diff --git a/math/librsb/Makefile b/math/librsb/Makefile
index 5a58c4fc3a5a..6fa5cc695476 100644
--- a/math/librsb/Makefile
+++ b/math/librsb/Makefile
@@ -1,37 +1,43 @@
 # Created by: stephen@FreeBSD.org
 
 PORTNAME=	librsb
 PORTVERSION=	1.2.0.10
-PORTREVISION=	2
+PORTREVISION=	3
 CATEGORIES=	math
 MASTER_SITES=	SF/librsb
 DISTNAME=	${PORTNAME}-${PORTVERSION:S/r/-rc/}
 
 MAINTAINER=	stephen@FreeBSD.org
 COMMENT=	Sparse matrix library
 
 LICENSE=	GPLv3
 LICENSE_FILE=	${WRKSRC}/COPYING
 
 BUILD_DEPENDS=	gsed:textproc/gsed \
 		bash:shells/bash
 
 USES=		fortran gmake shebangfix libtool
 USE_GCC=	yes
 INSTALL_TARGET=	install-strip
 TEST_TARGET=	qtests
 GNU_CONFIGURE=	yes
 CFLAGS+=	-fPIC
 CONFIGURE_ARGS=	--enable-fortran-module-install \
 		--enable-matrix-types="double, double complex"
+CONFIGURE_ENV=	CFLAGS= SPCFLAGS="${CFLAGS}"
 SHEBANG_FILES=	scripts/*.sh examples/make.sh.in
 USE_LDCONFIG=	yes
 
-MANUAL_PACKAGE_BUILD=	Optimizes for the local machine
+OPTIONS_DEFINE=	DOCS OPTIMIZE
 
-OPTIONS_DEFINE=	DOCS
+OPTIMIZE_DESC=		Optimize for the local machine
+OPTIMIZE_CONFIGURE_ENV=	SPCFLAGS="${CFLAGS:N-O*}"
 
 post-patch:
 	@${REINPLACE_CMD} -E s/sed/gsed/g ${WRKSRC}/scripts/*.sh
 
+post-patch-OPTIMIZE-on:
+	@${REINPLACE_CMD} s/enable_optimize=no/enable_optimize=yes/ \
+		${WRKSRC}/configure
+
 .include <bsd.port.mk>
diff --git a/math/librsb/distinfo b/math/librsb/distinfo
index cd5cda99cf71..b4d70ad54599 100644
--- a/math/librsb/distinfo
+++ b/math/librsb/distinfo
@@ -1,3 +1,3 @@
-TIMESTAMP = 1631809564
-SHA256 (librsb-1.2.0.10.tar.gz) = 6cfe102e92132d434ddb289782f902b57eab43fd8ca054830b0d4d162ea78829
-SIZE (librsb-1.2.0.10.tar.gz) = 2396127
+TIMESTAMP = 1634308494
+SHA256 (librsb-1.2.0.10.tar.gz) = ec49f3f78a7c43fc9e10976593d100aa49b1863309ed8fa3ccbb7aad52d2f7b8
+SIZE (librsb-1.2.0.10.tar.gz) = 2396145