diff --git a/benchmarks/imb/Makefile b/benchmarks/imb/Makefile
index 55aa3d536652..d416c128d0a8 100644
--- a/benchmarks/imb/Makefile
+++ b/benchmarks/imb/Makefile
@@ -1,65 +1,66 @@
 PORTNAME=	IMB
 DISTVERSIONPREFIX=	IMB-v
 DISTVERSION=	2021.11
+PORTREVISION=	2
 CATEGORIES=	benchmarks parallel
 
 MAINTAINER=	laurent@FreeBSD.org
-COMMENT=	Intel(R) MPI Benchmark
+COMMENT=	Intel(R) MPI Benchmarks
 WWW=		https://software.intel.com/en-us/imb-user-guide
 
 LICENSE=	BSD3CLAUSE
 LICENSE_FILE=	${WRKSRC}/license/license.txt
 
 NOT_FOR_ARCHS=	armv7 i386 powerpc
 NOT_FOR_ARCHS_REASON=	64-bit size_t assumed in various places
 
 FLAVORS=		mpich openmpi
 FLAVOR?=		${FLAVORS:[1]}
 openmpi_PKGNAMESUFFIX=	-openmpi
 
-USES=		gmake localbase mpi:${FLAVOR}
+USES=		gmake localbase mpi:${FLAVOR} pkgconfig
 USE_CXXSTD=	c++14
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	intel
 GH_PROJECT=	mpi-benchmarks
 
 MAKE_ENV=	MPI_HOME=${MPI_HOME}
 
 # Intel hardcodes -O3 in make_mpich.  Replacing it with system defaults
 # would make it impossible to compare benchmark results with other systems.
 # By putting it here we make it easier for somebody to change it, if they
 # _really_ want it.
 OPT_CFLAGS=	-O3
 CFLAGS+=	${OPT_CFLAGS} ${MPI_CFLAGS}
 CXXFLAGS+=	-fopenmp
 LDFLAGS+=	-Wl,-rpath,/lib ${MPI_LIBS} -fopenmp
 
 CC=		${MPICC}
 CXX=		${MPICXX}
 DOCSDIR=	${PREFIX}/share/doc/${PORTNAME}-${FLAVOR}
 BINARY_ALIAS=	make=${GMAKE}
 
 PLIST_SUB=	FLAVOR=${FLAVOR}
 
 OPTIONS_DEFINE=	CHECK_RESULTS DOCS
 
 # Attention: -DCHECK results are not valid as real benchmark data! Don't
 # forget to deactivate DCHECK and recompile in order to get proper results.
 CHECK_RESULTS_DESC=	Check results (not valid as real benchmark data)
 CHECK_RESULTS_CFLAGS=	-DCHECK
 
 do-install:
 	@for benchmark in ${WRKSRC}/IMB-*; do \
 		${INSTALL_PROGRAM} $${benchmark} \
 			${STAGEDIR}${PREFIX}/bin/$${benchmark##*/}-${FLAVOR}; \
 	done
 
 do-install-DOCS-on:
 	@${MKDIR} ${STAGEDIR}${DOCSDIR}
 	${INSTALL_DATA} ${WRKSRC}/ReadMe_IMB.txt ${STAGEDIR}${DOCSDIR}
 	${INSTALL_DATA} ${WRKSRC}/license/third-party-programs.txt ${STAGEDIR}${DOCSDIR}
 	${INSTALL_DATA} ${WRKSRC}/license/use-of-trademark-license.txt \
 		${STAGEDIR}${DOCSDIR}
 
 .include <bsd.port.mk>
diff --git a/benchmarks/imb/files/patch-src__c_IMB__mem__manager.c b/benchmarks/imb/files/patch-src__c_IMB__mem__manager.c
new file mode 100644
index 000000000000..9237e70bd7bc
--- /dev/null
+++ b/benchmarks/imb/files/patch-src__c_IMB__mem__manager.c
@@ -0,0 +1,11 @@
+--- src_c/IMB_mem_manager.c.orig	2026-06-21 10:42:08 UTC
++++ src_c/IMB_mem_manager.c
+@@ -424,7 +424,7 @@ ------------------------------------------------------
+     IMB_i_alloc(int, c_info->g_ranks, c_info->w_num_procs, "Init_Pointers 1");
+     IMB_i_alloc(int, c_info->g_sizes, c_info->w_num_procs, "Init_Pointers 2");
+ 
+-#if (defined MPI1 || defined NBC || defined MPI4)
++#if (defined MPI1 || defined NBC || defined MPI4 || defined MPIIO)
+     IMB_i_alloc(int, c_info->sndcnt, c_info->w_num_procs, "Init_Pointers 3");
+     IMB_i_alloc(int, c_info->sdispl, c_info->w_num_procs, "Init_Pointers 4");
+