Fix MKWS-296 ("PDF versions of documents do not build on Debian 6.0")

To generate PDFs, we now use markdown2pdf when that exists (as it does
alongside old versions of pandoc); otherwise we use pandoc itself
(which in more recent versions does PDF output on its own).

diff --git a/doc/Makefile b/doc/Makefile
index 461a904..c168a76 100644 (file)
--- a/doc/Makefile
+++ b/doc/Makefile
@@ -3,6 +3,9 @@
 # To build the PDFs, you will need these Debian packages:
 #      texlive-latex-recommended texlive-latex-extra texlive-fonts-recommended
 
+# Older versions of pandoc don't do PDF output, but have a companion program
+MARKDOWN2PDF = $(shell which markdown2pdf pandoc)
+
 DOCS = index.html index.pdf \
        mkws-manual.html mkws-manual.pdf \
        mkws-developer.html mkws-developer.pdf \
@@ -33,7 +36,7 @@ all: $(INSTALLED)
 #      texlive-latex-recommended
 ../tools/htdocs/%.pdf: %.markdown
        rm -f $@
-       pandoc --standalone $< -o $@
+       $(MARKDOWN2PDF) --standalone $< -o $@
        chmod ugo-w $@
 
 clean: