diff --git a/graphics/dspdfviewer/Makefile b/graphics/dspdfviewer/Makefile
index 5b4a84fc55f9..be1524cd6d76 100644
--- a/graphics/dspdfviewer/Makefile
+++ b/graphics/dspdfviewer/Makefile
@@ -1,7 +1,7 @@
 PORTNAME=	dspdfviewer
 PORTVERSION=	1.15.1
 DISTVERSIONPREFIX=	v
-PORTREVISION=	56
+PORTREVISION=	57
 CATEGORIES=	graphics
 
 MAINTAINER=	fox@FreeBSD.org
@@ -13,7 +13,7 @@ LICENSE_FILE=	${WRKSRC}/COPYING
 LIB_DEPENDS=	libboost_program_options.so:devel/boost-libs \
 		libpoppler-qt5.so:graphics/poppler-qt5
 
-USES=		cmake:insource compiler:c++11-lang pkgconfig qt:5
+USES=		cmake:insource compiler:c++14-lang pkgconfig qt:5
 USE_QT=		core gui linguisttools widgets xml buildtools_build qmake_build
 USE_LDCONFIG=	yes
 
diff --git a/graphics/dspdfviewer/files/patch-cmake_compiler__clang.cmake b/graphics/dspdfviewer/files/patch-cmake_compiler__clang.cmake
new file mode 100644
index 000000000000..d2fb9893f7b2
--- /dev/null
+++ b/graphics/dspdfviewer/files/patch-cmake_compiler__clang.cmake
@@ -0,0 +1,11 @@
+--- cmake/compiler_clang.cmake.orig	2022-08-22 00:23:26 UTC
++++ cmake/compiler_clang.cmake
+@@ -1,7 +1,7 @@
+ # CMake fragment
+ 
+ # Clang
+-add_definitions("-std=c++11")
++add_definitions("-std=c++14")
+ 
+ # Turn on a lot of warnings, hopefully helping with code quality.
+ add_definitions(-Weverything)