diff --git a/x11-wm/mangowc/Makefile b/x11-wm/mangowc/Makefile
index cdd04a4d9e69..b5eef5454b37 100644
--- a/x11-wm/mangowc/Makefile
+++ b/x11-wm/mangowc/Makefile
@@ -1,49 +1,61 @@
 PORTNAME=	mangowc
 DISTVERSION=	0.10.8
+PORTREVISION=	1
 CATEGORIES=	x11-wm
 
 MAINTAINER=	nivit@FreeBSD.org
 COMMENT=	Lightweight, high-performance Wayland compositor built on dwl
 WWW=		https://mangowc.vercel.app
 
 LICENSE=	CC0-1.0 GPLv3 MIT
 LICENSE_COMB=	multi
 LICENSE_FILE_CC0-1.0=	${WRKSRC}/LICENSE.tinywl
 LICENSE_FILE_GPLv3=	${WRKSRC}/LICENSE.dwl
 LICENSE_FILE_MIT=	${WRKSRC}/LICENSE.wlroots
 
 BUILD_DEPENDS=	hwdata>=0.399:misc/hwdata \
 		wayland-protocols>=1.24:graphics/wayland-protocols
 LIB_DEPENDS=	libdisplay-info.so:sysutils/libdisplay-info \
 		libdrm.so:graphics/libdrm \
 		libevdev.so:devel/libevdev \
 		libinput.so:x11/libinput \
 		libjson-c.so:devel/json-c \
 		libliftoff.so:graphics/libliftoff \
 		libpcre2-8.so:devel/pcre2 \
 		libpixman-1.so:x11/pixman \
 		libscenefx-0.4.so:x11-toolkits/scenefx04 \
 		libseat.so:sysutils/seatd \
 		libudev.so:devel/libudev-devd \
 		libwayland-egl.so:graphics/wayland \
 		libwlroots-0.19.so:x11-toolkits/wlroots019 \
 		libxcb-icccm.so:x11/xcb-util-wm \
 		libxcb.so:x11/libxcb \
 		libxkbcommon.so:x11/libxkbcommon
 
 RUN_DEPENDS=	hwdata>=0.399:misc/hwdata \
 		Xwayland:x11-servers/xwayland
 
 USES=		meson pkgconfig
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	DreamMaoMao
 
 SUB_FILES=	pkg-message
 
 PLIST_FILES=	bin/mango \
 		bin/mmsg \
-		etc/mango/config.conf \
+		"@sample etc/mango/config.conf.sample" \
 		share/wayland-sessions/mango.desktop
 
+post-patch:
+# Fix C flags
+# https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=275328
+	@${REINPLACE_CMD} -e 's/_POSIX_C_SOURCE=200809L/_XOPEN_SOURCE=700/' \
+		${WRKSRC}/meson.build
+
+# Install a sample copy of configuration file
+post-install:
+	@${CP} ${WRKSRC}/config.conf \
+		${STAGEDIR}${PREFIX}/etc/mango/config.conf.sample
+
 .include <bsd.port.mk>