Do not second-guess MacPorts about which SDK, arches, or deployment
target to use.
--- Makefile.in.orig	2018-04-12 22:19:10.000000000 -0500
+++ Makefile.in	2021-03-14 21:02:21.000000000 -0500
@@ -14,10 +14,7 @@
 
 CC=		@CC@
 FRAMEWORKS=	-framework ApplicationServices -framework CoreFoundation
-OPTOPTS=	-isysroot @macosx_sdk@ \
-			@macosx_arches@ \
-			-mmacosx-version-min=@macosx_dep_target@ \
-			@OPTOPTS@
+OPTOPTS=	@OPTOPTS@
 
 LIBS=		@LIBS@
 LDFLAGS=	@LDFLAGS@ ${LIBS}
--- configure.ac.orig	2018-04-12 22:19:10.000000000 -0500
+++ configure.ac	2021-03-14 21:02:13.000000000 -0500
@@ -15,8 +15,6 @@
 AC_PROG_INSTALL
 
 AC_CANONICAL_SYSTEM
-DUTI_CHECK_SDK
-DUTI_CHECK_DEPLOYMENT_TARGET
 
 # function checks
 AC_CHECK_FUNC(strlcpy,have_strlcpy=yes,)
