diff --git a/scripts/mkpkg b/scripts/mkpkg
index b477c8053..7ec259a31 100755
--- a/scripts/mkpkg
+++ b/scripts/mkpkg
@@ -369,20 +369,34 @@ case "$osversion" in
 	    sdkvers=`echo "${osversion}" | sed -e 's/^macos\([0-9][0-9]\)\([0-9]*\)-.*$/\1.\2/' -e 's/\.$//'`
 	    # SDKs may be under Xcode.app or CommandLineTools (for non-Xcode)
 	    if [ -d "/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs" ]; then
-		SDK_DIR="/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs"
+		SDKS="/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs"
 	    elif [ -d "/Library/Developer/CommandLineTools/SDKs" ]; then
-		SDK_DIR="/Library/Developer/CommandLineTools/SDKs"
+		SDKS="/Library/Developer/CommandLineTools/SDKs"
 	    else
 		echo "unable to find macOS SDKs directory" 1>&2
 		exit 1
 	    fi
-	    SDK_DIR="${SDK_DIR}/MacOSX${sdkvers}.sdk"
-	    if [ -d "${SDK_DIR}" ]; then
-		SDK_FLAGS="-isysroot ${SDK_DIR} -mmacosx-version-min=${sdkvers}"
-	    else
-		echo "unable to find SDKs directory for macOS $sdkvers" 1>&2
-		exit 1
-	    fi
+	    while :; do
+		SDK_DIR="${SDKS}/MacOSX${sdkvers}.sdk"
+		if [ -d "${SDK_DIR}" ]; then
+		    SDK_FLAGS="-isysroot ${SDK_DIR} -mmacosx-version-min=${sdkvers}"
+		    break
+		fi
+		case "$sdkvers" in
+		*.00)
+		    # Try MacOSXMM.0.sdk
+		    sdkvers=${sdkvers%0}
+		    ;;
+		*.0)
+		    # Try MacOSXMM.sdk
+		    sdkvers=${sdkvers%.0}
+		    ;;
+		*)
+		    echo "missing $SDK_DIR" 1>&2
+		    exit 1
+		    ;;
+		esac
+	    done
 	fi
 	export CFLAGS="-O2 -g $ARCH_FLAGS $SDK_FLAGS"
 	export LDFLAGS="$ARCH_FLAGS $SDK_FLAGS"