vim configure.ac for macOS 10.15 or later

configure.ac.patch

diff --git a/src/configure.ac b/src/configure.ac
index 2037de74f..007ff71f5 100644
--- a/src/configure.ac
+++ b/src/configure.ac
@@ -1817,7 +1817,7 @@ if test "$enable_tclinterp" = "yes" -o "$enable_tclinterp" = "dynamic"; then
 	tclinc="$tclloc/include $tclloc/include/tcl $tclloc/include/tcl$tclver /usr/local/include /usr/local/include/tcl$tclver /usr/include /usr/include/tcl$tclver"
       else
 	dnl For Mac OS X 10.3, use the OS-provided framework location
-	tclinc="/System/Library/Frameworks/Tcl.framework/Headers"
+        tclinc="`xcrun --show-sdk-path`/usr/include"
       fi
       TCL_INC=
       for try in $tclinc; do
@@ -1838,7 +1838,7 @@ if test "$enable_tclinterp" = "yes" -o "$enable_tclinterp" = "dynamic"; then
 	  tclcnf="$tclcnf `echo $tclinc | sed s/include/lib64/g`"
 	else
 	  dnl For Mac OS X 10.3, use the OS-provided framework location
-	  tclcnf="/System/Library/Frameworks/Tcl.framework"
+          tclcnf="`xcrun --show-sdk-path`/System/Library/Frameworks/Tcl.framework/Versions/$tclver"
 	fi
 	for try in $tclcnf; do
 	  if test -f "$try/tclConfig.sh"; then
@@ -1854,6 +1854,10 @@ if test "$enable_tclinterp" = "yes" -o "$enable_tclinterp" = "dynamic"; then
 	    dnl "-D_ABC" items.  Watch out for -DFOO=long\ long.
 	    TCL_DEFS=`echo $TCL_DEFS | sed -e 's/\\\\ /\\\\X/g' | tr ' ' '\012' | sed -e '/^[[^-]]/d' -e '/^-[[^D]]/d' -e '/-D[[^_]]/d' -e 's/-D_/ -D_/' | tr '\012' ' ' | sed -e 's/\\\\X/\\\\ /g'`
 	    break
+          else
+            if test "x$MACOS_X" = "xyes"; then
+              TCL_LIBS="-framework Tcl"
+            fi
 	  fi
 	done
 	if test -z "$TCL_LIBS"; then