diff --git a/.github/workflows/build-macos.yml b/.github/workflows/build-macos.yml
new file mode 100644
index 0000000..0a88aaa
--- /dev/null
+++ b/.github/workflows/build-macos.yml
@@ -0,0 +1,45 @@
+name: Compile GCC (macOS)
+on:
+  push:
+    tags: '*'
+    branches: [master]
+    paths-ignore:
+      - README.md
+  pull_request:
+    branches: [master]
+jobs:
+  build:
+    runs-on: macos-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        version:
+          - 2.7.2-psx
+          - 2.7.2-cdk
+          - 2.8.1-psx
+    name: Build GCC ${{ matrix.version }} (macOS)
+    steps:
+      - name: Clone repository
+        uses: actions/checkout@v4
+      - name: Install dependencies
+        run: |
+          # byacc is required for gcc-2.7.2-cdk
+          brew install byacc
+      - name: Build GCC
+        run: VERSION=${{ matrix.version }} PLATFORM=macos make
+      - name: Create release archive
+        shell: bash
+        run: |
+          cd build-gcc-${{ matrix.version }}
+          tar -czvf ../gcc-${{ matrix.version }}-macos.tar.gz *
+      - name: Create artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: gcc-${{ matrix.version }}-macos
+          path: gcc-${{ matrix.version }}-macos.tar.gz
+      - name: Publish release
+        uses: softprops/action-gh-release@v2
+        if: startsWith(github.ref, 'refs/tags/')
+        with:
+          files: |
+            gcc-${{ matrix.version }}-macos.tar.gz
diff --git a/Makefile b/Makefile
index 10936df..b45b67e 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,11 @@
+PLATFORM ?= linux
+
 all: check-version
+ifeq ($(PLATFORM),macos)
+	bash gcc-$(VERSION)-macos.sh
+else
 	docker build -f gcc-$(VERSION).Dockerfile --target export --output build-gcc-$(VERSION) .
+endif
 
 clean:
 	rm -rf build-gcc-*/
@@ -8,8 +14,14 @@ check-version:
 ifndef VERSION
 	$(error You must specify a VERSION e.g. `make VERSION=2.8.1`)
 endif
+ifeq ($(PLATFORM),macos)
+ifeq ($(wildcard gcc-$(VERSION)-macos.sh),)
+	$(error Building GCC $(VERSION) for macOS is not currently supported)
+endif
+else
 ifeq ($(wildcard gcc-$(VERSION).Dockerfile),)
 	$(error Building GCC $(VERSION) is not currently supported)
 endif
+endif
 
 .PHONY: all check-version
diff --git a/gcc-2.7.2-cdk-macos.sh b/gcc-2.7.2-cdk-macos.sh
new file mode 100755
index 0000000..0709a80
--- /dev/null
+++ b/gcc-2.7.2-cdk-macos.sh
@@ -0,0 +1,89 @@
+#!/bin/bash
+# Build gcc-2.7.2-cdk natively on macOS (x86_64 and aarch64).
+# Produces Mach-O cc1 and companion binaries targeting mips-sony-psx.
+#
+# Requires: byacc  (install via Homebrew: brew install byacc)
+set -e
+
+if ! command -v byacc >/dev/null 2>&1; then
+    echo "Error: byacc is required. Install it with: brew install byacc" >&2
+    exit 1
+fi
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+PATCHES="$SCRIPT_DIR/patches"
+OUTDIR="$SCRIPT_DIR/build-gcc-2.7.2-cdk"
+WORKDIR="$(mktemp -d)"
+trap 'rm -rf "$WORKDIR"' EXIT
+
+echo "Building gcc-2.7.2-cdk for macOS in $WORKDIR"
+
+# Ensure we use the system compiler and tools, not any cross-compiler wrappers
+# that may be in PATH (e.g. from a nix shell).
+export PATH="/usr/bin:/bin:/usr/sbin:/sbin:$PATH"
+unset CC CXX
+
+cd "$WORKDIR"
+curl -fL "https://github.com/decompals/old-gcc/releases/download/0.14/b18.tar.gz" | tar xz
+cd cdk-gcc-b18
+
+# Apply the same patches as the Linux Dockerfile
+# macOS SDKs declare sys_nerr as 'const int'; fix the conflicting declarations.
+for f in gcc.c cp/g++.c; do
+    [ -f "$f" ] && sed -i '' 's/^extern int sys_nerr;/extern const int sys_nerr;/' "$f"
+done
+patch -u -p1 Makefile.in        -i "$PATCHES/Makefile-2.7.2-cdk.in.patch"
+patch -u -p1 obstack.h          -i "$PATCHES/obstack-2.7.2-cdk.h.patch"
+patch -u -p1 config/mips/mips.h -i "$PATCHES/mipsel-2.7-cdk.patch"
+patch -su -p1                   <  "$PATCHES/psx-2.7.2-cdk.patch"
+
+# macOS: replace config.guess/config.sub with modern versions that know
+# about aarch64-apple-darwin, then add psx* to the OS list.
+# Pinned to specific commits for reproducibility.
+chmod +w config.guess config.sub
+curl -fsL "https://raw.githubusercontent.com/gcc-mirror/gcc/74af13c174714dd3b9f1ded4b39955f003c16361/config.guess" -o config.guess
+curl -fsL "https://raw.githubusercontent.com/gcc-mirror/gcc/6fad101f3063d722e3348d07dc93cf737f8709e4/config.sub"   -o config.sub
+chmod +x config.guess config.sub
+sed -i '' 's/| hiux\* | abug | nacl\*/| psx* \\\
+'"$(printf '\t')"'     | hiux* | abug | nacl*/' config.sub
+
+# Add xm-darwin.h and teach configure about *-apple-darwin* hosts.
+cp "$PATCHES/xm-darwin.h" config/
+chmod +w configure
+awk '/^\t\*\)$/ { buf=$0; next }
+     buf != "" { if (!done && /echo.*Configuration.*not supported/) {
+       print "\t*-apple-darwin*)"; print "\t\txm_file=xm-darwin.h"
+       print "\t\tfixincludes=Makefile.in"; print "\t\t;;"; done=1 }
+       print buf; buf="" } { print }' configure > configure.tmp
+mv configure.tmp configure
+chmod +x configure
+
+./configure \
+    --target=mips-sony-psx \
+    --prefix=/opt/cross \
+    --with-endian-little \
+    --with-gnu-as \
+    --disable-gprof \
+    --disable-gdb \
+    --disable-werror
+
+# Compile the __eprintf stub — this symbol was removed from macOS SDKs
+# after 10.14 but is referenced by the exception-handling code.
+EPRINTF_OBJ="$PWD/eprintf-darwin.o"
+cc -std=gnu89 -c "$PATCHES/eprintf-darwin.c" -o "$EPRINTF_OBJ"
+
+# Build single-threaded: parallel yacc invocations race on y.tab.h,
+# causing bi-parser.h to be generated with the wrong grammar.
+make cpp cc1 xgcc cc1plus g++ \
+    CFLAGS="-std=gnu89 -w -Wno-int-conversion -Wno-implicit-function-declaration -Wno-return-mismatch" \
+    LDFLAGS="$EPRINTF_OBJ"
+
+# Run the same tests as the Dockerfile
+./cc1 -quiet -O2 "$SCRIPT_DIR/tests/little_endian.c" -o little_endian.s
+grep -E 'lbu\s\$2,0\(\$4\)' little_endian.s
+./cc1 -quiet -O2 "$SCRIPT_DIR/tests/section_attribute.c" -o /dev/null
+
+mkdir -p "$OUTDIR"
+cp cpp cc1 xgcc cc1plus g++ "$OUTDIR/"
+mv "$OUTDIR/xgcc" "$OUTDIR/gcc"
+echo "Done — $OUTDIR/ ($(file "$OUTDIR/cc1" | cut -d: -f2 | xargs))"
diff --git a/gcc-2.7.2-psx-macos.sh b/gcc-2.7.2-psx-macos.sh
new file mode 100755
index 0000000..31d20be
--- /dev/null
+++ b/gcc-2.7.2-psx-macos.sh
@@ -0,0 +1,79 @@
+#!/bin/bash
+# Build gcc-2.7.2-psx natively on macOS (x86_64 and aarch64).
+# Produces Mach-O cc1 and companion binaries targeting mips-sony-psx.
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+PATCHES="$SCRIPT_DIR/patches"
+OUTDIR="$SCRIPT_DIR/build-gcc-2.7.2-psx"
+WORKDIR="$(mktemp -d)"
+trap 'rm -rf "$WORKDIR"' EXIT
+
+echo "Building gcc-2.7.2-psx for macOS in $WORKDIR"
+
+# Ensure we use the system compiler and tools, not any cross-compiler wrappers
+# that may be in PATH (e.g. from a nix shell).
+export PATH="/usr/bin:/bin:/usr/sbin:/sbin:$PATH"
+unset CC CXX
+
+cd "$WORKDIR"
+curl -fL "https://ftp.gnu.org/old-gnu/gcc/gcc-2.7.2.tar.gz" | tar xz
+cd gcc-2.7.2
+
+# Apply the same patches as the Linux Dockerfile
+# Replace varargs.h with stdarg.h; some files are read-only from the tarball.
+grep -rl 'include <varargs\.h>' *.c | xargs chmod u+w
+sed -i '' 's/include <varargs\.h>/include <stdarg\.h>/g' *.c
+# macOS SDKs declare sys_nerr as 'const int'; fix the conflicting declarations.
+for f in gcc.c cp/g++.c; do
+    [ -f "$f" ] && sed -i '' 's/^extern int sys_nerr;/extern const int sys_nerr;/' "$f"
+done
+
+patch -u -p1 obstack.h      -i "$PATCHES/obstack-2.7.2.h.patch"
+patch -u -p1 configure      -i "$PATCHES/configure.patch"
+patch -u -p1 config/mips/mips.h -i "$PATCHES/mipsel-2.7.patch"
+patch -su -p1               <  "$PATCHES/psx-2.5.7.patch"
+
+# macOS: replace config.guess/config.sub with modern versions that know
+# about aarch64-apple-darwin, then add psx* to the OS list.
+# Pinned to specific commits for reproducibility.
+chmod +w config.guess config.sub
+curl -fsL "https://raw.githubusercontent.com/gcc-mirror/gcc/74af13c174714dd3b9f1ded4b39955f003c16361/config.guess" -o config.guess
+curl -fsL "https://raw.githubusercontent.com/gcc-mirror/gcc/6fad101f3063d722e3348d07dc93cf737f8709e4/config.sub"   -o config.sub
+chmod +x config.guess config.sub
+sed -i '' 's/| hiux\* | abug | nacl\*/| psx* \\\
+'"$(printf '\t')"'     | hiux* | abug | nacl*/' config.sub
+
+# Add xm-darwin.h and teach configure about *-apple-darwin* hosts.
+cp "$PATCHES/xm-darwin.h" config/
+chmod +w configure
+awk '/^\t\*\)$/ { buf=$0; next }
+     buf != "" { if (!done && /echo.*Configuration.*not supported/) {
+       print "\t*-apple-darwin*)"; print "\t\txm_file=xm-darwin.h"
+       print "\t\tfixincludes=Makefile.in"; print "\t\t;;"; done=1 }
+       print buf; buf="" } { print }' configure > configure.tmp
+mv configure.tmp configure
+chmod +x configure
+
+./configure \
+    --target=mips-sony-psx \
+    --prefix=/opt/cross \
+    --with-endian-little \
+    --with-gnu-as \
+    --disable-gprof \
+    --disable-gdb \
+    --disable-werror
+
+make --jobs "$(sysctl -n hw.ncpu)" cpp cc1 xgcc cc1plus g++ \
+    CFLAGS="-std=gnu89 -w -Wno-int-conversion -Wno-implicit-function-declaration -Wno-return-mismatch"
+
+# Run the same tests as the Dockerfile
+./cc1 -quiet -O2 "$SCRIPT_DIR/tests/little_endian.c" -o little_endian.s
+grep -E 'lbu\s\$2,0\(\$4\)' little_endian.s
+./cc1 -quiet -O2 "$SCRIPT_DIR/tests/section_attribute.c" -o /dev/null
+./cc1 -quiet -help </dev/null 2>&1 | grep -- -msoft-float
+
+mkdir -p "$OUTDIR"
+cp cpp cc1 xgcc cc1plus g++ "$OUTDIR/"
+mv "$OUTDIR/xgcc" "$OUTDIR/gcc"
+echo "Done — $OUTDIR/ ($(file "$OUTDIR/cc1" | cut -d: -f2 | xargs))"
diff --git a/gcc-2.8.1-psx-macos.sh b/gcc-2.8.1-psx-macos.sh
new file mode 100755
index 0000000..961eca5
--- /dev/null
+++ b/gcc-2.8.1-psx-macos.sh
@@ -0,0 +1,92 @@
+#!/bin/bash
+# Build gcc-2.8.1-psx natively on macOS (x86_64 and aarch64).
+# Produces Mach-O cc1 and companion binaries targeting mips-sony-psx.
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+PATCHES="$SCRIPT_DIR/patches"
+OUTDIR="$SCRIPT_DIR/build-gcc-2.8.1-psx"
+WORKDIR="$(mktemp -d)"
+trap 'rm -rf "$WORKDIR"' EXIT
+
+echo "Building gcc-2.8.1-psx for macOS in $WORKDIR"
+
+# Ensure we use the system compiler, not any cross-compiler wrappers that
+# may be in PATH (e.g. from a nix shell).
+export PATH="/usr/bin:/bin:/usr/sbin:/sbin:$PATH"
+unset CC CXX
+
+cd "$WORKDIR"
+curl -fL "https://mirrors.kernel.org/gnu/gcc/gcc-2.8.1.tar.gz" | tar xz
+cd gcc-2.8.1
+
+# Apply the same patches as the Linux Dockerfile
+# Replace varargs.h with stdarg.h; some files are read-only from the tarball.
+grep -rl 'include <varargs\.h>' *.c | xargs chmod u+w
+sed -i '' 's/include <varargs\.h>/include <stdarg\.h>/g' *.c
+# macOS SDKs declare sys_nerr as 'const int'; fix the conflicting declarations.
+for f in gcc.c cp/g++.c; do
+    [ -f "$f" ] && sed -i '' 's/^extern int sys_nerr;/extern const int sys_nerr;/' "$f"
+done
+
+patch -u -p1 obstack.h          -i "$PATCHES/obstack-2.8.1.h.patch"
+patch -u -p1 config/mips/mips.h -i "$PATCHES/mips.patch"
+patch -su -p1                   <  "$PATCHES/psx.patch"
+
+# macOS: replace config.guess/config.sub with modern versions that know
+# about aarch64-apple-darwin, then add psx* to the OS list.
+# Pinned to specific commits for reproducibility.
+chmod +w config.guess config.sub
+curl -fsL "https://raw.githubusercontent.com/gcc-mirror/gcc/74af13c174714dd3b9f1ded4b39955f003c16361/config.guess" -o config.guess
+curl -fsL "https://raw.githubusercontent.com/gcc-mirror/gcc/6fad101f3063d722e3348d07dc93cf737f8709e4/config.sub"   -o config.sub
+chmod +x config.guess config.sub
+sed -i '' 's/| hiux\* | abug | nacl\*/| psx* \\\
+'"$(printf '\t')"'     | hiux* | abug | nacl*/' config.sub
+
+# Add xm-darwin.h and teach configure about *-apple-darwin* hosts.
+cp "$PATCHES/xm-darwin.h" config/
+chmod +w configure
+awk '/^\t\*\)$/ { buf=$0; next }
+     buf != "" { if (!done && /echo.*Configuration.*not supported/) {
+       print "\t*-apple-darwin*)"; print "\t\txm_file=xm-darwin.h"
+       print "\t\tfixincludes=Makefile.in"; print "\t\t;;"; done=1 }
+       print buf; buf="" } { print }' configure > configure.tmp
+mv configure.tmp configure
+chmod +x configure
+
+# Explicitly pass --host/--build so configure uses a single-arg config.sub
+# call (which modern config.sub accepts), rather than its multi-arg form.
+# Export CFLAGS so configure's compiler test (main(){return(0);}) passes under
+# modern clang, which rejects implicit int without -std=gnu89.
+DARWIN_HOST="$(uname -m)-apple-darwin"
+export CFLAGS="-std=gnu89 -w -Wno-int-conversion -Wno-implicit-function-declaration -Wno-return-mismatch"
+./configure \
+    --target=mips-sony-psx \
+    --host="$DARWIN_HOST" \
+    --build="$DARWIN_HOST" \
+    --prefix=/opt/cross \
+    --with-endian-little \
+    --with-gnu-as \
+    --disable-gprof \
+    --disable-gdb \
+    --disable-werror
+
+# insn-config.h is generated during the build but referenced early; touch
+# it to prevent spurious missing-file errors on some make versions.
+touch insn-config.h
+
+make --jobs "$(sysctl -n hw.ncpu)" cpp cc1 xgcc cc1plus g++ \
+    CFLAGS="-std=gnu89 -w -Wno-int-conversion -Wno-implicit-function-declaration -Wno-return-mismatch"
+
+# Run the same tests as the Dockerfile
+./cc1 -quiet -O2 "$SCRIPT_DIR/tests/little_endian.c" -o little_endian.s
+grep -E 'lbu\s\$2,0\(\$4\)' little_endian.s
+./cc1 -quiet -O2 "$SCRIPT_DIR/tests/section_attribute.c" -o /dev/null
+./cc1 -version </dev/null 2>&1 | grep -- -msoft-float
+./cc1 -version </dev/null 2>&1 | grep -- -msplit-addresses
+./cc1 -version </dev/null 2>&1 | grep -- -mgpopt
+
+mkdir -p "$OUTDIR"
+cp cpp cc1 xgcc cc1plus g++ "$OUTDIR/"
+mv "$OUTDIR/xgcc" "$OUTDIR/gcc"
+echo "Done — $OUTDIR/ ($(file "$OUTDIR/cc1" | cut -d: -f2 | xargs))"
diff --git a/patches/eprintf-darwin.c b/patches/eprintf-darwin.c
new file mode 100644
index 0000000..35dd16c
--- /dev/null
+++ b/patches/eprintf-darwin.c
@@ -0,0 +1,13 @@
+/* Stub for __eprintf, removed from macOS SDKs after 10.14.
+   Required by gcc-2.7.2-cdk's exception-handling code.  */
+#include <stdio.h>
+#include <stdlib.h>
+
+/* weak: if another object (e.g. tree.o in cdk) also defines __eprintf,
+   that strong definition takes precedence and no duplicate-symbol error occurs. */
+__attribute__((weak)) void
+__eprintf (const char *fmt, const char *file, unsigned line, const char *expr)
+{
+  fprintf (stderr, fmt, file, line, expr);
+  abort ();
+}
diff --git a/patches/xm-darwin.h b/patches/xm-darwin.h
new file mode 100644
index 0000000..8197624
--- /dev/null
+++ b/patches/xm-darwin.h
@@ -0,0 +1,25 @@
+/* Host machine description for GCC running on macOS (Darwin).
+   Works for both x86_64 and aarch64 (Apple Silicon).
+
+   macOS uses the LP64 model: int is 32-bit, long and pointers are 64-bit.  */
+
+#define HOST_BITS_PER_CHAR    8
+#define HOST_BITS_PER_SHORT  16
+#define HOST_BITS_PER_INT    32
+#define HOST_BITS_PER_LONG   64
+#define HOST_BITS_PER_LONGLONG 64
+
+#define FALSE 0
+#define TRUE  1
+
+#define SUCCESS_EXIT_CODE 0
+#define FATAL_EXIT_CODE 33
+
+#define HAVE_VPRINTF
+#define HAVE_STRERROR
+#define POSIX
+
+/* macOS provides bcopy/bcmp/bzero via <string.h>.  */
+#define BSTRING
+
+#include "tm.h"