diff --git a/math/dqfun/Makefile b/math/dqfun/Makefile
new file mode 100644
index 0000000000000..a2a5fa1b0e2e1
--- /dev/null
+++ b/math/dqfun/Makefile
@@ -0,0 +1,54 @@
+PORTNAME=	dqfun
+DISTVERSIONPREFIX=v
+DISTVERSION=	03
+CATEGORIES=	math
+MASTER_SITES=	https://www.davidhbailey.com/dhbsoftware/
+
+MAINTAINER=	fortran@FreeBSD.org
+COMMENT=	Double-quad precision package with special functions
+WWW=		https://crd-legacy.lbl.gov/~dhbailey/mpdist
+
+LICENSE=	BSD3CLAUSE
+LICENSE_FILE=	${WRKSRC}/DISCLAIMER.txt
+
+USES=		fortran
+
+BINARY_ALIAS=	gfortran=${FC}
+FFLAGS+=	-O3
+BUILD_WRKSRC=	${WRKSRC}/fortran
+
+OPTIONS_DEFINE=	DOCS EXAMPLES
+
+pre-configure:
+.for f in gnu-complib-dq.scr gnu-complink-dq.scr
+	${REINPLACE_CMD} -e 's|-O3|${FFLAGS}|' ${BUILD_WRKSRC}/${f}
+.endfor
+
+do-build:
+	cd ${BUILD_WRKSRC} && ${SETENV} ${MAKE_ENV} ./gnu-complib-dq.scr
+
+do-build-EXAMPLES-on:
+	cd ${BUILD_WRKSRC} &&	\
+		${SETENV} ${MAKE_ENV} ./gnu-complink-dq.scr tpslqm1dq
+
+do-install:
+	${MKDIR} ${STAGEDIR}${PREFIX}/include
+	cd ${BUILD_WRKSRC} &&	\
+	${INSTALL_DATA} *.mod ${STAGEDIR}${PREFIX}/include
+
+do-install-EXAMPLES-on:
+	${MKDIR} ${STAGEDIR}${EXAMPLESDIR}
+	cd ${BUILD_WRKSRC} &&	\
+	${INSTALL_PROGRAM} tpslqm1dq ${STAGEDIR}${EXAMPLESDIR}	&&	\
+	${INSTALL_DATA} tpslqm1dq.f90 ${STAGEDIR}${EXAMPLESDIR}
+
+do-install-DOCS-on:
+	${MKDIR} ${STAGEDIR}${DOCSDIR}
+	${INSTALL_DATA} ${WRKSRC}/README-dqfun.txt ${STAGEDIR}${DOCSDIR}
+	cd ${BUILD_WRKSRC} &&	\
+	${INSTALL_DATA} *.ref.txt ${STAGEDIR}${DOCSDIR}
+
+do-test:
+	cd ${BUILD_WRKSRC} && ${SETENV} ${MAKE_ENV} ./gnu-dqfun-tests.scr
+
+.include <bsd.port.mk>
diff --git a/math/dqfun/distinfo b/math/dqfun/distinfo
new file mode 100644
index 0000000000000..ddaeb76cc1223
--- /dev/null
+++ b/math/dqfun/distinfo
@@ -0,0 +1,3 @@
+TIMESTAMP = 1699200080
+SHA256 (dqfun-v03.tar.gz) = 3ad51ea391dfbfe69c0f84ef988fe136d5910a2cafe860ddc6c78d3589468295
+SIZE (dqfun-v03.tar.gz) = 99019
diff --git a/math/dqfun/pkg-descr b/math/dqfun/pkg-descr
new file mode 100644
index 0000000000000..6416f2a3345f6
--- /dev/null
+++ b/math/dqfun/pkg-descr
@@ -0,0 +1,10 @@
+DQFUN: A double-quad precision package with special functions (approximately 66
+digit precision).
+
+This package permits one to perform floating-point computations (real and
+complex) to double-quad precision (approximately 65 digits), by making only
+relatively minor changes to existing Fortran programs. All basic arithmetic
+operations and transcendental functions are supported, together with numerous
+special functions. The package should run correctly on any Unix-based system
+supporting a Fortran-2008 compiler and IEEE 128-bit floating-point arithmetic
+(in hardware or software).
diff --git a/math/dqfun/pkg-plist b/math/dqfun/pkg-plist
new file mode 100644
index 0000000000000..feec48d87a4ad
--- /dev/null
+++ b/math/dqfun/pkg-plist
@@ -0,0 +1,10 @@
+include/dqfuna.mod
+include/dqfune.mod
+include/dqmodule.mod
+%%PORTDOCS%%%%DOCSDIR%%/README-dqfun.txt
+%%PORTDOCS%%%%DOCSDIR%%/testdqfun.ref.txt
+%%PORTDOCS%%%%DOCSDIR%%/tpphixdq.ref.txt
+%%PORTDOCS%%%%DOCSDIR%%/tpslqm1dq.ref.txt
+%%PORTDOCS%%%%DOCSDIR%%/tquaddq.ref.txt
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/tpslqm1dq
+%%PORTEXAMPLES%%%%EXAMPLESDIR%%/tpslqm1dq.f90