diff --git a/SysBuild/tools/doctools b/SysBuild/tools/doctools
index b2dcd44..133caa8 100644
--- a/SysBuild/tools/doctools
+++ b/SysBuild/tools/doctools
@@ -80,8 +80,18 @@ premk() {
 
 #Hier wird der Make Prozess der Sourcen definiert
 mk() {
-	make -k -j $NUMCPU USE_ARCH=$UARCH PREFIX=/usr \
-	                PERL=/usr/bin/perl 
+	if [ "$MK64BIT" == "true" ]; then
+		make -k -j $NUMCPU \
+	           	USE_ARCH=$UARCH \
+		   	PREFIX=/usr \
+	           	CXXFLAGS="$BUILDOPTIONS32 -std=gnu++98" \
+		   	PERL=/usr/bin/perl 
+	else
+		make -k -j $NUMCPU \
+	           	USE_ARCH=$UARCH \
+		   	PREFIX=/usr \
+		   	PERL=/usr/bin/perl 
+	fi
 	make -k USE_ARCH=$UARCH PREFIX=$TMPROOT/usr \
 	                PERL=/usr/bin/perl install 
 }