diff --git a/graphics/cxxplot/Makefile b/graphics/cxxplot/Makefile
index 266825aa874b..69ee281c35ec 100644
--- a/graphics/cxxplot/Makefile
+++ b/graphics/cxxplot/Makefile
@@ -1,31 +1,34 @@
 PORTNAME=	cxxplot
 DISTVERSIONPREFIX=	v
 DISTVERSION=	0.3.0-2
 DISTVERSIONSUFFIX=	-g750b54b
 CATEGORIES=	graphics
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	C++ 2D plotting library
 WWW=		https://github.com/USNavalResearchLaboratory/cxxplot
 
 LICENSE=	BSD3CLAUSE
 LICENSE_FILE=	${WRKSRC}/license.txt
 
+# XXX Drop after FreeBSD 12.3 EOL around 2023-03-31
+.if exists(/usr/include/c++/v1) && !exists(/usr/include/c++/v1/concepts)
 BROKEN_FreeBSD_12=	build error: 'concepts' file not found
+.endif
 
 USES=		cmake:testing compiler:c++20-lang gl qt:5
 USE_QT=		core gui opengl printsupport widgets buildtools:build qmake:build
 USE_GL=		gl opengl
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	USNavalResearchLaboratory
 
 CMAKE_ON=		BUILD_SHARED_LIBS
 
 do-test: # 'make test' opens a lot of windows
 .for name in 01_test 02_test 03_test 04_test 05_test 06_test_csv 07_test_image
 	@${ECHO} "==> Running the test ${name}"
 	@${TEST_WRKSRC}/tests/${name}/libcxxplot_${name:C/test_.*/test/}
 .endfor
 
 .include <bsd.port.mk>