PKGTYPE:-tgz}
 # Slackware's lensfun isn't compatible
@@ -87,6 +90,8 @@ find -L . \
 mkdir -p build
 cd build
   cmake \
+    -DCMAKE_INSTALL_RPATH=/opt/$LENSFUN/lib$LIBDIRSUFFIX \
+    -DCMAKE_INSTALL_RPATH_USE_LINK_PATH=ON \
     -DCMAKE_C_FLAGS:STRING="$SLKCFLAGS" \
     -DCMAKE_CXX_FLAGS:STRING="$SLKCFLAGS" \
     -DCMAKE_INSTALL_PREFIX=/usr \