diff --git a/.gitignore b/.gitignore
index a5a9becfc1b124148d29136883d3ce0c4e942318..cee39574dfb076f119ebed8a6706533e9547feb2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -130,9 +130,13 @@ windows/zip/
 # MacOS stuff
 .DS_Store
 macOS/pkg/
-macOS/deps/sources64/
 macOS/deps/tarballs/
+macOS/deps/sources64/
+macOS/deps/sources64/arm64/
+macOS/deps/sources64/x86_64/
 macOS/deps/lib64/
+macOS/deps/lib64/arm64/
+macOS/deps/lib64/x86_64/
 
 # Emacs stuff
 scripts/dynare.elc
diff --git a/macOS/Makefile b/macOS/Makefile
index 3a51bd58a58776dba4d014ceed328fca1e9e2b54..56d6e2180e9d3133db2837e7818dbd6f7dee0323 100644
--- a/macOS/Makefile
+++ b/macOS/Makefile
@@ -15,22 +15,38 @@
 # You should have received a copy of the GNU General Public License
 # along with Dynare.  If not, see <https://www.gnu.org/licenses/>.
 
-.PHONY: all deps clean-deps clean clean-all build
+.PHONY: all clean-all clean-pkg clean-mex-matlab\
+	deps-arm64 deps-x86_64 \
+	clean-arm64-deps clean-x86_64-deps \
+	build-arm64 build-x86_64
 
-NTHREADS=$(shell sysctl -n hw.ncpu)
+NTHREADS=$(shell sysctl -n hw.physicalcpu)
 
-all: build
+all: build-arm64 build-x86_64
 
-deps:
-	make -C deps -j$(NTHREADS)
+deps-arm64:
+	make -C deps -j$(NTHREADS) build-arm64
 
-clean-deps:
-	make -C deps clean-all
+deps-x86_64:
+	make -C deps -j$(NTHREADS) build-x86_64
 
-clean:
+clean-arm64-deps:
+	make -C deps clean-arm64-all
+
+clean-x86_64-deps:
+	make -C deps clean-x86_64-all
+
+clean-pkg:
 	rm -rf pkg
 
-clean-all: clean-deps clean
+clean-mex-matlab:
+    # make sure there are no symbolic links left to possibly missing mexmaca64 or mexmaci64 files
+	rm -rf ../mex/matlab
+
+clean-all: clean-arm64-deps clean-x86_64-deps clean-pkg clean-mex-matlab
+
+build-arm64: deps-arm64
+	./build.sh arm64
 
-build: deps
-	./build.sh
+build-x86_64: deps-x86_64
+	./build.sh x86_64
diff --git a/macOS/build.sh b/macOS/build.sh
index 76b34808fcbd628186c73c0408e78c6dfb98f89a..a31a1306f10f0fe6d1ff4d769851c5f083ba5af1 100755
--- a/macOS/build.sh
+++ b/macOS/build.sh
@@ -21,6 +21,24 @@ set -ex
 
 ROOTDIR=$(pwd)/..
 
+# Set arch, base dir of homebrew, and versions of MATLAB to be used
+ARCH=$1
+path_remove ()  { export $1="`echo -n ${!1} | awk -v RS=: -v ORS=: '$1 != "'$2'"' | sed 's/:$//'`"; }
+path_prepend () { path_remove $1 $2; export $1="$2:${!1}"; }
+if [ $ARCH == arm64 ]; then
+    BREWDIR=/opt/homebrew
+    # make sure /opt/homebrew/bin is set first in PATH (as it might come last)
+    path_prepend PATH /opt/homebrew/bin
+    MATLAB_VERSION_0=MATLAB_R2022a_Beta
+else
+    BREWDIR=/usr/local
+    # remove /opt/homebrew/bin from PATH, so it does not intervene with the x86_64 compilations below
+    path_remove PATH /opt/homebrew/bin
+    # on x86_64 we need to differentiate between MATLAB < 2018a and MATLAB ≥ 2018a
+    MATLAB_VERSION_0=MATLAB_R2016b
+    MATLAB_VERSION_1=MATLAB_R2019b
+fi
+
 # Set the GCC version
 GCC_VERSION=12
 
@@ -29,10 +47,10 @@ CC=gcc-$GCC_VERSION
 CXX=g++-$GCC_VERSION
 
 # Set the number of threads
-NTHREADS=$(sysctl -n hw.ncpu)
+NTHREADS=$(sysctl -n hw.physicalcpu)
 
 # Set dependency directory
-LIB64="$ROOTDIR"/macOS/deps/lib64
+LIB64="$ROOTDIR"/macOS/deps/lib64/"$ARCH"
 
 
 ##
@@ -64,6 +82,10 @@ else
     LOCATION=$(echo "$VERSION" | cut -f1 -d"-" | cut -c 1-5)-"$DATE"
 fi
 
+# Make sure arch is appended to LOCATION and VERSION
+VERSION="$VERSION"-"$ARCH"
+LOCATION="$LOCATION"-"$ARCH"
+
 ## Hack for statically linking libquadmath, similar to the one used in
 ## deps/Makefile for several libraries (there is no -static-libquadmath flag,
 ## see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=46539).
@@ -73,36 +95,36 @@ fi
 ## - libgfortran.spec does not include --as-needed on macOS, hence it will link the library anyways
 ## Also, it does not seem possible to override libgfortran.spec with the --specs option.
 QUADMATH_DIR=$(mktemp -d)
-ln -s /usr/local/opt/gcc/lib/gcc/$GCC_VERSION/libquadmath.a $QUADMATH_DIR
+ln -s "$BREWDIR"/opt/gcc/lib/gcc/$GCC_VERSION/libquadmath.a $QUADMATH_DIR
 
 ##
-## Compile Dynare doc, preprocessor, mex for MATLAB < 2018a
+## Compile Dynare doc, dynare++, preprocessor, mex using MATLAB_VERSION_0
 ##
 ## NB: In Homebrew, -static-libgfortran is implied by -static-libgcc (see “gfortran -dumpspecs”)
 ## NB2: We use the hack for libquadmath in LDFLAGS
 cd "$ROOTDIR"
-[[ -f configure ]] || autoreconf -si
-./configure \
+arch -$ARCH autoreconf -si
+arch -$ARCH ./configure \
   PACKAGE_VERSION="$VERSION" \
   PACKAGE_STRING="dynare $VERSION" \
   CC=$CC \
   CXX=$CXX \
-  CPPFLAGS=-I/usr/local/include \
+  CPPFLAGS=-I"$BREWDIR"/include \
   LDFLAGS="-static-libgcc -L$QUADMATH_DIR" \
-  LEX=/usr/local/opt/flex/bin/flex \
-  YACC=/usr/local/opt/bison/bin/bison \
+  LEX="$BREWDIR"/opt/flex/bin/flex \
+  YACC="$BREWDIR"/opt/bison/bin/bison \
+  --prefix="$BREWDIR" \
   --with-gsl="$LIB64"/gsl \
   --with-matio="$LIB64"/matio \
   --with-slicot="$LIB64"/Slicot/with-underscore \
   --disable-octave \
-  --with-matlab=/Applications/MATLAB_R2016b.app
+  --with-matlab=/Applications/"$MATLAB_VERSION_0".app
 if [[ -z $CI ]]; then
     # If not in Gitlab CI, clean the source and build the doc
-    make clean
-    make -j"$NTHREADS" pdf html
+    arch -$ARCH make clean
+    arch -$ARCH make pdf html
 fi
-make -j"$NTHREADS"
-
+arch -$ARCH make -j"$NTHREADS"
 
 ##
 ## Create package
@@ -111,11 +133,16 @@ NAME=dynare-"$VERSION"
 PKGFILES="$ROOTDIR"/macOS/pkg/"$NAME"
 mkdir -p \
       "$PKGFILES"/preprocessor \
-      "$PKGFILES"/mex/matlab/maci64-8.3-9.3 \
-      "$PKGFILES"/mex/matlab/maci64-9.4-9.14 \
-      "$PKGFILES"/doc \
+      "$PKGFILES"/doc/dynare++ \
+      "$PKGFILES"/dynare++ \
       "$PKGFILES"/scripts \
       "$PKGFILES"/contrib/ms-sbvar/TZcode
+if [ $ARCH == arm64 ]; then
+    mkdir -p "$PKGFILES"/mex/matlab/maca64-9.12
+else
+    mkdir -p "$PKGFILES"/mex/matlab/maci64-8.3-9.3
+    mkdir -p "$PKGFILES"/mex/matlab/maci64-9.4-9.12
+fi
 
 if [[ $VERSION == *-unstable* ]]; then
     echo "$SHA"                                                    > "$PKGFILES"/sha.txt
@@ -134,7 +161,11 @@ cp -p  "$ROOTDIR"/preprocessor/src/dynare-preprocessor               "$PKGFILES"
 rm -f "$ROOTDIR"/matlab/preprocessor64/dynare_m
 ln -sf ../../preprocessor/dynare-preprocessor                        "$PKGFILES"/matlab/preprocessor64/dynare_m
 
-cp -L  "$ROOTDIR"/mex/matlab/*                                       "$PKGFILES"/mex/matlab/maci64-8.3-9.3
+if [ $ARCH == arm64 ]; then
+    cp -L  "$ROOTDIR"/mex/matlab/*.mexmaca64                         "$PKGFILES"/mex/matlab/maca64-9.12
+else
+    cp -L  "$ROOTDIR"/mex/matlab/**.mexmaci64                        "$PKGFILES"/mex/matlab/maci64-8.3-9.3
+fi
 
 cp -p  "$ROOTDIR"/scripts/dynare.el                                  "$PKGFILES"/scripts
 cp -pr "$ROOTDIR"/contrib/ms-sbvar/TZcode/MatlabFiles                "$PKGFILES"/contrib/ms-sbvar/TZcode
@@ -150,28 +181,29 @@ cp     "$ROOTDIR"/doc/manual/build/latex/dynare-manual.pdf           "$PKGFILES"
 cp -r  "$ROOTDIR"/doc/manual/build/html                              "$PKGFILES"/doc/dynare-manual.html
 
 mkdir -p                                                             "$PKGFILES"/matlab/modules/dseries/externals/x13/macOS/64
-cp -p  "$ROOTDIR"/macOS/deps/lib64/x13as/x13as                       "$PKGFILES"/matlab/modules/dseries/externals/x13/macOS/64
-
-
-##
-## Create mex for MATLAB ≥ 2018a
-##
-cd "$ROOTDIR"/mex/build/matlab
-make clean
-./configure \
-  PACKAGE_VERSION="$VERSION" \
-  PACKAGE_STRING="dynare $VERSION" \
-  CC=$CC \
-  CXX=$CXX \
-  CPPFLAGS=-I/usr/local/include \
-  LDFLAGS="-static-libgcc -L$QUADMATH_DIR" \
-  --with-gsl="$LIB64"/gsl \
-  --with-matio="$LIB64"/matio \
-  --with-slicot="$LIB64"/Slicot/with-underscore \
-  --with-matlab=/Applications/MATLAB_R2022b.app
-make -j"$NTHREADS"
-cp -L  "$ROOTDIR"/mex/matlab/*                                       "$PKGFILES"/mex/matlab/maci64-9.4-9.14
-
+cp -p  "$ROOTDIR"/macOS/deps/lib64/"$ARCH"/x13as/x13as               "$PKGFILES"/matlab/modules/dseries/externals/x13/macOS/64
+
+if [ $ARCH == x86_64 ]; then
+    ##
+    ## Create mex using MATLAB_VERSION_1
+    ##
+    cd "$ROOTDIR"/mex/build/matlab
+    arch -$ARCH make clean
+    arch -$ARCH ./configure \
+        PACKAGE_VERSION="$VERSION" \
+        PACKAGE_STRING="dynare $VERSION" \
+        CC=$CC \
+        CXX=$CXX \
+        CPPFLAGS=-I/usr/local/include \
+        LDFLAGS="-static-libgcc -L$QUADMATH_DIR" \
+        --prefix=/usr/local \
+        --with-gsl="$LIB64"/gsl \
+        --with-matio="$LIB64"/matio \
+        --with-slicot="$LIB64"/Slicot/with-underscore \
+        --with-matlab=/Applications/"$MATLAB_VERSION_1".app
+    arch -$ARCH make -j"$NTHREADS"
+    cp -L  "$ROOTDIR"/mex/matlab/*.mexmaci64                        "$PKGFILES"/mex/matlab/maci64-9.4-9.12
+fi
 
 ##
 ## Make package
@@ -179,12 +211,12 @@ cp -L  "$ROOTDIR"/mex/matlab/*                                       "$PKGFILES"
 cd "$ROOTDIR"/macOS/pkg
 
 # Dynare option
-pkgbuild --root "$PKGFILES" --identifier org.dynare --version "$VERSION" --install-location /Applications/Dynare/"$LOCATION" "$NAME".pkg
+arch -$ARCH pkgbuild --root "$PKGFILES" --identifier org.dynare --version "$VERSION" --install-location /Applications/Dynare/"$LOCATION" "$NAME".pkg
 
 # GCC option
 # Create dummy payload for GCC package; otherwise the size is displayed as 0 bytes in the installer
 dd if=/dev/zero of="$ROOTDIR"/macOS/brewfiles/dummy  bs=1m  count=800
-pkgbuild --root "$ROOTDIR"/macOS/brewfiles --identifier org.dynare.gcc --version "$VERSION" --scripts "$ROOTDIR"/macOS/scripts --install-location /Applications/Dynare/"$LOCATION" "$NAME"-gcc.pkg
+arch -$ARCH pkgbuild --root "$ROOTDIR"/macOS/brewfiles --identifier org.dynare.gcc --version "$VERSION" --scripts "$ROOTDIR"/macOS/scripts/"$ARCH" --install-location /Applications/Dynare/"$LOCATION" "$NAME"-gcc.pkg
 
 # Replace variables in displayed files
 sed "s/VERSION_READ/$VERSION/g" "$ROOTDIR"/macOS/distribution_template.xml > distribution_tmp.xml
@@ -194,7 +226,7 @@ sed "s/VERSION_NO_SPACE/$VERSION/g" "$ROOTDIR"/macOS/welcome.html > "$ROOTDIR"/m
 sed "s/DATE/$DATELONG/g" "$ROOTDIR"/macOS/welcome_tmp.html > "$ROOTDIR"/macOS/welcome.html
 
 # Create installer
-productbuild --distribution distribution.xml --resources "$ROOTDIR"/macOS --package-path ./"$NAME".pkg "$NAME"-new.pkg
+arch -$ARCH productbuild --distribution distribution.xml --resources "$ROOTDIR"/macOS --package-path ./"$NAME".pkg "$NAME"-new.pkg
 
 # cleanup
 rm -f ./*.xml
diff --git a/macOS/deps/Makefile b/macOS/deps/Makefile
index 42f511c93a14aceb493d053dbdd02ec4382f29ca..df15c68a2cfd812457ba43db79c59987bad83b46 100644
--- a/macOS/deps/Makefile
+++ b/macOS/deps/Makefile
@@ -22,66 +22,118 @@ ROOT_PATH = $(realpath .)
 
 WGET_OPTIONS := --no-verbose --no-use-server-timestamps --retry-connrefused --retry-on-host-error
 
-.PHONY: all build build-slicot build-x13as \
-	clean-lib clean-libslicot clean-x13as-bin \
-	clean-src clean-slicot-src clean-x13as-src \
+.PHONY: all clean_all\
+    build-x86_64 build-x86_64-slicot build-x86_64-x13as \
+	build-arm64 build-arm64-slicot build-arm64-x13as \
+	clean-x86_64-lib clean-x86_64-libslicot clean-x86_64-x13as-bin \
+	clean-arm64-lib clean-arm64-libslicot clean-arm64-x13as-bin \
+	clean-x86_64-src clean-x86_64-slicot-src clean-x86_64-x13as-src \
+	clean-arm64-src clean-arm64-slicot-src clean-arm64-x13as-src \
 	clean-tar clean-slicot-tar clean-x13as-tar \
-	clean-all clean-lib clean-src clean-tar
+	clean-x86_64-all clean-x86_64-lib clean-x86_64-src \
+	clean-arm64-all clean-arm64-lib clean-arm64-src \
+	ln-x86_64-matio ln-x86_64-gsl \
+	ln-arm64-matio ln-arm64-gsl
 
-all: build
+all: build-x86_64 build-arm64
 
-build: build-slicot build-x13as ln-matio ln-gsl
+clean_all: clean-x86_64-all clean-arm64-all
 
-clean-lib: clean-libslicot clean-x13as-bin
+build-x86_64: build-x86_64-slicot build-x86_64-x13as ln-x86_64-matio ln-x86_64-gsl
 
-clean-src: clean-slicot-src clean-x13as-src
+build-arm64: build-arm64-slicot build-arm64-x13as ln-arm64-matio ln-arm64-gsl
+
+clean-x86_64-lib: clean-x86_64-libslicot clean-x86_64-x13as-bin
+
+clean-arm64-lib: clean-arm64-libslicot clean-arm64-x13as-bin
+
+clean-x86_64-src: clean-x86_64-slicot-src clean-x86_64-x13as-src
+
+clean-arm64-src: clean-arm64-slicot-src clean-arm64-x13as-src
 
 clean-tar: clean-slicot-tar clean-x13as-tar
 
-clean-all: clean-lib clean-src clean-tar
+clean-x86_64-all: clean-x86_64-lib clean-x86_64-src clean-tar
 
+clean-arm64-all: clean-arm64-lib clean-arm64-src clean-tar
 
 #
 # Matio & GSL
 # (done to link only to static Matio and GSL libraries)
 
 # Matio
-lib64/matio/lib/libmatio.a: /usr/local/lib/libmatio.a
+lib64/x86_64/matio/lib/libmatio.a: /usr/local/lib/libmatio.a
 	mkdir -p $(dir $@) && ln -sf $< $@
 
-lib64/matio/lib/libhdf5.a: /usr/local/lib/libhdf5.a
+lib64/arm64/matio/lib/libmatio.a: /opt/homebrew/lib/libmatio.a
 	mkdir -p $(dir $@) && ln -sf $< $@
 
-lib64/matio/lib/libsz.a: /usr/local/lib/libsz.a
+lib64/x86_64/matio/lib/libhdf5.a: /usr/local/lib/libhdf5.a
 	mkdir -p $(dir $@) && ln -sf $< $@
 
-lib64/matio/include/matio.h: /usr/local/include/matio.h
+lib64/arm64/matio/lib/libhdf5.a: /opt/homebrew/lib/libhdf5.a
+	mkdir -p $(dir $@) && ln -sf $< $@
+
+lib64/x86_64/matio/lib/libsz.a: /usr/local/lib/libsz.a
+	mkdir -p $(dir $@) && ln -sf $< $@
+
+lib64/arm64/matio/lib/libsz.a: /opt/homebrew/lib/libsz.a
+	mkdir -p $(dir $@) && ln -sf $< $@
+
+lib64/x86_64/matio/include/matio.h: /usr/local/include/matio.h
 	mkdir -p $(dir $@) && cd $(dir $@).. && rm -rf include && ln -sf $(dir $<) .
 
-ln-matio: lib64/matio/lib/libmatio.a \
-	lib64/matio/lib/libhdf5.a \
-	lib64/matio/lib/libsz.a \
-	lib64/matio/include/matio.h
+lib64/arm64/matio/include/matio.h: /opt/homebrew/include/matio.h
+	mkdir -p $(dir $@) && cd $(dir $@).. && rm -rf include && ln -sf $(dir $<) .
+
+ln-x86_64-matio: lib64/x86_64/matio/lib/libmatio.a \
+	lib64/x86_64/matio/lib/libhdf5.a \
+	lib64/x86_64/matio/lib/libsz.a \
+	lib64/x86_64/matio/include/matio.h
+
+ln-arm64-matio: lib64/arm64/matio/lib/libmatio.a \
+	lib64/arm64/matio/lib/libhdf5.a \
+	lib64/arm64/matio/lib/libsz.a \
+	lib64/arm64/matio/include/matio.h
 
-clean-matio:
-	rm -rf lib64/matio
+clean-x86_64-matio:
+	rm -rf lib64/x86_64/matio
+
+clean-arm64-matio:
+	rm -rf lib64/arm64/matio
 
 # GSL
-lib64/gsl/lib/libgsl.a: /usr/local/lib/libgsl.a
+lib64/x86_64/gsl/lib/libgsl.a: /usr/local/lib/libgsl.a
+	mkdir -p $(dir $@) && ln -sf $< $@
+
+lib64/arm64/gsl/lib/libgsl.a: /opt/homebrew/lib/libgsl.a
 	mkdir -p $(dir $@) && ln -sf $< $@
 
-lib64/gsl/lib/libgslcblas.a: /usr/local/lib/libgslcblas.a
+lib64/x86_64/gsl/lib/libgslcblas.a: /usr/local/lib/libgslcblas.a
 	mkdir -p $(dir $@) && ln -sf $< $@
 
-lib64/gsl/include/gsl/gsl_blas.h: /usr/local/include/gsl/gsl_blas.h
+lib64/arm64/gsl/lib/libgslcblas.a: /opt/homebrew/lib/libgslcblas.a
+	mkdir -p $(dir $@) && ln -sf $< $@
+
+lib64/x86_64/gsl/include/gsl/gsl_blas.h: /usr/local/include/gsl/gsl_blas.h
+	mkdir -p $(dir $@) && cd $(dir $@).. && rm -rf gsl && ln -sf $(dir $<) .
+
+lib64/arm64/gsl/include/gsl/gsl_blas.h: /opt/homebrew/include/gsl/gsl_blas.h
 	mkdir -p $(dir $@) && cd $(dir $@).. && rm -rf gsl && ln -sf $(dir $<) .
 
-ln-gsl: lib64/gsl/lib/libgsl.a \
-	lib64/gsl/lib/libgslcblas.a \
-	lib64/gsl/include/gsl/gsl_blas.h
+ln-x86_64-gsl: lib64/x86_64/gsl/lib/libgsl.a \
+	lib64/x86_64/gsl/lib/libgslcblas.a \
+	lib64/x86_64/gsl/include/gsl/gsl_blas.h
 
-clean-gsl:
-	rm -rf lib64/gsl
+ln-arm64-gsl: lib64/arm64/gsl/lib/libgsl.a \
+	lib64/arm64/gsl/lib/libgslcblas.a \
+	lib64/arm64/gsl/include/gsl/gsl_blas.h
+
+clean-x86_64-gsl:
+	rm -rf lib64/x86_64/gsl
+
+clean-arm64-gsl:
+	rm -rf lib64/arm64/gsl
 
 #
 # Slicot
@@ -90,43 +142,78 @@ tarballs/slicot-$(SLICOT_VERSION).tar.gz:
 	mkdir -p tarballs
 	wget $(WGET_OPTIONS) -O $@ https://deb.debian.org/debian/pool/main/s/slicot/slicot_$(SLICOT_VERSION).orig.tar.gz
 
-sources64/slicot-$(SLICOT_VERSION)-with-32bit-integer-and-underscore: tarballs/slicot-$(SLICOT_VERSION).tar.gz
-	rm -rf sources64/slicot-*-with-32bit-integer-and-underscore
+sources64/x86_64/slicot-$(SLICOT_VERSION)-with-32bit-integer-and-underscore: tarballs/slicot-$(SLICOT_VERSION).tar.gz
+	rm -rf sources64/x86_64/slicot-*-with-32bit-integer-and-underscore
+	mkdir -p $@
+	tar xf $< --directory $@ --strip-components=1
+	touch $@
+
+sources64/arm64/slicot-$(SLICOT_VERSION)-with-32bit-integer-and-underscore: tarballs/slicot-$(SLICOT_VERSION).tar.gz
+	rm -rf sources64/arm64/slicot-*-with-32bit-integer-and-underscore
 	mkdir -p $@
 	tar xf $< --directory $@ --strip-components=1
 	touch $@
 
-sources64/slicot-$(SLICOT_VERSION)-with-64bit-integer-and-underscore: tarballs/slicot-$(SLICOT_VERSION).tar.gz
-	rm -rf sources64/slicot-*-with-64bit-integer-and-underscore
+sources64/x86_64/slicot-$(SLICOT_VERSION)-with-64bit-integer-and-underscore: tarballs/slicot-$(SLICOT_VERSION).tar.gz
+	rm -rf sources64/x86_64/slicot-*-with-64bit-integer-and-underscore
 	mkdir -p $@
 	tar xf $< --directory $@ --strip-components=1
 	touch $@
 
-lib64/Slicot/with-underscore/lib/libslicot_pic.a: sources64/slicot-$(SLICOT_VERSION)-with-32bit-integer-and-underscore
-	make -C $< FORTRAN=gfortran LOADER=gfortran SLICOTLIB=../libslicot_pic.a OPTS="-O2 -g" lib
+sources64/arm64/slicot-$(SLICOT_VERSION)-with-64bit-integer-and-underscore: tarballs/slicot-$(SLICOT_VERSION).tar.gz
+	rm -rf sources64/arm64/slicot-*-with-64bit-integer-and-underscore
+	mkdir -p $@
+	tar xf $< --directory $@ --strip-components=1
+	touch $@
+
+lib64/x86_64/Slicot/with-underscore/lib/libslicot_pic.a: sources64/x86_64/slicot-$(SLICOT_VERSION)-with-32bit-integer-and-underscore
+	make -C $< FORTRAN=/usr/local/bin/gfortran LOADER=/usr/local/bin/gfortran SLICOTLIB=../libslicot_pic.a OPTS="-O2 -g" lib
 	strip -S $</libslicot_pic.a
 	mkdir -p $(dir $@)
 	cp $</libslicot_pic.a $@
 
-lib64/Slicot/with-underscore/lib/libslicot64_pic.a: sources64/slicot-$(SLICOT_VERSION)-with-64bit-integer-and-underscore
-	make -C $< FORTRAN=gfortran LOADER=gfortran SLICOTLIB=../libslicot64_pic.a OPTS="-O2 -g -fdefault-integer-8" lib
+lib64/arm64/Slicot/with-underscore/lib/libslicot_pic.a: sources64/arm64/slicot-$(SLICOT_VERSION)-with-32bit-integer-and-underscore
+	make -C $< FORTRAN=/opt/homebrew/bin/gfortran LOADER=/opt/homebrew/bin/gfortran SLICOTLIB=../libslicot_pic.a OPTS="-O2 -g" lib
+	strip -S $</libslicot_pic.a
+	mkdir -p $(dir $@)
+	cp $</libslicot_pic.a $@
+
+lib64/x86_64/Slicot/with-underscore/lib/libslicot64_pic.a: sources64/x86_64/slicot-$(SLICOT_VERSION)-with-64bit-integer-and-underscore
+	make -C $< FORTRAN=/usr/local/bin/gfortran LOADER=/usr/local/bin/gfortran SLICOTLIB=../libslicot64_pic.a OPTS="-O2 -g -fdefault-integer-8" lib
+	strip -S $</libslicot64_pic.a
+	mkdir -p $(dir $@)
+	cp $</libslicot64_pic.a $@
+
+lib64/arm64/Slicot/with-underscore/lib/libslicot64_pic.a: sources64/arm64/slicot-$(SLICOT_VERSION)-with-64bit-integer-and-underscore
+	make -C $< FORTRAN=/opt/homebrew/bin/gfortran LOADER=/opt/homebrew/bin/gfortran SLICOTLIB=../libslicot64_pic.a OPTS="-O2 -g -fdefault-integer-8" lib
 	strip -S $</libslicot64_pic.a
 	mkdir -p $(dir $@)
 	cp $</libslicot64_pic.a $@
 
-build-slicot: lib64/Slicot/with-underscore/lib/libslicot_pic.a \
-	lib64/Slicot/with-underscore/lib/libslicot64_pic.a
+build-x86_64-slicot: lib64/x86_64/Slicot/with-underscore/lib/libslicot_pic.a \
+	lib64/x86_64/Slicot/with-underscore/lib/libslicot64_pic.a
+
+build-arm64-slicot: lib64/arm64/Slicot/with-underscore/lib/libslicot_pic.a \
+	lib64/arm64/Slicot/with-underscore/lib/libslicot64_pic.a
 
 clean-slicot-tar:
 	rm -f tarballs/slicot-$(SLICOT_VERSION).tar.gz
 
-clean-slicot-src:
-	rm -rf sources64/slicot-$(SLICOT_VERSION)-with-64bit-integer-and-underscore
+clean-x86_64-slicot-src:
+	rm -rf sources64/x86_64/slicot-$(SLICOT_VERSION)-with-64bit-integer-and-underscore
+	rm -rf sources64/x86_64/slicot-$(SLICOT_VERSION)-with-32bit-integer-and-underscore
 
-clean-libslicot:
-	rm -rf lib64/Slicot
+clean-arm64-slicot-src:
+	rm -rf sources64/arm64/slicot-$(SLICOT_VERSION)-with-64bit-integer-and-underscore
+	rm -rf sources64/arm64/slicot-$(SLICOT_VERSION)-with-32bit-integer-and-underscore
 
-clean-slicot-all: clean-slicot-src clean-slicot-tar clean-libslicot
+clean-x86_64-libslicot:
+	rm -rf lib64/x86_64/Slicot
+
+clean-arm64-libslicot:
+	rm -rf lib64/arm64/Slicot
+
+clean-slicot-all: clean-x86_64-slicot-src clean-arm64-slicot-src clean-slicot-tar clean-x86_64-libslicot clean-arm64-libslicot
 
 
 
@@ -137,36 +224,47 @@ tarballs/x13as_asciisrc-v$(X13AS_VERSION).tar.gz:
 	mkdir -p tarballs
 	wget $(WGET_OPTIONS) -O $@ https://www2.census.gov/software/x-13arima-seats/x13as/unix-linux/program-archives/x13as_asciisrc-v$(X13AS_VERSION).tar.gz
 
-sources64/x13as-$(X13AS_VERSION): tarballs/x13as_asciisrc-v$(X13AS_VERSION).tar.gz
-	rm -rf sources64/x13as-*
+sources64/x86_64/x13as-$(X13AS_VERSION): tarballs/x13as_asciisrc-v$(X13AS_VERSION).tar.gz
+	rm -rf sources64/x86_64/x13as-*
 	mkdir -p $@
 	tar xf $< --directory $@
 
-lib64/x13as/x13as: sources64/x13as-$(X13AS_VERSION)
-	# Statically link x13as (see #1865).
-	# Using -static is not possible, it does not work under Darwin.
-	# Implement an ugly workaround in the absence of -static-libquadmath flag.
-	# In particular, gcc must be used as the linker, because gfortran does not
-	# honour static linking of libquadmath.
-	# Once the -static-libquadmath flag is added (GCC 13? ; see
-	# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=46539), go back to using
-	# gfortran as the linker with -static-libgfortran and
-	# -static-libquadmath flags, and drop the GCC_VERSION variable.
+sources64/arm64/x13as-$(X13AS_VERSION): tarballs/x13as_asciisrc-v$(X13AS_VERSION).tar.gz
+	rm -rf sources64/arm64/x13as-*
+	mkdir -p $@
+	tar xf $< --directory $@
+
+lib64/x86_64/x13as/x13as: sources64/x86_64/x13as-$(X13AS_VERSION)
 	cd $< && sed -i '' 's/-static//g' makefile.gf
-	make -C $< -f makefile.gf FC=gfortran LINKER=gcc-$(GCC_VERSION) FFLAGS="-O2 -std=legacy" LDFLAGS=-static-libgcc LIBS="/usr/local/lib/gcc/current/libgfortran.a /usr/local/lib/gcc/current/libquadmath.a" PROGRAM=x13as
+	arch -x86_64 make -C $< -f makefile.gf FC=/usr/local/bin/gfortran LINKER=/usr/local/bin/gfortran FFLAGS="-O2 -std=legacy" PROGRAM=x13as
 	strip $</x13as
 	mkdir -p $(dir $@)
 	cp $</x13as $@
 
-build-x13as: lib64/x13as/x13as
+lib64/arm64/x13as/x13as: sources64/arm64/x13as-$(X13AS_VERSION)
+	cd $< && sed -i '' 's/-static//g' makefile.gf
+	arch -arm64 make -C $< -f makefile.gf FC=/opt/homebrew/bin/gfortran LINKER=/opt/homebrew/bin/gfortran FFLAGS="-O2 -std=legacy" PROGRAM=x13as
+	strip $</x13as
+	mkdir -p $(dir $@)
+	cp $</x13as $@
+
+build-x86_64-x13as: lib64/x86_64/x13as/x13as
+
+build-arm64-x13as: lib64/arm64/x13as/x13as
 
 clean-x13as-tar:
-	rm -f tarballs/x13assrc_V$(X13AS_VERSION).tar.gz
+	rm -f tarballs/x13as_asciisrc-v$(X13AS_VERSION).tar.gz
+
+clean-x86_64-x13as-src:
+	rm -rf sources64/x86_64/x13as-$(X13AS_VERSION)
+
+clean-arm64-x13as-src:
+	rm -rf sources64/arm64/x13as-$(X13AS_VERSION)
 
-clean-x13as-src:
-	rm -rf sources64/x13as-$(X13AS_VERSION)
+clean-x86_64-x13as-bin:
+	rm -rf lib64/x86_64/x13as
 
-clean-x13as-bin:
-	rm -rf lib64/x13as
+clean-arm64-x13as-bin:
+	rm -rf lib64/arm64/x13as
 
-clean-x13as-all: clean-x13as-tar clean-x13as-src clean-x13as-bin
+clean-x13as-all: clean-x13as-tar clean-x86_64-x13as-src clean-arm64-x13as-src clean-x86_64-x13as-bin clean-arm64-x13as-bin
diff --git a/macOS/scripts/postinstall b/macOS/scripts/arm64/postinstall
similarity index 96%
rename from macOS/scripts/postinstall
rename to macOS/scripts/arm64/postinstall
index 387dd69c8855812613011ec02b6bbe850d536e12..2b0fb4e0bf7ff3847bab6feee5c3fe5a9758c57e 100755
--- a/macOS/scripts/postinstall
+++ b/macOS/scripts/arm64/postinstall
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-# Copyright © 2019-2021 Dynare Team
+# Copyright © 2019-2022 Dynare Team
 #
 # This file is part of Dynare.
 #
@@ -82,7 +82,7 @@ curl -\# -L "$BREW_URL"/tarball/"$BREW_BRANCH" | tar xz -m --strip 1 -C "$BREWDI
 # Change ownership of Dynare directory
 chown -R "$USER":staff "$2"
 
-sudo -u "$USER" "$BREWDIR"/bin/brew tap homebrew/core
+sudo -u "$USER" arch -arm64 "$BREWDIR"/bin/brew tap homebrew/core
 HOMEBREW_CACHE="$HOME"/Library/Caches/Homebrew-Dynare
 HOMEBREW_NO_AUTO_UPDATE=1
 [[ -z "${HOMEBREW_NO_ANALYTICS}" ]] && HOMEBREW_NO_ANALYTICS=1
@@ -91,6 +91,6 @@ HOMEBREW_NO_AUTO_UPDATE=1
 mv "$2"/*.rb "$BREWDIR"/Library/Taps/homebrew/homebrew-core/Formula
 
 # Install GCC & deps
-sudo -u "$USER" "$BREWDIR"/bin/brew install gcc -v --force-bottle
+sudo -u "$USER" arch -arm64 "$BREWDIR"/bin/brew install gcc -v --force-bottle
 
 exit 0
diff --git a/macOS/scripts/x86_64/postinstall b/macOS/scripts/x86_64/postinstall
new file mode 100755
index 0000000000000000000000000000000000000000..25098525af36ea1766aa4dfbfedcca1946f14d38
--- /dev/null
+++ b/macOS/scripts/x86_64/postinstall
@@ -0,0 +1,96 @@
+#!/usr/bin/env bash
+
+# Copyright © 2019-2022 Dynare Team
+#
+# This file is part of Dynare.
+#
+# Dynare is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Dynare is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Dynare.  If not, see <https://www.gnu.org/licenses/>.
+
+set -ex
+
+set -o errexit
+readonly LOG_FILE="$2"/install.log
+sudo touch "$LOG_FILE"
+exec 1>"$LOG_FILE"
+exec 2>&1
+
+# Remove dummy payload
+rm -f "$2"/dummy
+
+# Test for Internet connection
+if ! curl -s -m 4 https://github.com >/dev/null; then
+    osascript -e 'display alert "Dynare Installation Error" message "Not able to connect to github.com. Either you are not connected to the internet or github.com is blocked where you are.\n\nAccess to GitHub is necessary to make Dynare work with the `use_dll` option on macOS.\n\nIf you cannot establish this connection or do not want to use the `use_dll` option of Dynare, please run the installer again and choose \"Customize\" from the \"Installation Type\" screen and uncheck the `GCC` option." as critical'
+    echo "No internet connection to github.com"
+    exit 1
+fi
+
+# Install Command Line Tools
+# Checking that “xcode-select -print-path” returns a valid path is not enough, because
+# the contents of that directory might have been removed (this is the official way of
+# uninstalling CLT, see https://developer.apple.com/library/archive/technotes/tn2339/_index.html#//apple_ref/doc/uid/DTS40014588-CH1-HOW_CAN_I_UNINSTALL_THE_COMMAND_LINE_TOOLS_)
+# Hence we also check that the directory contains the git binary.
+if ! xcpath=$(/usr/bin/xcode-select -print-path) || [[ ! -x "$xcpath"/usr/bin/git ]]; then
+    touch /tmp/.com.apple.dt.CommandLineTools.installondemand.in-progress
+    SUC=$(softwareupdate -l |
+              grep "\*.*Command Line" |
+              grep -m1 "" |
+              awk -F"*" '{print $2}' |
+              sed -e 's/^ *//' |
+              tr -d '\n')
+    # On macOS 10.15 softwareupdate output is preceded by "Label: "
+    [[ $SUC == Label:* ]] && SUC=${SUC#"Label: "}
+    softwareupdate -i "$SUC" --verbose
+    rm -f /tmp/.com.apple.dt.CommandLineTools.installondemand.in-progress
+    softwareupdate -l
+fi
+
+# If CLT installation didn't work, exit
+if ! xcpath=$(/usr/bin/xcode-select -print-path) || [[ ! -x "$xcpath"/usr/bin/git ]]; then
+    osascript -e 'display alert "Dynare Installation Error" message "Not able to find Command Line Tools.\n\nCommand Line Tools is necessary to make Dynare work with the `use_dll` option on macOS.\n\nIf you cannot establish this connection or do not want to use the `use_dll` option of Dynare, please run the installer again and choose \"Customize\" from the \"Installation Type\" screen and uncheck the `GCC` option." as critical'
+    echo "Command Line Tools not installed"
+    exit 1
+fi
+
+# Ensure git is in the path
+if ! which git >/dev/null; then
+    osascript -e 'display alert "Dynare Installation Error" message "Not able to find Git even though the Command Line Tools have already been installed. This is likely a problem with your PATH environment variable.\n\nGit is necessary to make Dynare work with the `use_dll` option on macOS.\n\nIf you cannot establish this connection or do not want to use the `use_dll` option of Dynare, please run the installer again and choose \"Customize\" from the \"Installation Type\" screen and uncheck the `GCC` option." as critical'
+    echo $PATH
+    echo "Git not found in PATH"
+    exit 1
+fi
+
+# Install Homebrew
+BREWDIR="$2"/.brew
+[ -d "$BREWDIR" ] || mkdir -p "$BREWDIR"
+
+BREW_URL="https://github.com/Homebrew/brew"
+BREW_BRANCH="master"
+
+curl -\# -L "$BREW_URL"/tarball/"$BREW_BRANCH" | tar xz -m --strip 1 -C "$BREWDIR"
+
+# Change ownership of Dynare directory
+chown -R "$USER":staff "$2"
+
+sudo -u "$USER" arch -x86_64 "$BREWDIR"/bin/brew tap homebrew/core
+HOMEBREW_CACHE="$HOME"/Library/Caches/Homebrew-Dynare
+HOMEBREW_NO_AUTO_UPDATE=1
+[[ -z "${HOMEBREW_NO_ANALYTICS}" ]] && HOMEBREW_NO_ANALYTICS=1
+
+# Move modified formulas to Homebrew Formula directory
+mv "$2"/*.rb "$BREWDIR"/Library/Taps/homebrew/homebrew-core/Formula
+
+# Install GCC & deps
+sudo -u "$USER" arch -x86_64 "$BREWDIR"/bin/brew install gcc -v --force-bottle
+
+exit 0