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