xml2-config and xslt-config editing

I have found that I need to edit the xml2-config and xslt-config file after doing a build.
Much the same as freetype.
Would anyone have any objections to this being done? $(LIBXSLT_HOOK_POST_INSTALL):

	$(SED) "s,^prefix=.*,prefix=\'$(STAGING_DIR)/usr\',g"
$(STAGING_DIR)/usr/bin/xslt-config
	$(SED) "s,^exec_prefix=.*,exec_prefix=\'$(STAGING_DIR)/usr\',g"
$(STAGING_DIR)/usr/bin/xslt-config
	$(SED) "s,^includedir=.*,includedir=\'$(STAGING_DIR)/usr/include\',g"
$(STAGING_DIR)/usr/bin/xslt-config
	$(SED) "s,^libdir=.*,libdir=\'$(STAGING_DIR)/usr/lib\',g"

$(STAGING_DIR)/usr/bin/xslt-config
touch $@

Similar for xml2-config

Finally,
Would it be too dangerous to in Makefile.autotools.in do the above on all /usr/bin/*-config. Is it better to have this done on a per package basis or hidden?

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