Refine RPM package building spec file.

Add /sbin/ldconfig into RPM package install operations.

pkg/redhat/nccl.spec.in

@@ -7,6 +7,7 @@ Group:          Development/Libraries
 License:        BSD
 URL:            http://developer.nvidia.com/nccl
 Source0:        nccl_${nccl:Major}.${nccl:Minor}.${nccl:Patch}${nccl:Suffix}-${pkg:Revision}+cuda${cuda:Major}.${cuda:Minor}_${pkg:Arch}.txz
+Prereq:         /sbin/ldconfig
 
 %description
 NCCL (pronounced "Nickel") is a stand-alone library of standard collective
@@ -50,6 +51,12 @@ ln -s libnccl.so.${nccl:Major} $RPM_BUILD_ROOT/%{_libdir}/libnccl.so
 # static
 install -m 644 lib/libnccl_static.a $RPM_BUILD_ROOT/%{_libdir}
 
+%post -p /sbin/ldconfig
+%postun -p /sbin/ldconfig
+
+%post devel -p /sbin/ldconfig
+%postun devel -p /sbin/ldconfig
+
 %clean
 rm -rf $RPM_BUILD_ROOT