Thanks to Daniel Leidert.
# value of ZIP_EXCLUDES is a space-separated list of any file or
# directory names (shell wildcards OK) that should be excluded
# from the zip file and tarball for the release
-DISTRIB_EXCLUDES = extensions/xsltproc doc/reference.txt$$ reference.txt.html$$ doc/reference.fo$$ doc/reference.pdf$$ doc/HTML.manifest$$ tools/xsl xhtml/html2xhtml.xsl README.RELEASE-BUILD
+DISTRIB_EXCLUDES = \
+ reference.txt.html$$ \
+ doc/reference.txt$$ \
+ doc/reference.fo$$ \
+ doc/reference.pdf$$ \
+ doc/HTML.manifest$$ \
+ tools/xsl \
+ xhtml/html2xhtml.xsl$$ \
+ README.RELEASE-BUILD \
+ .param.dbkns \
+ .param.stripped \
+ .param.xmlid \
+ .lib.dbkns \
+ .lib.stripped
# value of DISTRIB_PACKAGES is a space-separated list of any
# directory names that should be packaged as separate zip/tar