diff --git a/lang/spidermonkey91/Makefile b/lang/spidermonkey91/Makefile
index a7a0594ff002..e47ca2abafe2 100644
--- a/lang/spidermonkey91/Makefile
+++ b/lang/spidermonkey91/Makefile
@@ -1,92 +1,94 @@
 PORTNAME=	spidermonkey
 DISTVERSION=	91.13.0
 PORTREVISION=	7
 CATEGORIES=	lang
 MASTER_SITES=	MOZILLA/firefox/releases/${DISTVERSION}esr/source
 PKGNAMESUFFIX=	${SP_VER}
 DISTNAME=	firefox-${DISTVERSION}esr.source
 
 MAINTAINER=	nc@FreeBSD.org
 COMMENT=	Standalone JavaScript based from Mozilla 91-esr
 WWW=		https://spidermonkey.dev/
 
 LICENSE=	MPL20
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
-BUILD_DEPENDS=	${LOCALBASE}/bin/python${PYTHON3_DEFAULT}:lang/python${PYTHON3_DEFAULT:S/.//g} \
-		${RUST_DEFAULT}>=1.35:lang/${RUST_DEFAULT} \
+BUILD_DEPENDS=	${RUST_DEFAULT}>=1.35:lang/${RUST_DEFAULT} \
 		autoconf2.13:devel/autoconf2.13 \
 		rust-cbindgen>=0.8.7:devel/rust-cbindgen
 LIB_DEPENDS=	libffi.so:devel/libffi \
 		libicudata.so:devel/icu \
 		libnspr4.so:devel/nspr
 
 USES=		compiler:c++17-lang gmake localbase pathfix pkgconfig \
-		python:3.7-3.10,build readline tar:xz
+		python:build readline tar:xz
 USE_LDCONFIG=	yes
 SP_VER=		91
 HAS_CONFIGURE=	yes
 
 WRKSRC=			${WRKDIR}/firefox-${DISTVERSION}/
 PATCH_WRKSRC=		${WRKDIR}/firefox-${DISTVERSION}/
 CONFIGURE_OUTSOURCE=	yes
-CONFIGURE_SCRIPT=	../firefox-${DISTVERSION}/js/src/configure
 
-CONFIGURE_ARGS=	--disable-debug \
+CONFIGURE_ARGS=	--enable-application=js \
+		--disable-debug \
 		--disable-debug-symbols \
 		--disable-gold \
 		--disable-jemalloc \
 		--disable-tests \
 		--enable-optimize \
 		--enable-readline \
 		--enable-shared-js \
 		--prefix=${PREFIX:Q} \
 		--target=${CONFIGURE_TARGET} \
 		--with-intl-api \
 		--with-system-icu \
 		--with-system-nspr \
 		--with-system-zlib
 
 CONFIGURE_ENV=	HOST_CC=${CC} \
 		HOST_CXX=${CXX}
 
 BINARY_ALIAS=	python3=${PYTHON_CMD}
 PLIST_SUB=	SP_VER=${SP_VER}
 
 .include <bsd.port.pre.mk>
 
 .if ${ARCH} == amd64
 CONFIGURE_TARGET=	x86_64-portbld-freebsd${OSREL}
 .elif ${ARCH} == powerpc
 EXTRA_PATCHES=	${FILESDIR}/extra-patch-config_makefiles_rust.mk
 .endif
 
 # Require newer Clang than what's in base system unless user opted out
 # or the base system is new enough.
 .if ${CHOSEN_COMPILER_TYPE} == gcc
 CONFIGURE_ENV+=	LLVM_CONFIG=llvm-config${LLVM_DEFAULT} \
 		LLVM_OBJDUMP=llvm-objdump${LLVM_DEFAULT}
 BUILD_DEPENDS+=	${LOCALBASE}/bin/llvm-objdump${LLVM_DEFAULT}:devel/llvm${LLVM_DEFAULT}
 USE_GCC=	yes
 .elif ${CC} == cc && ${CXX} == c++ && exists(/usr/lib/libc++.so) && \
 	${COMPILER_VERSION} < 80
 CPP=		${LOCALBASE}/bin/clang-cpp${LLVM_DEFAULT}
 CC=		${LOCALBASE}/bin/clang${LLVM_DEFAULT}
 CXX=		${LOCALBASE}/bin/clang++${LLVM_DEFAULT}
 CONFIGURE_ENV+=	LLVM_CONFIG=llvm-config${LLVM_DEFAULT} \
 		LLVM_OBJDUMP=llvm-objdump${LLVM_DEFAULT}
 BUILD_DEPENDS+=	${LOCALBASE}/bin/clang${LLVM_DEFAULT}:devel/llvm${LLVM_DEFAULT}
 .endif
 
-pre-configure:
-	(cd ${WRKSRC}/js/src/ && ${LOCALBASE}/bin/autoconf2.13)
-
 post-patch:
 	@${REINPLACE_CMD} -e 's|%%LOCALBASE%%|${LOCALBASE}|g' ${WRKSRC}/js/moz.configure
+	@${FIND} ${WRKSRC}/python/mozbuild -name *.py -exec \
+		${REINPLACE_CMD} 's|"rU"|"r"|g' {} \;
+
+pre-configure:
+	(cd ${WRKSRC} && ${LOCALBASE}/bin/autoconf2.13)
+	(cd ${WRKSRC}/js/src/ && ${LOCALBASE}/bin/autoconf2.13)
 
 post-install:
 	${RM} ${STAGEDIR}${PREFIX}/lib/libjs_static.ajs
 	${LN} -fs libmozjs-${SP_VER}.so ${STAGEDIR}${PREFIX}/lib/libmozjs-${SP_VER}.so.1
 	${STRIP_CMD} ${STAGEDIR}${PREFIX}/lib/libmozjs-${SP_VER}.*
 
 .include <bsd.port.post.mk>