diff --git a/xsane.spec b/xsane.spec
index cd1d505..0f0c16a 100644
--- a/xsane.spec
+++ b/xsane.spec
@@ -1,14 +1,14 @@
 Name: xsane
 Summary: An X Window System front-end for the SANE scanner interface.
 Version: 0.77
-Release: 3
+Release: 4
 Source: http://www.xsane.org/download/%{name}-%{version}.tar.gz
 License: GPL
 URL: http://www.xsane.org/
 Group: Applications/Multimedia
 Buildroot: %{_tmppath}/%{name}-buildroot
 Requires: sane-backends >= 1.0.5-3
-BuildPrereq: sane-backends-devel gimp-devel
+BuildPrereq: sane-backends-devel gimp-devel libpng-devel libjpeg-devel
 ExcludeArch: s390 s390x
 
 %description
@@ -98,6 +98,9 @@ if [ $1 = 0 ]; then
 fi
 
 %changelog
+* Tue Jul 24 2001 Tim Waugh <twaugh@redhat.com> 0.77-4
+- Build requires libpng-devel, libjpeg-devel (#bug 49760).
+
 * Tue Jul 17 2001 Preston Brown <pbrown@redhat.com> 0.77-3
 - add an icon to the desktop entry