diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 7e8de3ee4..d610f51f0 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -275,6 +275,13 @@ Spectral_ipNeighborhood:
     - master
     - release
 
+RGC_DetectChanges:
+  stage: spectral
+  script: RGC_DetectChanges/test.py
+  except:
+    - master
+    - release
+
 Nonlocal_Damage_DetectChanges:
   stage: spectral
   script: Nonlocal_Damage_DetectChanges/test.py
diff --git a/Makefile b/Makefile
index 4149078d1..a8a7a6e0f 100644
--- a/Makefile
+++ b/Makefile
@@ -3,7 +3,7 @@ SHELL = /bin/sh
 # Makefile for the installation of DAMASK
 ########################################################################################
 .PHONY: all
-all: spectral FEM marc processing
+all: spectral FEM processing
 
 .PHONY: spectral
 spectral: build/spectral
@@ -23,10 +23,6 @@ build/FEM:
 	@mkdir -p build/FEM
 	@(cd build/FEM; cmake -Wno-dev -DDAMASK_SOLVER=FEM -DCMAKE_BUILD_TYPE=${BUILD_TYPE} -DBUILDCMD_POST=${BUILDCMD_POST} -DBUILDCMD_PRE=${BUILDCMD_PRE} -DOPTIMIZATION=${OPTIMIZATION} -DOPENMP=${OPENMP} ../../;)
 
-.PHONY: marc
-marc:
-	@./installation/mods_MarcMentat/apply_DAMASK_modifications.sh ${MAKEFLAGS}
-
 .PHONY: clean
 clean:
 	@rm -rf build
diff --git a/PRIVATE b/PRIVATE
index 70f135395..3d4211812 160000
--- a/PRIVATE
+++ b/PRIVATE
@@ -1 +1 @@
-Subproject commit 70f135395370b06c424e0dcf163afbd9d8ad24a1
+Subproject commit 3d42118124eb1b4bccb6164d714af25650ba5a93
diff --git a/VERSION b/VERSION
index e4ebd3adb..098ab4a69 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-v2.0.2-756-g7217cdac
+v2.0.2-830-g0cbcb028
diff --git a/processing/post/filterTable.py b/processing/post/filterTable.py
index aca94371c..ce09fc7b3 100755
--- a/processing/post/filterTable.py
+++ b/processing/post/filterTable.py
@@ -139,6 +139,7 @@ for name in filenames:
       table.data_readArray(positions+1)                                                               # read desired columns (indexed 1,...)
       table.data_writeArray()                                                                         # directly write out
     except:
+      table.data_rewind()
       atOnce = False                                                                                  # data contains items that prevent array chunking
 
   if not atOnce:                                                                                      # read data line by line
diff --git a/processing/post/postResults.py b/processing/post/postResults.py
index 8b7e610e3..2343ca3de 100755
--- a/processing/post/postResults.py
+++ b/processing/post/postResults.py
@@ -79,7 +79,7 @@ class MPIEspectral_result:    # mimic py_post result object
     self.dataOffset = 0
     while self.dataOffset < self.filesize:
       self.file.seek(self.dataOffset)
-      if self.file.read(3) == 'eoh': break
+      if self.file.read(3) == b'eoh': break
       self.dataOffset += 1
     self.dataOffset   += 7
 #search first for the new keywords with ':', if not found try to find the old ones
@@ -179,7 +179,7 @@ class MPIEspectral_result:    # mimic py_post result object
       self.file.seek(filepos)
 # read the starting tag in front of the keyword (Fortran indicates start and end of writing by a 4 byte tag indicating the length of the following data)
       dataLen=struct.unpack('i',self.file.read(4))[0]
-      name = self.file.read(len(identifier))                                                        # anticipate identifier
+      name = self.file.read(len(identifier)).decode(errors="ignore")                                # anticipate identifier
       start=filepos+(4+len(identifier))                                                             # position of the values for the found key
       filepos=filepos+(4+dataLen+4)                                                                 # forward to next keyword
 
@@ -202,7 +202,7 @@ class MPIEspectral_result:    # mimic py_post result object
   def _keyedString(self,identifier,default=None):
     value = default
     self.file.seek(0)
-    m = re.search(r'(.{4})%s(.*?)\1'%identifier,self.file.read(self.dataOffset),re.DOTALL)
+    m = re.search(r'(.{4})%s(.*?)\1'%identifier,self.file.read(self.dataOffset).decode(errors="ignore"),re.DOTALL)
     if m:
       value = m.group(2)
     return value
@@ -466,7 +466,7 @@ def ParseOutputFormat(filename,what,me):
   """Parse .output* files in order to get a list of outputs"""
   content = []
   format = {'outputs':{},'specials':{'brothers':[]}}
-  for prefix in ['']+map(str,range(1,17)):
+  for prefix in ['']+list(map(str,range(1,17))):
     if os.path.exists(prefix+filename+'.output'+what):
       try:
         file = open(prefix+filename+'.output'+what)
@@ -850,7 +850,7 @@ for opt in ['nodalScalar','elemScalar','elemTensor','homogenizationResult','crys
       if (opt in ['nodalScalar','elemScalar','elemTensor'] and label not in stat['IndexOfLabel'] and label not in ['elements',]) \
            or (opt in ['homogenizationResult','crystalliteResult','constitutiveResult'] \
                and (not outputFormat[opt[:-6].capitalize()]['outputs'] \
-                  or label not in zip(*outputFormat[opt[:-6].capitalize()]['outputs'])[0])):
+                  or label not in list(zip(*outputFormat[opt[:-6].capitalize()]['outputs']))[0])):
         parser.error('%s "%s" unknown...'%(opt,label))
 
 
@@ -935,8 +935,8 @@ else:
   for e in range(stat['NumberOfElements']):
     if options.verbose and e%1000 == 0: bg.set_message('scan elem %i...'%e)
     myElemID = p.element_id(e)
-    myIpCoordinates = ipCoords(p.element(e).type, map(lambda node: [node.x, node.y, node.z],
-                                                         map(p.node, map(p.node_sequence, p.element(e).items))))
+    myIpCoordinates = ipCoords(p.element(e).type, list(map(lambda node: [node.x, node.y, node.z],
+                                                         list(map(p.node, map(p.node_sequence, p.element(e).items))))))
     myIpIDs = ipIDs(p.element(e).type)
     Nips = len(myIpIDs)
     myNodeIDs = p.element(e).items[:Nips]
@@ -1023,7 +1023,7 @@ if options.verbose: bg.set_message('getting map between positions and increments
 incAtPosition = {}
 positionOfInc = {}
 
-for position in range(stat['NumberOfIncrements']):
+for position in range(int(stat['NumberOfIncrements'])):
   p.moveto(position+offset_pos)
   incAtPosition[position] = p.increment            # remember "real" increment at this position
   positionOfInc[p.increment] = position            # remember position of "real" increment
@@ -1130,7 +1130,7 @@ for incCount,position in enumerate(locations):     # walk through locations
                                       ['Crystallite']*len(options.crystalliteResult) +
                                       ['Constitutive']*len(options.constitutiveResult)
                                       ):
-          outputIndex = list(zip(*outputFormat[resultType]['outputs'])[0]).index(label)             # find the position of this output in the outputFormat
+          outputIndex = (list(zip(*outputFormat[resultType]['outputs']))[0]).index(label)             # find the position of this output in the outputFormat
           length = int(outputFormat[resultType]['outputs'][outputIndex][1])
           thisHead = heading('_',[[component,''.join( label.split() )] for component in range(int(length>1),length+int(length>1))])
           if assembleHeader: header += thisHead
diff --git a/src/DAMASK_interface.f90 b/src/DAMASK_interface.f90
index 3bd4df68f..a2b4f53f2 100644
--- a/src/DAMASK_interface.f90
+++ b/src/DAMASK_interface.f90
@@ -43,25 +43,42 @@ subroutine DAMASK_interface_init()
  use, intrinsic :: &
    iso_fortran_env
 #include <petsc/finclude/petscsys.h>
+#if defined(__GFORTRAN__) &&  __GNUC__ < 5
+===================================================================================================
+  5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0
+===================================================================================================
+==================   THIS VERSION OF DAMASK REQUIRES gfortran > 5.0  ==============================
+======================   THIS VERSION OF DAMASK REQUIRES gfortran > 5.0  ==========================
+=========================   THIS VERSION OF DAMASK REQUIRES gfortran > 5.0  =======================
+===================================================================================================
+  5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0
+===================================================================================================
+#endif
+
+#if defined(__INTEL_COMPILER) && __INTEL_COMPILER < 1600
+===================================================================================================
+  16.0 16.0 16.0 16.0 16.0 16.0 16.0 16.0 16.0 16.0 16.0 16.0 16.0 16.0 16.0 16.0 16.0 16.0 16.0 
+===================================================================================================
+==================   THIS VERSION OF DAMASK REQUIRES ifort > 16.0  ================================
+======================   THIS VERSION OF DAMASK REQUIRES ifort > 16.0   ===========================
+=========================   THIS VERSION OF DAMASK REQUIRES ifort > 16.0   ========================
+===================================================================================================
+  16.0 16.0 16.0 16.0 16.0 16.0 16.0 16.0 16.0 16.0 16.0 16.0 16.0 16.0 16.0 16.0 16.0 16.0 16.0 
+===================================================================================================
+#endif
+
 #if PETSC_VERSION_MAJOR!=3 || PETSC_VERSION_MINOR!=10
 ===================================================================================================
  3.10.x 3.10.x 3.10.x 3.10.x 3.10.x 3.10.x 3.10.x 3.10.x 3.10.x 3.10.x 3.10.x 3.10.x 3.10.x 3.10.x
 ===================================================================================================
-=======   THIS VERSION OF DAMASK REQUIRES PETSc 3.10.x   ==========================================
-==========   THIS VERSION OF DAMASK REQUIRES PETSc 3.10.x   =======================================
-=============   THIS VERSION OF DAMASK REQUIRES PETSc 3.10.x   ====================================
-================   THIS VERSION OF DAMASK REQUIRES PETSc 3.10.x   =================================
 ===================   THIS VERSION OF DAMASK REQUIRES PETSc 3.10.x   ==============================
 ======================   THIS VERSION OF DAMASK REQUIRES PETSc 3.10.x   ===========================
 =========================   THIS VERSION OF DAMASK REQUIRES PETSc 3.10.x   ========================
-============================   THIS VERSION OF DAMASK REQUIRES PETSc 3.10.x   =====================
-===============================   THIS VERSION OF DAMASK REQUIRES PETSc 3.10.x   ==================
-==================================   THIS VERSION OF DAMASK REQUIRES PETSc 3.10.x   ===============
-=====================================   THIS VERSION OF DAMASK REQUIRES PETSc 3.10.x   ============
 ===================================================================================================
  3.10.x 3.10.x 3.10.x 3.10.x 3.10.x 3.10.x 3.10.x 3.10.x 3.10.x 3.10.x 3.10.x 3.10.x 3.10.x 3.10.x
 ===================================================================================================
 #endif
+
  use PETScSys
  use system_routines, only: &
    getHostName, &
diff --git a/src/DAMASK_marc2018.f90 b/src/DAMASK_marc2018.f90
new file mode 120000
index 000000000..2c5bec706
--- /dev/null
+++ b/src/DAMASK_marc2018.f90
@@ -0,0 +1 @@
+DAMASK_marc.f90
\ No newline at end of file