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Taken from here:
https://github.com/NixOS/nixpkgs/blob/master/pkgs/development/tools/documentation/gtk-doc/respect-xml-catalog-files-var.patch.
--- a/m4/gtkdoc_jh_check_xml_catalog.m4
+++ b/m4/gtkdoc_jh_check_xml_catalog.m4
@@ -5,8 +5,8 @@
[
AC_REQUIRE([JH_PATH_XML_CATALOG],[JH_PATH_XML_CATALOG(,[:])])dnl
AC_MSG_CHECKING([for ifelse([$2],,[$1],[$2]) in XML catalog])
- if $jh_found_xmlcatalog && \
- AC_RUN_LOG([$XMLCATALOG --noout "$XML_CATALOG_FILE" "$1" >&2]); then
+ # empty argument forces libxml to use XML_CATALOG_FILES variable
+ if AC_RUN_LOG([$XMLCATALOG --noout "" "$1" >&2]); then
AC_MSG_RESULT([found])
ifelse([$3],,,[$3])
else
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