diff --git a/graphics/xaos/Makefile b/graphics/xaos/Makefile
index 6737eb5d142f..4f5d8dc757d6 100644
--- a/graphics/xaos/Makefile
+++ b/graphics/xaos/Makefile
@@ -1,63 +1,63 @@
 # Created by: Joseph Koshy <koshy@india.hp.com>
 
 PORTNAME=	xaos
 DISTVERSIONPREFIX=	release-
 DISTVERSION=	4.2.1
 PORTREVISION=	1
 CATEGORIES=	graphics math
 
-MAINTAINER=	ports@FreeBSD.org
+MAINTAINER=	joerg.preiss@slesa.de
 COMMENT=	Real-time interactive fractal browser
 
 LICENSE=	GPLv2
 LICENSE_FILE=	${WRKSRC}/COPYING
 
 USES=		compiler:c++11-lang gl qmake qt:5
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	xaos-project
 GH_PROJECT=	XaoS
 
 USE_GL=		gl
 USE_QT=		core gui opengl widgets buildtools_build linguisttools_build
 
 QMAKE_ARGS+=	INCLUDEPATH+=${LOCALBASE}/include \
 		LIBS+=-L${LOCALBASE}/lib
 
 DESKTOP_ENTRIES=	"XaoS" \
 			"" \
 			"${PREFIX}/share/pixmaps/xaos.png" \
 			"xaos" \
 			"" \
 			false
 
 OPTIONS_DEFINE=		EXAMPLES NLS TUTORIAL
 OPTIONS_DEFAULT=	TUTORIAL
 OPTIONS_SUB=		yes
 
 TUTORIAL_DESC=	Tutorial fractal sequences
 
 post-install:
 	# HACK: original "install" target missing
 	${INSTALL_PROGRAM} ${WRKSRC}/bin/xaos ${STAGEDIR}${PREFIX}/bin/xaos
 	${INSTALL_DATA} ${WRKSRC}/src/ui/images/xaosbig.png \
 		${STAGEDIR}${PREFIX}/share/pixmaps/xaos.png
 	${INSTALL_MAN} ${WRKSRC}/doc/xaos.6 \
 		${STAGEDIR}${MANPREFIX}/share/man/man6/xaos.6
 
 post-install-EXAMPLES-on:
 	(cd ${WRKSRC}/examples && ${COPYTREE_SHARE} . ${STAGEDIR}${EXAMPLESDIR})
 
 post-install-NLS-on:
 	# catalogs
 	(cd ${WRKSRC}/catalogs && \
 		${COPYTREE_SHARE} . ${STAGEDIR}${PREFIX}/share/XaoS/catalogs)
 	# translation files
 	(cd ${WRKSRC}/i18n && ${COPYTREE_SHARE} \
 		"*.qm" ${STAGEDIR}${PREFIX}/share/XaoS/i18n)
 
 post-install-TUTORIAL-on:
 	(cd ${WRKSRC}/tutorial && \
 		${COPYTREE_SHARE} . ${STAGEDIR}${PREFIX}/share/XaoS/tutorial)
 
 .include <bsd.port.mk>
diff --git a/graphics/xaos/files/patch-src_ui_main.cpp b/graphics/xaos/files/patch-src_ui_main.cpp
new file mode 100644
index 000000000000..edf3d3fdaef5
--- /dev/null
+++ b/graphics/xaos/files/patch-src_ui_main.cpp
@@ -0,0 +1,10 @@
+--- src/ui/main.cpp.orig	2021-01-18 09:29:00 UTC
++++ src/ui/main.cpp
+@@ -23,6 +23,7 @@
+ #include <cctype>
+ #include <cerrno>
+ #include <climits>
++#include <clocale>
+ #include <cmath>
+ #include <csignal>
+ #include <cstdlib>