-all:
- rm -f INSTALL/*.html
- makeinfo --html --document-language=de_DE INSTALL.texi
- makeinfo --plaintext --document-language=de_DE -o INSTALL.txt INSTALL.texi
+# The Installation Documentation is being written in 'INSTALL.texi' using
+# the texinfo syntax. Visit http://www.gnu.org/software/texinfo/ and
+# http://mirrors.ctan.org/macros/texinfo/texinfo/doc/refcard/txirefcard.pdf
+#
+# In order to generate the text, HTML and PDF versions of this
+# documentation you have to install the 'make' and 'textinfo' packages
+# of your operating system.
+#
+# Usage:
+# cd doc/
+# make
+
+all: INSTALL.txt Lx-Office_Installation_DE.pdf
+
+%.txt: %.texi
+ makeinfo --html --document-language=de_DE.UTF-8 -o $(patsubst %.txt,%.html,$@) --no-split $^
+ makeinfo --plaintext --document-language=de_DE.UTF-8 -o $@ $^
+
+Lx-Office_Installation_DE.pdf: INSTALL.texi
+ texi2pdf -p -c -q -o $@ $^