Index: tools/gmp/Makefile
===================================================================
RCS file: /cvsroot/src/tools/gmp/Makefile,v
retrieving revision 1.5
diff -p -u -r1.5 Makefile
--- tools/gmp/Makefile	18 Sep 2021 01:47:10 -0000	1.5
+++ tools/gmp/Makefile	28 Sep 2024 20:11:26 -0000
@@ -9,6 +9,16 @@ CPPFLAGS+=	${HOST_CPPFLAGS}
 
 .include "${.CURDIR}/../Makefile.gnuhost"
 
+# GMP uses 8-byte alignment for 16-byte align-requiring things that break
+# the build on modern macOS targets, turn off assembly on x86-64 for now.
+# https://trac.macports.org/ticket/70859
+.if ${BUILD_OSTYPE} == "Darwin"
+BUILD_MACHINE!=	uname -m
+. if ${BUILD_MACHINE} == "x86_64"
+CONFIGURE_ARGS+=	--disable-assembly
+. endif
+.endif
+
 # Don't override CFLAGS and CXXFLAGS, it breaks ABI detection.
 # PATH needs special treating since "make" tries to expand $PATH
 # when variable is used.