diff --git a/tk.changes b/tk.changes
index ca845d1..f267620 100644
--- a/tk.changes
+++ b/tk.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Mon Dec  8 17:13:38 CET 2008 - max@suse.de
+
+- Added an explicit requirement for xorg-x11-libX11-devel, because
+  tk.h needs some of the header files.
+
 -------------------------------------------------------------------
 Wed Oct 15 17:00:08 CEST 2008 - max@suse.de
 
diff --git a/tk.spec b/tk.spec
index eb00f6a..eb25966 100644
--- a/tk.spec
+++ b/tk.spec
@@ -22,7 +22,7 @@ Name:           tk
 BuildRequires:  tcl-devel xorg-x11-devel
 Url:            http://www.tcl.tk
 Version:        8.5.5
-Release:        1
+Release:        2
 BuildRoot:      %{_tmppath}/%{name}-%{version}-build
 Summary:        Graphical User Interface Toolkit for Tcl
 License:        BSD 3-Clause
@@ -54,7 +54,9 @@ Authors:
 Group:          Development/Libraries/Tcl
 License:        BSD 3-Clause
 Summary:        Header Files and C API Documentation for Tk
-Requires:       tk = %version, tcl-devel
+Requires:       tk = %version
+Requires:       tcl-devel
+Requires:       xorg-x11-libX11-devel
 
 %description devel
 This package contains header files and documentation needed for writing
@@ -128,6 +130,9 @@ exit 0
 %_libdir/tkConfig.sh
 
 %changelog
+* Mon Dec 08 2008 max@suse.de
+- Added an explicit requirement for xorg-x11-libX11-devel, because
+  tk.h needs some of the header files.
 * Wed Oct 15 2008 max@suse.de
 - Bugfix release 8.5.5:
   * fix [tk_getOpenFile -multiple 1] on unix