generate and include PDF versions of the docs in the release archive

docs/Makefile.am

@@ -12,16 +12,20 @@ HTMLPAGES = \
 	curl.html \
 	curl-config.html
 
+PDFPAGES = \
+	curl.pdf \
+	curl-config.pdf
+
 SUBDIRS = examples libcurl
 
 EXTRA_DIST = MANUAL BUGS CONTRIBUTE FAQ FEATURES INTERNALS		\
 	     README.win32 RESOURCES TODO TheArtOfHttpScripting THANKS	\
 	     VERSIONS KNOWN_BUGS BINDINGS $(man_MANS) $(HTMLPAGES) \
-	     HISTORY INSTALL libcurl-the-guide
+	     HISTORY INSTALL libcurl-the-guide $(PDFPAGES)
 
 MAN2HTML= gnroff -man $< | man2html >$@
 
-SUFFIXES = .1 .3 .html
+SUFFIXES = .1 .3 .html .pdf
 
 html: $(HTMLPAGES)
 	cd libcurl; make html
@@ -31,3 +35,13 @@ html: $(HTMLPAGES)
 
 .1.html:
 	$(MAN2HTML)
+
+MAN2PDF = groff -Tps -man curl.1 $< >$@
+
+pdf:
+	for file in $(man_MANS); do \
+	  foo=`echo $$file | sed -e 's/\.[0-9]$$//g'`; \
+	  groff -Tps -man $$file >$$foo.ps; \
+	  ps2pdf $$foo.ps $$foo.pdf; \
+	done
+	cd libcurl; make pdf