diff --git a/pari-2.5.0.tar.bz2 b/pari-2.5.0.tar.bz2
new file mode 100644
index 0000000..37430d7
--- /dev/null
+++ b/pari-2.5.0.tar.bz2
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:095229af7c263034614494fd553263a8852a4d33aa9864427e83c0296eb6b66b
+size 2212739
diff --git a/pari-2.5.0.tar.xz b/pari-2.5.0.tar.xz
deleted file mode 100644
index 7285cfc..0000000
--- a/pari-2.5.0.tar.xz
+++ /dev/null
@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:6efa4948dbdf82f4a26631b46a3154a01fa8ba2111304cc47b0629ad432a1b12
-size 1875552
diff --git a/pari.changes b/pari.changes
index 86f4079..3c40b9a 100644
--- a/pari.changes
+++ b/pari.changes
@@ -1,3 +1,10 @@
+-------------------------------------------------------------------
+Sun Feb 26 22:13:05 UTC 2012 - scorot@free.fr
+
+- fix build requirement to allow build on SLE-11
+- recompress source file to bzip2 format to allow build on SLE-11
+- add missing %%post and %%postun scriptlets 
+
 -------------------------------------------------------------------
 Mon Sep 26 08:52:28 UTC 2011 - jengelh@medozas.de
 
diff --git a/pari.spec b/pari.spec
index eb8cf5f..44d486c 100644
--- a/pari.spec
+++ b/pari.spec
@@ -24,9 +24,9 @@ Summary:	Computer Algebra System for fast computations in Number Theory
 License:        GPL-2.0
 URL:            http://pari.math.u-bordeaux.fr/
 
-Source:         %name-%version.tar.xz
+Source:         %name-%version.tar.bz2
 BuildRoot:      %{_tmppath}/%{name}-%{version}-build
-BuildRequires:	gmp-devel, readline-devel, pkgconfig(x11), xz
+BuildRequires:	gmp-devel, readline-devel, xorg-x11-devel
 BuildRequires:	fltk-devel, libqt4-devel
 
 %description
@@ -90,7 +90,12 @@ make %{?_smp_mflags} all \
 
 %install
 b="%buildroot";
+%if 0%{sles_version} <= 11
+%makeinstall
+%else
 %make_install
+%endif
+
 
 # Put library in the right spot and fix the SO version abuse
 if [ -L "$b/%_libdir/libpari-gmp.so.3" ]; then
@@ -101,6 +106,10 @@ ln -fs libpari-gmp.so.3 "$b/%_libdir/libpari-gmp-%version.so";
 ln -fs libpari-gmp-%version.so "$b/%_libdir/libpari-gmp.so";
 ln -fs libpari-gmp-%version.so "$b/%_libdir/libpari.so";
 
+%post -n %lname -p /sbin/ldconfig
+
+%postun -n %lname -p /sbin/ldconfig
+
 %files gp
 %defattr(-,root,root)
 %_bindir/*