diff --git a/Common_CS.mk b/Common_CS.mk
index c1b7be1..f67be31 100644
--- a/Common_CS.mk
+++ b/Common_CS.mk
@@ -45,7 +45,6 @@ MAKE_CLEAN_ARGUMENTS = *~ *.o *.mod *.il *.stb c_* *.so
 
 FF90_ALL_FLAGS   = -I$(MODDIR) -I. \
 		$(CGNS_INCLUDE_FLAGS) \
-		$(CGNS_VERSION_FLAG) \
 		$(FF90_GEN_FLAGS) \
 		$(FF90_OPT_FLAGS) \
 		$(PETSC_INCLUDE_FLAGS) \
diff --git a/Common_real.mk b/Common_real.mk
index 6e5cfbb..16c6aca 100644
--- a/Common_real.mk
+++ b/Common_real.mk
@@ -45,7 +45,6 @@ MAKE_CLEAN_ARGUMENTS = *~ *.o *.mod *.il *.stb c_* *.so
 
 FF90_ALL_FLAGS   =	-I$(MODDIR) \
 			$(CGNS_INCLUDE_FLAGS) \
-			$(CGNS_VERSION_FLAG) \
 			$(FF90_GEN_FLAGS) \
 			$(FF90_OPT_FLAGS) \
 			$(PETSC_INCLUDE_FLAGS)
diff --git a/config/defaults/config.LINUX_GFORTRAN_OPENMPI.mk b/config/defaults/config.LINUX_GFORTRAN_OPENMPI.mk
index 2ffcb22..e7dead2 100644
--- a/config/defaults/config.LINUX_GFORTRAN_OPENMPI.mk
+++ b/config/defaults/config.LINUX_GFORTRAN_OPENMPI.mk
@@ -11,15 +11,9 @@ CC   = mpicc
 
 
 # ------- Define CGNS Inlcude and linker flags -------------------------
-# Define the CNGS include directory and linking flags for CGNSlib. We
-# can use 3.2.x OR CGNS 3.3+. You must define which version is being
-# employed as shown below. We are assuming that HDF5 came from PETSc
-# so it is included in ${PETSC_LIB}. Otherwise you will have to
-# specify the HDF5 library.
-
-# ----------- CGNS ------------------
-# CGNS_VERSION_FLAG=               # for CGNS 3.2.x
-CGNS_VERSION_FLAG=-DUSECGNSMODULE  # for CGNS 3.3.x
+# Define the CGNS include directory and linking flags for the CGNS library.
+# We are assuming that HDF5 came from PETSc so it is included in ${PETSC_LIB}.
+# Otherwise you will have to specify the HDF5 library.
 CGNS_INCLUDE_FLAGS=-I$(CGNS_HOME)/include
 CGNS_LINKER_FLAGS=-L$(CGNS_HOME)/lib -lcgns
 
diff --git a/config/defaults/config.LINUX_INTEL_OPENMPI.mk b/config/defaults/config.LINUX_INTEL_OPENMPI.mk
index d76b9dd..f20c623 100644
--- a/config/defaults/config.LINUX_INTEL_OPENMPI.mk
+++ b/config/defaults/config.LINUX_INTEL_OPENMPI.mk
@@ -10,15 +10,9 @@ FF90 = mpif90
 CC   = mpicc
 
 # ------- Define CGNS Inlcude and linker flags -------------------------
-# Define the CNGS include directory and linking flags for CGNSlib. We
-# can use 3.2.x OR CGNS 3.3+. You must define which version is being
-# employed as shown below. We are assuming that HDF5 came from PETSc
-# so it is included in ${PETSC_LIB}. Otherwise you will have to
-# specify the HDF5 library.
-
-# ----------- CGNS ------------------
-# CGNS_VERSION_FLAG=               # for CGNS 3.2.x
-CGNS_VERSION_FLAG=-DUSECGNSMODULE  # for CGNS 3.3.x
+# Define the CGNS include directory and linking flags for the CGNS library.
+# We are assuming that HDF5 came from PETSc so it is included in ${PETSC_LIB}.
+# Otherwise you will have to specify the HDF5 library.
 CGNS_INCLUDE_FLAGS=-I$(CGNS_HOME)/include
 CGNS_LINKER_FLAGS=-L$(CGNS_HOME)/lib -lcgns
 
diff --git a/config/defaults/config.OSX_GFORTRAN_OPENMPI.mk b/config/defaults/config.OSX_GFORTRAN_OPENMPI.mk
index 146f9c3..521a64b 100644
--- a/config/defaults/config.OSX_GFORTRAN_OPENMPI.mk
+++ b/config/defaults/config.OSX_GFORTRAN_OPENMPI.mk
@@ -10,15 +10,9 @@ FF90 = mpif90
 CC   = mpicc
 
 # ------- Define CGNS Inlcude and linker flags -------------------------
-# Define the CNGS include directory and linking flags for CGNSlib. We
-# can use 3.2.x OR CGNS 3.3+. You must define which version is being
-# employed as shown below. We are assuming that HDF5 came from PETSc
-# so it is included in ${PETSC_LIB}. Otherwise you will have to
-# specify the HDF5 library.
-
-# ----------- CGNS ------------------
-# CGNS_VERSION_FLAG=               # for CGNS 3.2.x
-CGNS_VERSION_FLAG=-DUSECGNSMODULE  # for CGNS 3.3.x
+# Define the CGNS include directory and linking flags for the CGNS library.
+# We are assuming that HDF5 came from PETSc so it is included in ${PETSC_LIB}.
+# Otherwise you will have to specify the HDF5 library.
 CGNS_INCLUDE_FLAGS=-I$(CGNS_HOME)/include
 CGNS_LINKER_FLAGS=-L$(CGNS_HOME)/lib -lcgns
 
diff --git a/idwarp/__init__.py b/idwarp/__init__.py
index d6282e7..d53439e 100644
--- a/idwarp/__init__.py
+++ b/idwarp/__init__.py
@@ -1,4 +1,4 @@
-__version__ = "2.3.0"
+__version__ = "2.4.0"
 
 from .UnstructuredMesh import USMesh
 from .MultiUnstructuredMesh import MultiUSMesh
diff --git a/src/modules/cgnsGrid.F90 b/src/modules/cgnsGrid.F90
index 00e1d38..d2da3c0 100644
--- a/src/modules/cgnsGrid.F90
+++ b/src/modules/cgnsGrid.F90
@@ -1,19 +1,12 @@
 module cgnsGrid
-  ! 
+  !
   ! A module to hold the data structures to store information related
   ! to a structured or unstructured CGNS grid
   !
   use constants
 
-#ifdef USECGNSMODULE
        use cgns
        implicit none
-#else
-       implicit none
-       include "cgnslib_f.h"
-       integer(kind=4), private :: dummyInt
-       integer, parameter :: cgsize_t=kind(dummyInt)
-#endif
 
   save