Is this a different build with the same error? I ask because the last build you showed me was linking libraries in /home/asampath/CESM/caseout/lib and this one has them in /home/asampath/CESM/cesm1_2_0/scripts/mycase_T31_IRCP85CN/bld/libIn either case verify that libgptl.a is there and that the link step is finding this library.