Ticket #61435: use_xcode-fix.diff

src/port1.0/portmain.tcl

@@ -164 +164 @@
 default worksymlink {[file normalize [file join $portpath work]]}
 default distpath {[file normalize [file join $portdbpath distfiles ${dist_subdir}]]}
 
-default use_xcode {[expr {[option build.type] eq "xcode" || ![file exists /usr/lib/libxcselect.dylib] || ![file executable /Library/Developer/CommandLineTools/usr/bin/make]}]}
+default use_xcode {[expr {[option build.type] eq "xcode" || !([file exists /usr/lib/libxcselect.dylib] || [option os.major] >= 20) || ![file executable /Library/Developer/CommandLineTools/usr/bin/make]}]}
 
 proc portmain::main {args} {
     return 0