diff --git a/Makefile b/Makefile
index d1da4b19f..7ac420ee3 100644
--- a/Makefile
+++ b/Makefile
@@ -65,8 +65,8 @@ MODULES         = $(SWIFTEST_MODULES) $(USER_MODULES)
 .PHONY : all mod fast strict drivers bin clean force 
 
 % : %.f90 force
-	$(FORTRAN) $(FFLAGS) -I$(SWIFTEST_HOME)/include -I$(NETCDF_FORTRAN_HOME)/include $(IMKL) $(IADVIXE) $< -o $@ \
-	  -L$(SWIFTEST_HOME)/lib -lswiftest -L$(NETCDF_FORTRAN_HOME)/lib -lnetcdf -lnetcdff $(LMKL) $(LADVIXE)
+	$(FORTRAN) $(FFLAGS) -I$(SWIFTEST_HOME)/include -I$(NETCDF_FORTRAN_HOME)/include $(IMKL) $< -o $@ \
+	  -L$(SWIFTEST_HOME)/lib -lswiftest -L$(NETCDF_FORTRAN_HOME)/lib -lnetcdf -lnetcdff $(LMKL)
 	$(INSTALL_PROGRAM) $@ $(SWIFTEST_HOME)/bin
 	rm -f $@
 
@@ -79,7 +79,7 @@ all:
 
 mod:
 	cd $(SWIFTEST_HOME)/src/modules/; \
-	  $(FORTRAN) $(FFLAGS) -I$(SWIFTEST_HOME)/include -I$(NETCDF_FORTRAN_HOME)/include $(IMKL) $(IADVIXE) -c $(MODULES); \
+	  $(FORTRAN) $(FFLAGS) -I$(SWIFTEST_HOME)/include -I$(NETCDF_FORTRAN_HOME)/include $(IMKL) -c $(MODULES); \
 	  $(AR) rv $(SWIFTEST_HOME)/lib/libswiftest.a *.o; \
 	  $(INSTALL_DATA) *.mod *.smod $(SWIFTEST_HOME)/include; \
 	  rm -f *.o *.mod  *.smod
@@ -188,34 +188,34 @@ strict:
 	  ln -s $(SWIFTEST_HOME)/Makefile .; \
 	  make strictdir
 	cd $(SWIFTEST_HOME)/src/helio; \
-		$(FORTRAN) $(FSTRICTFLAGS) -I$(SWIFTEST_HOME)/include -I$(NETCDF_FORTRAN_HOME)/include $(IMKL) $(IADVIXE) -c helio_kick.f90; \
+		$(FORTRAN) $(FSTRICTFLAGS) -I$(SWIFTEST_HOME)/include -I$(NETCDF_FORTRAN_HOME)/include $(IMKL) -c helio_kick.f90; \
 		$(AR) rv $(SWIFTEST_HOME)/lib/libswiftest.a *.o *.smod; \
 		$(INSTALL_DATA) *.smod $(SWIFTEST_HOME)/include; \
 		rm -f *.o *.smod	
 	cd $(SWIFTEST_HOME)/src/symba; \
-		$(FORTRAN) $(FSTRICTFLAGS) -I$(SWIFTEST_HOME)/include -I$(NETCDF_FORTRAN_HOME)/include $(IMKL) $(IADVIXE) -c symba_kick.f90; \
+		$(FORTRAN) $(FSTRICTFLAGS) -I$(SWIFTEST_HOME)/include -I$(NETCDF_FORTRAN_HOME)/include $(IMKL) -c symba_kick.f90; \
 		$(AR) rv $(SWIFTEST_HOME)/lib/libswiftest.a *.o *.smod; \
 		$(INSTALL_DATA) *.smod $(SWIFTEST_HOME)/include; \
 		rm -f *.o *.smod
 	cd $(SWIFTEST_HOME)/src/rmvs; \
-		$(FORTRAN) $(FSTRICTFLAGS) -I$(SWIFTEST_HOME)/include -I$(NETCDF_FORTRAN_HOME)/include $(IMKL) $(IADVIXE) -c rmvs_kick.f90; \
+		$(FORTRAN) $(FSTRICTFLAGS) -I$(SWIFTEST_HOME)/include -I$(NETCDF_FORTRAN_HOME)/include $(IMKL) -c rmvs_kick.f90; \
 		$(AR) rv $(SWIFTEST_HOME)/lib/libswiftest.a *.o *.smod; \
 		$(INSTALL_DATA) *.smod $(SWIFTEST_HOME)/include; \
 		rm -f *.o *.smod	
 	cd $(SWIFTEST_HOME)/src/whm; \
-		$(FORTRAN) $(FSTRICTFLAGS) -I$(SWIFTEST_HOME)/include -I$(NETCDF_FORTRAN_HOME)/include $(IMKL) $(IADVIXE) -c whm_kick.f90; \
+		$(FORTRAN) $(FSTRICTFLAGS) -I$(SWIFTEST_HOME)/include -I$(NETCDF_FORTRAN_HOME)/include $(IMKL) -c whm_kick.f90; \
 		$(AR) rv $(SWIFTEST_HOME)/lib/libswiftest.a *.o *.smod; \
 		$(INSTALL_DATA) *.smod $(SWIFTEST_HOME)/include; \
 		rm -f *.o *.smod
 
 fastdir:
-	$(FORTRAN) $(FFLAGS) -I$(SWIFTEST_HOME)/include -I$(NETCDF_FORTRAN_HOME)/include $(IMKL) $(IADVIXE) -c *.f90; \
+	$(FORTRAN) $(FFLAGS) -I$(SWIFTEST_HOME)/include -I$(NETCDF_FORTRAN_HOME)/include $(IMKL) -c *.f90; \
 	$(AR) rv $(SWIFTEST_HOME)/lib/libswiftest.a *.o *.smod; \
 	$(INSTALL_DATA) *.smod $(SWIFTEST_HOME)/include; \
 	rm -f *.o *.smod
 
 strictdir:
-	$(FORTRAN) $(FSTRICTFLAGS) -I$(SWIFTEST_HOME)/include -I$(NETCDF_FORTRAN_HOME)/include $(IMKL) $(IADVIXE) -c *.f90; \
+	$(FORTRAN) $(FSTRICTFLAGS) -I$(SWIFTEST_HOME)/include -I$(NETCDF_FORTRAN_HOME)/include $(IMKL) -c *.f90; \
 	$(AR) rv $(SWIFTEST_HOME)/lib/libswiftest.a *.o *.smod; \
 	$(INSTALL_DATA) *.smod $(SWIFTEST_HOME)/include; \
 	rm -f *.o *.smo	
diff --git a/Makefile.Defines b/Makefile.Defines
index 4bb4e55a8..c943d55d5 100644
--- a/Makefile.Defines
+++ b/Makefile.Defines
@@ -45,12 +45,13 @@ COLLRESOLVE_HOME = $(ROOT_DIR)/collresolve/
 
 # DO NOT include in FFLAGS the "-c" option to compile object only
 # this is done explicitly as needed in the Makefile
-ADVIXE_FLAGS = -g -O2 -qopt-report=5 -vec -shared-intel -ldl -debug inline-debug-info -DTBB_DEBUG -DTBB_USE_THREADING_TOOLS -traceback 
+ADVIXE_FLAGS = -g -O2 -qopt-report=5 -vecabi=cmdtarget -simd -shared-intel -debug inline-debug-info -DTBB_DEBUG -DTBB_USE_THREADING_TOOLS -xhost -traceback 
 #Be sure to set the environment variable KMP_FORKJOIN_FRAMES=1 for OpenMP debuging in vtune
 
+IDEBUG = -O0 -init=snan,arrays  -nogen-interfaces -no-pie -no-ftz -fpe-all=0 -g -traceback -mp1 -fp-model strict -fpe0 -debug all -align all -pad -ip -prec-div -prec-sqrt -assume protect-parens -CB -no-wrap-margin
 STRICTREAL = -fp-model=precise -prec-div -prec-sqrt -assume protect-parens 
 SIMDVEC = -simd -xhost -align all -assume contiguous_assumed_shape -vecabi=cmdtarget -fp-model no-except -fma
-PAR = -qopenmp -parallel
+PAR = -qopenmp -parallel  
 HEAPARR = -heap-arrays 4194304 
 OPTREPORT = -qopt-report=5 
 IPRODUCTION = -no-wrap-margin -O3 -qopt-prefetch=0 -sox $(PAR) $(SIMDVEC) #$(HEAPARR)
@@ -62,17 +63,26 @@ GMEM =  -fsanitize-address-use-after-scope -fstack-check  -fsanitize=bounds-stri
 GWARNINGS = -Wall -Warray-bounds  -Wimplicit-interface -Wextra -Warray-temporaries
 GPRODUCTION = -O3 -ffree-line-length-none $(GPAR)
 
+
 MKL_ROOT = /apps/spack/bell/apps/intel-parallel-studio/cluster.2019.5-intel-19.0.5-4brgqlf/mkl/lib
 IMKL = -I$(MKLROOT)/include
 LMKL = -L$(MKLROOT)/lib/intel64 -qopt-matmul 
 
-FSTRICTFLAGS = $(IPRODUCTION) $(STRICTREAL)
-FFLAGS = $(IPRODUCTION) -fp-model=fast
+FSTRICTFLAGS  = $(IDEBUG) #$(SIMDVEC) $(PAR)
+FFLAGS  = $(IDEBUG) #$(SIMDVEC) $(PAR)
 FORTRAN = ifort
 AR     = xiar
 CC    = icc
 
-CC              = icc
+#FORTRAN = gfortran
+#FFLAGS =  $(GDEBUG)  $(GMEM) #$(GPAR)
+#FSTRICTFLAGS =  $(GDEBUG)  $(GMEM) #$(GPAR)
+#AR     = ar 
+#CC     = cc
+
+# DO NOT include in CFLAGS the "-c" option to compile object only
+# this is done explicitly as needed in the Makefile
+
 CFLAGS          = -O3 -w -m64 -std=c99
 
 64_BIT_REALS    = -r8