diff --git a/fab/drl2gerber b/fab/drl2gerber
index b39aedb..3945c12 100755
--- a/fab/drl2gerber
+++ b/fab/drl2gerber
@@ -12,32 +12,51 @@
 #
 
 
-print "G04 MACHINE-GENERATED FROM DRILL FILE*\n" || die;
-print "G01*\n" || die;		# linear Interpolation
-print "G70*\n" || die;		# inch units
-print "G90*\n" || die;		# absolute Mode
-print "%MOIN*%*\n" || die;	# inches, RS274X-style
-print "%FSLAX34Y34*%\n" || die;	# format
+sub begin
+{
+	return if $began;
+	$began = 1;
+
+	print "G04 MACHINE-GENERATED FROM DRILL FILE*\n" || die;
+	print "G01*\n" || die;		# linear Interpolation
+	print "G70*\n" || die;		# inch units
+	print "G90*\n" || die;		# absolute Mode
+	if ($mm) {
+		print "%MOMM*%*\n" || die;	# millimeters, RS274X-style
+	} else {
+		print "%MOIN*%*\n" || die;	# inches, RS274X-style
+	}
+	print "%FSLAX34Y34*%\n" || die;	# format
+}
 
 while (<>) {
 	chop;
+	if (/^METRIC/) {
+		$mm = 1;
+		next;
+	}
 	if (/^T(\d+)C/) {
+		&begin;
 		print "%ADD", $1 + 10, "C,$'*%\n" || die;
 		next;
 	}
 	if (/^T(\d+)$/) {
+		&begin;
 		print "G54D", $1 + 10, "*\n" || die;
 		next;
 	}
 	if (/^X([-0-9.]+)Y([-0-9.]+)$/) {
+		&begin;
 		printf("X%dY%dD03*\n", $1 * 10000, $2 * 10000) || die;
 		next;
 	}
 	if (/^X([-0-9.]+)Y([-0-9.]+)G85X([-0-9.]+)Y([-0-9.]+)$/) {
+		&begin;
 		printf("X%dY%dD02*\nX%dY%dD01*\n",
 		    $1 * 10000, $2 * 10000, $3 * 10000, $4 * 10000) || die;
 		next;
 	}
 }
 
+&begin;
 print "M02*\n" || die;