diff --git a/.gitea/workflows/build-macos.yml b/.gitea/workflows/build-macos.yml
index f6efac7..f6b512f 100644
--- a/.gitea/workflows/build-macos.yml
+++ b/.gitea/workflows/build-macos.yml
@@ -41,6 +41,22 @@ jobs:
           export MACHTYPE=${{ matrix.machtype }}
           export HOSTTYPE=${{ matrix.arch }}
           export CCOPTFLAG="-O0 -Wno-error=implicit-function-declaration -Wno-error=incompatible-pointer-types -Wno-error=int-conversion -Wno-error=implicit-int"
+
+          # Pre-generate code-generator outputs using host compiler if needed
+          if [ ! -f tiff/libtiff/tif_fax3sm.c ]; then
+            echo "Pre-generating tiff/libtiff/tif_fax3sm.c using host compiler..."
+            (cd tiff && chmod +x configure && ./configure --disable-old-jpeg --disable-pixarlog --disable-zlib --disable-jbig --disable-lzma) >/dev/null 2>&1 || true
+            cc -Itiff/libtiff tiff/libtiff/mkg3states.c tiff/port/strcasecmp.c -o tiff/mkg3states
+            tiff/mkg3states -c const tiff/libtiff/tif_fax3sm.c
+            rm -f tiff/mkg3states
+          fi
+          if [ ! -f imdi/imdi_k.h ] || [ ! -f imdi/imdi_k.c ]; then
+            echo "Pre-generating imdi kernel files using host compiler..."
+            cc -Ih -Inumlib imdi/imdi_make.c imdi/imdi_gen.c imdi/cgen.c -o imdi/imdi_make
+            (cd imdi && ./imdi_make -f -d .)
+            rm -f imdi/imdi_make
+          fi
+
           jam -q -d2 -fJambase -j1 -sBUILTIN_TIFF=true -sBUILTIN_JPEG=true -sBUILTIN_PNG=true -sBUILTIN_Z=true -sBUILTIN_SSL=true install
           
       - name: Ad-hoc Sign & Verify Binaries
@@ -58,10 +74,26 @@ jobs:
           ARGYLL_NOT_INTERACTIVE: "1"
           ARGYLL_EXCLUDE_SERIAL_SCAN: "1"
         run: |
-          ./bin/dispcal -? || true
-          ./bin/chartread -? || true
-          ./bin/colprof -? || true
-          ./bin/targen -? || true
+          HOST_ARCH="$(uname -m)"
+          if [ "${{ matrix.arch }}" = "$HOST_ARCH" ]; then
+            echo "Running native execution smoke tests for ${{ matrix.arch }}..."
+            ./bin/dispcal -? || true
+            ./bin/chartread -? || true
+            ./bin/colprof -? || true
+            ./bin/targen -? || true
+          else
+            echo "Skipping execution smoke tests when cross-compiling (${{ matrix.arch }} on $HOST_ARCH)."
+          fi
+          echo "Verifying Mach-O binary architectures match ${{ matrix.arch }}:"
+          for f in bin/*; do
+            if [ -f "$f" ] && file "$f" | grep -q "Mach-O"; then
+              echo "$f: $(file -b "$f")"
+              if ! file "$f" | grep -q "${{ matrix.arch }}"; then
+                echo "ERROR: $f architecture does not match expected ${{ matrix.arch }}!"
+                exit 1
+              fi
+            fi
+          done
           
       - name: Package Release
         run: |
@@ -160,7 +192,11 @@ jobs:
           echo "=== Binary Architecture & Signature Verification ==="
           for file in bin/*; do
             if [ -f "$file" ] && file "$file" | grep -q "Mach-O"; then
-              file "$file"
+              echo "$file: $(file -b "$file")"
+              if ! file "$file" | grep -q "universal binary"; then
+                echo "ERROR: $file is not a universal binary!"
+                exit 1
+              fi
               codesign -dvv "$file"
             fi
           done
diff --git a/Jambase b/Jambase
index fa592c6..dd419f6 100755
--- a/Jambase
+++ b/Jambase
@@ -1045,7 +1045,25 @@ else if $(UNIX)
 		LINKFLAGS 		+= -framework Carbon ;		# default for .c
 		LINKFLAGS       += -framework Cocoa ;		# default for .m
 
-		if $(COMPILER) = "OSX10_6_X86_64BIT" {
+		if $(TARGET_ARCH) = "arm64"
+		 || $(HOSTTYPE) = "arm64"
+		 || $(MACHTYPE) = "arm64-apple-darwin" {
+			ECHO "Target architecture: macOS ARM 64-bit (arm64)" ;
+			TARGET64 = true ;
+			CCFLAGS += -arch arm64 ;
+			C++FLAGS += -arch arm64 ;
+			LINKFLAGS += -arch arm64 ;
+
+		} else if $(TARGET_ARCH) = "x86_64"
+		       || $(HOSTTYPE) = "x86_64"
+		       || $(MACHTYPE) = "x86_64-apple-darwin" {
+			ECHO "Target architecture: macOS Intel 64-bit (x86_64)" ;
+			TARGET64 = true ;
+			CCFLAGS += -arch x86_64 ;
+			C++FLAGS += -arch x86_64 ;
+			LINKFLAGS += -arch x86_64 ;
+
+		} else if $(COMPILER) = "OSX10_6_X86_64BIT" {
 			ECHO "We're cross compiling to OSX 10.6 AMD/Intel 64 bit" ;
 			# setup script needs to export MACOSX_DEPLOYMENT_TARGET="10.6"
 			# and                   export CROSS_CFLAGS=--target=x86_64-apple-macosx10.6.0
diff --git a/imdi/Jamfile b/imdi/Jamfile
index 2c0ec65..e1eb896 100755
--- a/imdi/Jamfile
+++ b/imdi/Jamfile
@@ -33,16 +33,18 @@ if $(NT) && $(MINGW64) {
 # imdi low level cgen test code
 Main ctest : ctest.c cgen.c ;
 
-# make imdi code program
-Main imdi_make : imdi_make.c imdi_gen.c cgen.c ;
-
 HDRS = ../h ../numlib ;
 LINKLIBS = ../numlib/libnum ;
 
-# GenFile source.c : program args ;	make custom file
-# Generate all the kernel files
-GenFileND imdi_k.h : imdi_make $(IMDI_MAKE_OPT) -d [ NormPaths $(DOT) ] ;
-Clean clean : imdi_k.c ;
+# make imdi code program
+if ! [ GLOB imdi : imdi_k.h ] || ! [ GLOB imdi : imdi_k.c ] {
+	Main imdi_make : imdi_make.c imdi_gen.c cgen.c ;
+
+	# GenFile source.c : program args ;	make custom file
+	# Generate all the kernel files
+	GenFileND imdi_k.h : imdi_make $(IMDI_MAKE_OPT) -d [ NormPaths $(DOT) ] ;
+	Clean clean : imdi_k.c ;
+}
 
 # imdi library
 Library libimdi : imdi.c imdi_tab.c ;
diff --git a/tiff/Jamfile b/tiff/Jamfile
index 571b1ef..f484d76 100755
--- a/tiff/Jamfile
+++ b/tiff/Jamfile
@@ -31,12 +31,14 @@ ObjectKeep port/getopt.c ;
 ObjectKeep port/strcasecmp.c ;
 
 # generation utilities (don't use libport ! - there will be dependency problems for Xcompile!)
-if $(UNIX) {
-	Main mkg3states : libtiff/mkg3states.c [ CatPaths port : strcasecmp.c ] ;
-} else {
-	Main mkg3states : libtiff/mkg3states.c [ CatPaths port : getopt.c strcasecmp.c ] ;
+if ! [ GLOB tiff/libtiff : tif_fax3sm.c ] {
+	if $(UNIX) {
+		Main mkg3states : libtiff/mkg3states.c [ CatPaths port : strcasecmp.c ] ;
+	} else {
+		Main mkg3states : libtiff/mkg3states.c [ CatPaths port : getopt.c strcasecmp.c ] ;
+	}
+	GenFileND libtiff/tif_fax3sm.c : mkg3states -c const [ NormPaths libtiff/tif_fax3sm.c ] ;
 }
-GenFileND libtiff/tif_fax3sm.c : mkg3states -c const [ NormPaths libtiff/tif_fax3sm.c ] ;
 
 # support library for tools
 if $(UNIX) {