I managed to get Spriter Pro working on Ubuntu 18.04 Bionic Beaver
TLDR; compiled gstreamer-0.10.36 and gst-plugins-base-0.10.36 and copied required libraries to the Spriter directory
Download the source files from https://launchpad.net/ubuntu/+source/gstreamer0.10/0.10.36-1.5ubuntu1 and https://packages.ubuntu.com/source/xenial/gst-plugins-base0.10
compile gstreamer0.10 - run
$> ./configure
this should complete successfully then run
$> make
this gave me an error at line 67 in gst/parse/grammar.tab.c, this is actually only an issue at line 1824 where the function requires 2 arguments and only one is given, just add a second argument of 0 to the yylex function
yychar = yylex (&yylval);
yychar = yylex (&yylval, 0);
then run make again, and this should complete with warnings but without error as it did for me
compile gst-plugins-base-0.10.36 run
$> export PKG_CONFIG_PATH=<path to gstreamer-0.10.36>/pkgconfig
$> ./configure
copy the needed libraries from gstream-0.10.36 and gst-plugins-base-0.10.36 to the Spirter directory (for me it was ~/.steam/steam/steamapps/common/Spriter )
as you try to run spriter it will tell you each of the libraries that are missing for me it was
./gst-plugins-base-0.10.36/gst-libs/gst/app/.libs/libgstapp-0.10.so.0
./gstreamer-0.10.36/libs/gst/base/.libs/libgstbase-0.10.so.0
./gst-plugins-base-0.10.36/gst-libs/gst/interfaces/.libs/libgstinterfaces-0.10.so.0
./gst-plugins-base-0.10.36/gst-libs/gst/pbutils/.libs/libgstpbutils-0.10.so.0
./gstreamer-0.10.36/gst/.libs/libgstreamer-0.10.so.0
./gst-plugins-base-0.10.36/gst-libs/gst/video/.libs/libgstvideo-0.10.so.0
$> cp ./gst-plugins-base-0.10.36/gst-libs/gst/app/.libs/libgstapp-0.10.so.0 ./gstreamer-0.10.36/libs/gst/base/.libs/libgstbase-0.10.so.0 ./gst-plugins-base-0.10.36/gst-libs/gst/interfaces/.libs/libgstinterfaces-0.10.so.0 ./gst-plugins-base-0.10.36/gst-libs/gst/pbutils/.libs/libgstpbutils-0.10.so.0 ./gstreamer-0.10.36/gst/.libs/libgstreamer-0.10.so.0 ./gst-plugins-base-0.10.36/gst-libs/gst/video/.libs/libgstvideo-0.10.so.0 ~/.steam/steam/steamapps/common/Spriter
after that make sure steam is running and Spriter should work