diff --git a/libxcb.spec b/libxcb.spec
index f13d827..9593540 100644
--- a/libxcb.spec
+++ b/libxcb.spec
@@ -1,6 +1,6 @@
 Name:          libxcb
 Version:       1.11
-Release:       1mamba
+Release:       2mamba
 Summary:       The X protocol C-language Binding (XCB) is a replacement for Xlib
 Group:         System/X11
 Vendor:        openmamba
@@ -21,11 +21,11 @@ BuildRequires: doxygen
 BuildRequires: diffutils
 BuildRequires: /usr/bin/xsltproc
 BuildRequires: xcb-proto-devel
-%ifarch x86_64
-BuildRequires: gcc-multilib
-BuildRequires: glibc-multilib-devel
-BuildRequires: libXau-devel.i586
-%endif
+#%ifarch x86_64
+#BuildRequires: gcc-multilib
+#BuildRequires: glibc-multilib-devel
+#BuildRequires: libXau-devel.i586
+#%endif
 BuildRoot:     %{_tmppath}/%{name}-%{version}-root
 
 %description
@@ -35,6 +35,7 @@ The X protocol C-language Binding (XCB) is a replacement for Xlib  featuring a s
 Summary:       Devel package for %{name}
 Group:         Development/Libraries
 Requires:      %{name} = %{?epoch:%epoch:}%{version}-%{release}
+Requires:      libpthread-stubs-devel
 
 %description devel
 The X protocol C-language Binding (XCB) is a replacement for Xlib  featuring a small footprint, latency hiding, direct access to the protocol, improved threading support, and extensibility.
@@ -154,6 +155,9 @@ exit 0
 %endif
 
 %changelog
+* Wed Apr 29 2015 Davide Madrisan <davide.madrisan@gmail.com> 1.11-2mamba
+- the devel package requires libpthread-stubs-devel
+
 * Sat Aug 30 2014 Automatic Build System <autodist@mambasoft.it> 1.11-1mamba
 - automatic version update by autodist