From 599cf81a1bcc9dbbe5e9a088b766ca8af662be1c Mon Sep 17 00:00:00 2001
From: Ian Abbott <abbotti@mev.co.uk>
Date: Wed, 19 Dec 2007 11:44:16 +0000
Subject: [PATCH] Define datarootdir, docdir, htmldir and pdfdir if not defined
 by autoconf (first defined in autoconf-2.59c).

---
 configure.ac | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/configure.ac b/configure.ac
index 1acc52e..bc9f62d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -48,6 +48,27 @@ COMEDILIB_LIBS="$COMEDILIB_LIBS \$(top_builddir)/lib/libcomedi.la -lm"
 AC_SUBST(COMEDILIB_CFLAGS)
 AC_SUBST(COMEDILIB_LIBS)
 
+# autoconf backwards compatibility
+if test "$datarootdir" = ""; then
+	datarootdir='${datadir}'
+	AC_SUBST(datarootdir)
+fi
+
+if test "$docdir" = ""; then
+	docdir='${datarootdir}/doc/${PACKAGE}'
+	AC_SUBST(docdir)
+fi
+
+if test "$htmldir" = ""; then
+	htmldir='${docdir}'
+	AC_SUBST(htmldir)
+fi
+
+if test "$pdfdir" = ""; then
+	pdfdir='${docdir}'
+	AC_SUBST(pdfdir)
+fi
+
 #swig
 AC_PATH_PROG(SWIG, swig, "no")
 if test "$SWIG" == "no" ; then
-- 
2.26.2