diff --git a/netcdf.spec b/netcdf.spec
index f9e6901..0915473 100644
--- a/netcdf.spec
+++ b/netcdf.spec
@@ -195,7 +195,7 @@ m4 libsrc/ncx.m4 > libsrc/ncx.c
            --enable-dap \\\
            --enable-extra-example-tests \\\
            CPPFLAGS=-I%{_includedir}/hdf \\\
-           LIBS="-ldf -ljpeg" \\\
+           LIBS="-ldf -ljpeg -ltirpc" \\\
            --enable-hdf4 \\\
            --disable-dap-remote-tests \\\
 %{nil}