diff --git a/x11-wm/mangowc/Makefile b/x11-wm/mangowc/Makefile
index b607a0c04fe4..65fa539338f3 100644
--- a/x11-wm/mangowc/Makefile
+++ b/x11-wm/mangowc/Makefile
@@ -1,61 +1,63 @@
 PORTNAME=	mangowc
-DISTVERSION=	0.12.2
+DISTVERSION=	0.12.3
 PORTREVISION=	0
 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
 
+MESON_ARGS=	-Dsysconfdir=${PREFIX}/etc
+
 SUB_FILES=	pkg-message
 
 PLIST_FILES=	bin/mango \
 		bin/mmsg \
 		"@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>
diff --git a/x11-wm/mangowc/distinfo b/x11-wm/mangowc/distinfo
index b0fcae1646ab..3d9de9852898 100644
--- a/x11-wm/mangowc/distinfo
+++ b/x11-wm/mangowc/distinfo
@@ -1,3 +1,3 @@
-TIMESTAMP = 1770975720
-SHA256 (DreamMaoMao-mangowc-0.12.2_GH0.tar.gz) = b2e6d0cad2eb4a18e0098c45f5f961a81ddd8b37027bd61c25b5e24473c62d66
-SIZE (DreamMaoMao-mangowc-0.12.2_GH0.tar.gz) = 414227
+TIMESTAMP = 1771427762
+SHA256 (DreamMaoMao-mangowc-0.12.3_GH0.tar.gz) = 140b1b625e56034c1f042f850364bba7d0c630fea027459eb44fe46c37bcd0f6
+SIZE (DreamMaoMao-mangowc-0.12.3_GH0.tar.gz) = 415574
diff --git a/x11-wm/mangowc/files/patch-meson.build b/x11-wm/mangowc/files/patch-meson.build
new file mode 100644
index 000000000000..69f9787894de
--- /dev/null
+++ b/x11-wm/mangowc/files/patch-meson.build
@@ -0,0 +1,30 @@
+--- meson.build.orig	2026-02-18 05:26:24 UTC
++++ meson.build
+@@ -12,12 +12,16 @@ endif
+     endif
+ endif
+ 
++osname = build_machine.system()
++
+ prefix = get_option('prefix')
+ sysconfdir = get_option('sysconfdir')
+ 
+ # 如果 sysconfdir 以 prefix 开头，去掉 prefix
+-if sysconfdir.startswith(prefix) and not is_nixos
+-  sysconfdir = sysconfdir.substring(prefix.length())
++if sysconfdir.startswith(prefix) and not is_nixos and osname != 'freebsd'
++  # this fails with: Unknown method "length" in object <[OptionStringHolder] holds [OptionString]
++  # sysconfdir = sysconfdir.substring(prefix.length())
++  sysconfdir = sysconfdir.replace(prefix, '')
+   # 确保 sysconfdir 是绝对路径
+   if not sysconfdir.startswith('/')
+     sysconfdir = '/' + sysconfdir
+@@ -72,7 +76,7 @@ c_args = [
+   '-DWLR_USE_UNSTABLE',
+   '-D_POSIX_C_SOURCE=200809L',
+   '-DVERSION="@0@"'.format(version_with_hash),
+-  '-DSYSCONFDIR="@0@"'.format('/etc'),
++  '-DSYSCONFDIR="@0@"'.format(sysconfdir),
+ ]
+ 
+ # 仅在 debug 选项启用时添加调试参数