diff -urN WRF-4.z.orig/arch/configure.defaults WRF-4.z/arch/configure.defaults
--- WRF-4.z.orig/arch/configure.defaults	2022-12-19 17:37:16.000000000 +0000
+++ WRF-4.z/arch/configure.defaults	2023-04-24 08:51:45.531492104 +0000
@@ -45,29 +45,29 @@
 NETCDFPAR_BUILD	=      CONFIGURE_NETCDFPAR_BUILD 
 
 ###########################################################
-#ARCH    Linux i486 i586 i686 armv7l aarch64, gfortran compiler with gcc #serial smpar dmpar dm+sm
+#ARCH    Linux i486 i586 i686 armv7l aarch64, armflang compiler with armclang #serial smpar dmpar dm+sm
 #
-DESCRIPTION     =       GNU ($SFC/$SCC)
+DESCRIPTION     =       BSD ($SFC/$SCC)
 DMPARALLEL      =       # 1
 OMPCPP          =       # -D_OPENMP
 OMP             =       # -fopenmp
 OMPCC           =       # -fopenmp
-SFC             =       gfortran
-SCC             =       gcc
-CCOMP           =       gcc
+SFC             =       armflang
+SCC             =       armclang
+CCOMP           =       armclang
 DM_FC           =       mpif90 -f90=$(SFC)
-DM_CC           =       mpicc -cc=$(SCC)
+DM_CC           =       mpicc -DMPI2_SUPPORT
 FC              =       CONFIGURE_FC
 CC              =       CONFIGURE_CC
 LD              =       $(FC)
 RWORDSIZE       =       CONFIGURE_RWORDSIZE
 PROMOTION       =       #-fdefault-real-8
 ARCH_LOCAL      =       -DNONSTANDARD_SYSTEM_SUBR  CONFIGURE_D_CTSM
-CFLAGS_LOCAL    =       -w -O3 -c  # -DRSL0_ONLY
-LDFLAGS_LOCAL   =
+CFLAGS_LOCAL    =       -Ofast -mcpu=native -w -c  # -DRSL0_ONLY
+LDFLAGS_LOCAL   =       -Ofast -mcpu=native -armpl -lamath -lm -lastring
 CPLUSPLUSLIB    =       
 ESMF_LDFLAG     =       $(CPLUSPLUSLIB)
-FCOPTIM         =       -O2 -ftree-vectorize -funroll-loops
+FCOPTIM         =       -Ofast -mcpu=native -funroll-loops
 FCREDUCEDOPT	=       $(FCOPTIM)
 FCNOOPT         =       -O0
 FCDEBUG         =       # -g $(FCNOOPT)  # -fbacktrace -ggdb -fcheck=bounds,do,mem,pointer -ffpe-trap=invalid,zero,overflow
@@ -76,15 +76,15 @@
 FCSUFFIX        =       
 FCCOMPAT        =       
 BYTESWAPIO      =       -fconvert=big-endian -frecord-marker=4
-FCBASEOPTS_NO_G =       -w $(FORMAT_FREE) $(BYTESWAPIO) $(FCCOMPAT)
-FCBASEOPTS      =       $(FCBASEOPTS_NO_G) $(FCDEBUG)
+FCBASEOPTS_NO_G =       -mcpu=native -w $(FORMAT_FREE) $(BYTESWAPIO) $(FCCOMPAT)
+FCBASEOPTS      =       $(OMP) $(FCBASEOPTS_NO_G) $(FCDEBUG)
 MODULE_SRCH_FLAG =
 TRADFLAG        =      CONFIGURE_TRADFLAG
-CPP             =      /lib/cpp CONFIGURE_CPPFLAGS
-AR              =      ar
+CPP             =      cpp CONFIGURE_CPPFLAGS
+AR              =      armllvm-ar
 ARFLAGS         =      ru
 M4              =      m4 -B 14000
-RANLIB          =      ranlib
+RANLIB          =      armllvm-ranlib
 RLFLAGS		=	
 CC_TOOLS        =      $(SCC) 
 NETCDFPAR_BUILD	=      CONFIGURE_NETCDFPAR_BUILD
diff -urN WRF-4.z.orig/configure WRF-4.z/configure
--- WRF-4.z.orig/configure	2021-01-16 01:21:58.000000000 +0800
+++ WRF-4.z/configure	2023-04-12 18:14:27.206708681 +0800
@@ -686,7 +686,7 @@
   foo=foo_$$
 
   grep '^SFC' configure.wrf | grep -i 'gfortran' > /dev/null
-  if [ $? ]
+  if [ $? -eq 0 ]
   then
 
     cat > ${foo}.F << EOF