[impressive] clarify requirements

[mjg]

commit 83971ef94d8b3854c7f069ccb746e8742ee19062
Author: Michael J Gruber <mjg at fedoraproject.org>
Date:   Fri Mar 11 11:08:39 2011 +0100

    clarify requirements

 impressive.spec |   11 ++++++++++-
 1 files changed, 10 insertions(+), 1 deletions(-)
---
diff --git a/impressive.spec b/impressive.spec
index d60ea34..b021091 100644
--- a/impressive.spec
+++ b/impressive.spec
@@ -1,6 +1,6 @@
 Name:           impressive
 Version:        0.10.3
-Release:        4%{?dist}
+Release:        5%{?dist}
 Summary:        A program that displays presentation slides
 
 Group:          Applications/Productivity
@@ -13,12 +13,17 @@ Source1:        %{name}.sh
 BuildArch:      noarch
 BuildRequires:  python-devel
 # The following requires are not picked up by rpm:
+# - imported modules (required):
 Requires:       python-imaging
 Requires:       pygame
 Requires:       PyOpenGL
 Requires:       opengl-games-utils
+# - external tools for displaying and parsing pdf (required resp. strongly recommended):
 Requires:       xpdf
+Requires:	pdftk
+# - external tool for acting on links (recommended):
 Requires:       xdg-utils
+# - font for on screen display (recommended):
 Requires:       dejavu-sans-fonts
 
 
@@ -60,6 +65,10 @@ rm -rf %{buildroot}
 %{_mandir}/man1/impressive.1*
 
 %changelog
+* Fri Mar 11 2011 Michael J Gruber <mjg at fedorapproject.org> - 0.10.3-5
+- Clarify explicit requires.
+- Add pdftk as requirement.
+
 * Wed Feb 09 2011 Fedora Release Engineering <rel-eng at lists.fedoraproject.org> - 0.10.3-4
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_15_Mass_Rebuild