diff -Naur vapoursynth-R51.old/Makefile.am vapoursynth-R51/Makefile.am
--- vapoursynth-R51.old/Makefile.am	2021-03-23 14:27:12.519657875 +0100
+++ vapoursynth-R51/Makefile.am	2021-03-23 14:27:19.806783602 +0100
@@ -79,7 +79,7 @@
 
 pkgconfig_DATA += pc/vapoursynth.pc
 
-libvapoursynth_la_LDFLAGS = -no-undefined -avoid-version
+libvapoursynth_la_LDFLAGS = -no-undefined -version-info $(PACKAGE_VERSION)
 libvapoursynth_la_CPPFLAGS = $(ZIMG_CFLAGS) -DVS_PATH_PLUGINDIR='"$(PLUGINDIR)"'
 libvapoursynth_la_LIBADD = $(ZIMG_LIBS) $(DLOPENLIB) libexprfilter.la