diff --git a/.github/workflows/srt.yml b/.github/workflows/srt.yml
index 31ee1d131..98e97978e 100644
--- a/.github/workflows/srt.yml
+++ b/.github/workflows/srt.yml
@@ -28,7 +28,7 @@ jobs:
       LDFLAGS: "-L/usr/lib/x86_64-linux-gnu -lnetcdf -lnetcdff -lpnetcdf"     
       # Versions of all dependencies can be updated here
       ESMF_VERSION: v8.8.0
-      PARALLELIO_VERSION: pio2_6_5
+      PARALLELIO_VERSION: pio2_6_6
       CIME_MODEL: cesm
       CIME_DRIVER: nuopc
       GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
diff --git a/cime_config/buildnml b/cime_config/buildnml
index 7ffc28f82..692e30e54 100755
--- a/cime_config/buildnml
+++ b/cime_config/buildnml
@@ -7,7 +7,7 @@ _CIMEROOT = os.environ.get("CIMEROOT")
 if _CIMEROOT is None:
     raise SystemExit("ERROR: must set CIMEROOT environment variable")
 
-sys.path.append(os.path.join(_CIMEROOT, "scripts", "Tools"))
+sys.path.append(os.path.join(_CIMEROOT, "CIME", "Tools"))
 
 import shutil, glob, itertools
 from standard_script_setup import *
@@ -628,6 +628,26 @@ def compare_drv_flds_in(first, second, infile1, infile2):
                 % (infile1, infile2),
             )
 
+def cmeps_lib_list(case):
+    # provide a list of support libs that must be built for this case
+    # should be ordered with dependent libraries listed after those depended on
+    # the library names should match the keys in variable BUILD_LIB_FILE from config_files.xml
+    ufs_driver = os.environ.get("UFS_DRIVER")
+    if ufs_driver:
+        logger.info("UFS_DRIVER is set to {}".format(ufs_driver))
+
+    libs = case.get_values("CASE_SUPPORT_LIBRARIES")
+
+    mpilib = case.get_value("MPILIB")
+    if mpilib == "mpi-serial":
+        libs.insert(0, mpilib)
+        
+    ocn_model = case.get_value("COMP_OCN")
+    # These will be handled by MOM and CAM, included here for backward compatibility.  
+    atm_dycore = case.get_value("CAM_DYCORE")
+    if (ocn_model == "mom" or (atm_dycore and atm_dycore == "fv3")) and "FMS" not in libs:
+        libs.append("FMS")
+    return libs
 
 ###############################################################################
 def buildnml(case, caseroot, component):
@@ -635,6 +655,9 @@ def buildnml(case, caseroot, component):
     if component != "drv":
         raise AttributeError
 
+    libs = cmeps_lib_list(case)
+    case.set_value("CASE_SUPPORT_LIBRARIES", ",".join(libs))
+    
     esmfmkfile = os.getenv("ESMFMKFILE")
     expect(
         esmfmkfile and os.path.isfile(esmfmkfile),
@@ -725,7 +748,7 @@ def buildnml(case, caseroot, component):
 def _main_func():
     caseroot = parse_input(sys.argv)
 
-    with Case(caseroot) as case:
+    with Case(caseroot, read_only=False) as case:
         buildnml(case, caseroot, "drv")
 
 
diff --git a/cime_config/config_component.xml b/cime_config/config_component.xml
index 5323b5df2..e2023a1a8 100644
--- a/cime_config/config_component.xml
+++ b/cime_config/config_component.xml
@@ -2522,10 +2522,22 @@
    <desc>Remote git repository used for this case</desc>
  </entry>
 
-<!-- ===================================================================== -->
-  <!-- Include the AOFLUX calculation for this compset -->
-  <!-- ===================================================================== -->
+ <entry id="CASE_SUPPORT_LIBRARIES">
+   <type>char</type>
+   <default_value></default_value>
+   <values>
+     <value cime_model="cesm">gptl,pio,csm_share,FTorch,CDEPS</value>
+   </values>
+   <group>build_def</group>
+   <file>env_build.xml</file>
+   <desc>Support libraries required</desc>
+ </entry>
 
+ 
+ <!-- ===================================================================== -->
+ <!-- Include the AOFLUX calculation for this compset -->
+ <!-- ===================================================================== -->
+ 
  <entry id="ADD_AOFLUX_TO_RUNSEQ">
    <type>logical</type>
    <valid_values>TRUE,FALSE</valid_values>