diff --git a/science/fasthenry/Makefile b/science/fasthenry/Makefile
index 348d94ffe0b2..80607152dfb5 100644
--- a/science/fasthenry/Makefile
+++ b/science/fasthenry/Makefile
@@ -1,45 +1,50 @@
 PORTNAME=	fasthenry
 DISTVERSION=	3.0wr-031424
+PORTREVISION=	1
 CATEGORIES=	science cad
 MASTER_SITES=	http://www.wrcad.com/ftp/pub/
 
 MAINTAINER=	ports@FreeBSD.org
 COMMENT=	Multipole-accelerated inductance analysis program
 WWW=		https://www.rle.mit.edu/cpg/research_codes.htm
 
 LICENSE=	MIT
 
-USES=			gmake
-USE_GCC=		yes
+USES=		gmake
 
 HAS_CONFIGURE=		yes
 CONFIGURE_SCRIPT=	config
+CONFIGURE_ARGS=		freebsd
 
 # Fix build with clang11
 CFLAGS+=	-fcommon
 # Use malloc
 CFLAGS+=	-DNO_SBRK
 
-BINARY_ALIAS=		gcc=gcc${GCC_DEFAULT} make=gmake
+BINARY_ALIAS=	make=gmake
 
-WRKSRC=			${WRKDIR}/fasthenry-3.0wr
+WRKSRC=		${WRKDIR}/fasthenry-3.0wr
 
 OPTIONS_DEFINE=	DOCS EXAMPLES
 
+post-patch:
+	@${REINPLACE_CMD} -Ee '/CFLAGS =/{s/=/+=/;}' \
+	${WRKSRC}/src/sparse/Makefile
+
 do-install:
 	${INSTALL_PROGRAM} ${WRKSRC}/bin/fasthenry ${STAGEDIR}${PREFIX}/bin/
 	${INSTALL_PROGRAM} ${WRKSRC}/bin/zbuf ${STAGEDIR}${PREFIX}/bin
 
 do-install-DOCS-on:
 	@${MKDIR} ${STAGEDIR}${DOCSDIR}
 	${CAT} ${WRKSRC}/README ${WRKSRC}/README.mit > ${STAGEDIR}${DOCSDIR}/readme
 	${INSTALL_DATA} ${WRKSRC}/doc/nonuniform_manual.pdf ${STAGEDIR}${DOCSDIR}
 	${INSTALL_DATA} ${WRKSRC}/doc/fasthenry_manual.pdf ${STAGEDIR}${DOCSDIR}
 	${INSTALL_DATA} ${WRKSRC}/doc/ms_thesis.pdf ${STAGEDIR}${DOCSDIR}
 	${GZIP_CMD} ${STAGEDIR}${DOCSDIR}/*
 
 do-install-EXAMPLES-on:
 	@${MKDIR} ${STAGEDIR}${EXAMPLESDIR}
 	@cd ${WRKSRC}/examples/ && ${COPYTREE_SHARE} . ${STAGEDIR}${EXAMPLESDIR}
 
 .include <bsd.port.mk>
diff --git a/science/fasthenry/files/patch-src__mk_syscfg__mk_freebsd.inc b/science/fasthenry/files/patch-src__mk_syscfg__mk_freebsd.inc
new file mode 100644
index 000000000000..4cda88f7ccd5
--- /dev/null
+++ b/science/fasthenry/files/patch-src__mk_syscfg__mk_freebsd.inc
@@ -0,0 +1,37 @@
+--- /dev/null	2026-04-04 21:53:35.827546000 +0000
++++ src/mk_syscfg/mk_freebsd.inc	2026-04-04 21:52:38.905644000 +0000
+@@ -0,0 +1,34 @@
++# These CFLAGS should be fine for anything that is reasonably recent
++# except for MinGW.
++
++# Check AVX (parallel math support), for x86_64 only.  We're going to
++# assume the compiler is gcc compatible, you'll need to comment this
++# if a non-compatible compiler is used.  Allow AVX if the gcc version
++# is 4.8 or later.  This should also work for macOS clang on Intel
++# Macs.
++
++ARCH := $(shell uname -m)
++
++ifeq ($(ARCH),amd64)
++    HAVX = 1
++endif
++
++# If you build with AVX enabled, and run on a system that does not
++# have AVX, the program will crash.  If is not likely that you would
++# want to run fasthenry on such a machine as it is probably slow, but
++# to force build without AVX comment the next three lines below. 
++# There seems to be no way to accommodate the presence/absence of AVX
++# at run-time nicely.
++
++ifeq "$(HAVX)" "1"
++    MAVX = -mavx -DWITH_AVX
++endif
++
++CFLAGS += -O3 -DFOUR $(MAVX) 
++
++# For debugging.
++#CFLAGS = -O -g -DFOUR $(MAVX)
++
++# For profiling.
++#CFLAGS = -pg -g  -DFOUR $(MAVX)
++