[nautilus-actions/file-manager-actions] Check for dblatex

[Pierre Wieser <pwieser src gnome org>]

commit e1298d2b95117b994b12e1b5bcc044c3bd3f4441
Author: Pierre Wieser <pwieser trychlos org>
Date:   Fri Sep 18 00:33:02 2015 +0200

    Check for dblatex

 m4/fma-enable-manuals.m4 |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)
---
diff --git a/m4/fma-enable-manuals.m4 b/m4/fma-enable-manuals.m4
index a781d4c..ca270ae 100644
--- a/m4/fma-enable-manuals.m4
+++ b/m4/fma-enable-manuals.m4
@@ -111,6 +111,14 @@ AC_DEFUN([_AC_ARG_FMA_ENABLE_PDF_MANUALS],[
                        [build PDF user's manuals @<:@dblatex@:>@]),
                        [enable_pdf_manuals=$enableval],
                        [enable_pdf_manuals="no"])
+       dnl
+       dnl Check for dblatex/fop (for pdf output)
+       dnl from https://github.com/GNOME/gtk-doc/blob/master/configure.ac
+       dnl
+       AC_PATH_PROG([DBLATEX], [dblatex])
+       if test -z "$DBLATEX"; then
+               AC_MSG_WARN([dblatex not found, so no pdf output from xml])
+       fi
 ])
 
 AC_DEFUN([_CHECK_FOR_PDF_MANUALS],[