-all:
-       xsltproc --xinclude --xincludestyle /usr/share/sgml/docbook/xsl-ns-stylesheets/html/chunk.xsl API.xml
+all: book
+       xsltproc --stringparam base.dir book/ --xinclude --xincludestyle /usr/share/sgml/docbook/stylesheet/xsl/docbook-xsl/html/chunk.xsl API.xml
+
+book:
+       mkdir book
 
 clean:
-       rm -f *html
+       rm book/*