Revert 0ecf26fc7d2f24570b4c04a668c437b8656a40a7, since it
makes PDF creation fail on SUSE <= 12.2.

(cannot find linuxdoc-sgml.sty; seems like /usr/lib/sgml-tool
is not in the search path with texlive 2011/suse122.)

diff --git a/doc/Makefile b/doc/Makefile
index b92957e..1df6081 100644
--- a/doc/Makefile
+++ b/doc/Makefile
@@ -6,7 +6,7 @@ PSFILES=ip-cref.ps ip-tunnels.ps api-ip6-flowlabels.ps ss.ps nstat.ps arpd.ps rt
 
 LATEX=latex
 DVIPS=dvips
-SGML2DVI=sgml2latex
+SGML2DVI=sgml2latex --output=dvi
 SGML2HTML=sgml2html -s 0
 LPR=lpr -Zsduplex
 SHELL=bash
@@ -31,11 +31,8 @@ pdf: $(PDFFILES)
 print: $(PSFILES)
 	$(LPR) $(PSFILES)
 
-%.tex: %.sgml
-	$(SGML2DVI) --output=tex $<
-
 %.dvi: %.sgml
-	$(SGML2DVI) --output=dvi $<
+	$(SGML2DVI) $<
 
 %.dvi: %.tex
 	@set -e; pass=2; echo "Running LaTeX $<"; \
@@ -47,17 +44,10 @@ print: $(PSFILES)
 		echo "Re-running LaTeX $<, $${pass}d pass"; pass=$$[$$pass + 1]; \
 	done
 
-%.pdf: %.tex
-	@set -e; pass=2; echo "Running pdfLaTeX $<"; \
-	while [ `pdflatex $< </dev/null 2>&1 | \
-		 grep -c '^\(LaTeX Warning: Label(s) may\|No file \|! Emergency stop\)'` -ge 1 ]; do \
-		if [ $$pass -gt 3 ]; then \
-			echo "Seems, something is wrong. Try by hands." ; exit 1 ; \
-		fi; \
-		echo "Re-running pdfLaTeX $<, $${pass}d pass"; pass=$$[$$pass + 1]; \
-	done
-#%.pdf: %.ps
-#	ps2pdf $<
+#%.pdf: %.tex
+#	pdflatex $<
+%.pdf: %.ps
+	ps2pdf $<
 
 %.ps: %.dvi
 	$(DVIPS) $< -o $@