diff --git a/math/igraph/Makefile b/math/igraph/Makefile
index 49082e255801..991293edf933 100644
--- a/math/igraph/Makefile
+++ b/math/igraph/Makefile
@@ -1,30 +1,35 @@
 # Created by: Wen Heping <wenheping@gmail.com>
 
 PORTNAME=	igraph
 PORTVERSION=	0.9.5
 CATEGORIES=	math
 
 MAINTAINER=	wen@FreeBSD.org
 COMMENT=	Package For Manipulating Undirected And Directed Graphs
 
 LICENSE=	GPLv2
 
 LIB_DEPENDS=	libarpack.so:math/arpack-ng \
 		libcxsparse.so:math/suitesparse-cxsparse \
 		libglpk.so:math/glpk \
 		libgmp.so:math/gmp \
 		libopenblas.so:math/openblas
 
 USES=		bison cmake cpe gnome libtool pathfix
 USE_GITHUB=	yes
 USE_GNOME=	libxml2
 USE_LDCONFIG=	yes
 
 CMAKE_ON=	BUILD_SHARED_LIBS
 
 BINARY_ALIAS=	git=false
 
 pre-configure:
 	@${ECHO} ${PORTVERSION} > ${WRKSRC}/IGRAPH_VERSION
 
-.include <bsd.port.mk>
+.include <bsd.port.pre.mk>
+.if ${OSVERSION} >= 1300000 && ${OSVERSION} < 1300523
+EXTRA_PATCHES=	${PATCHDIR}/extra-patch-etc_cmake_compilers.cmake
+.endif
+
+.include <bsd.port.post.mk>
diff --git a/math/igraph/files/extra-patch-etc_cmake_compilers.cmake b/math/igraph/files/extra-patch-etc_cmake_compilers.cmake
new file mode 100644
index 000000000000..84b1f3c4b264
--- /dev/null
+++ b/math/igraph/files/extra-patch-etc_cmake_compilers.cmake
@@ -0,0 +1,10 @@
+--- etc/cmake/compilers.cmake.orig	2022-01-04 06:55:25 UTC
++++ etc/cmake/compilers.cmake
+@@ -31,7 +31,6 @@ macro(use_all_warnings TARGET_NAME)
+     target_compile_options(${TARGET_NAME} PRIVATE
+       # GCC-style compilers:
+       $<$<C_COMPILER_ID:GCC,Clang,AppleClang,Intel>:
+-        $<$<BOOL:${IGRAPH_WARNINGS_AS_ERRORS}>:-Werror>
+         -Wall -Wextra -pedantic
+         -Wno-unused-function -Wno-unused-parameter -Wno-sign-compare
+       >