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diff -rupN --no-dereference giflib-5.2.1/doc/Makefile giflib-5.2.1-new/doc/Makefile
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--- giflib-5.2.1/doc/Makefile	2019-03-28 18:05:25.000000000 +0100
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+++ giflib-5.2.1-new/doc/Makefile	2020-02-17 16:51:04.489397582 +0100
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@@ -1,7 +1,7 @@
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 .SUFFIXES: .xml .html .txt .adoc .1
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 .xml.html:
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-	xmlto xhtml-nochunks $<
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+	xmlto --stringparam generate.consistent.ids=1 xhtml-nochunks $<
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 .xml.1:
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 	xmlto man $<