--- a/configure
+++ b/configure
@@ -99,6 +99,7 @@
 # alphabetically by architecture, generic-gnu last.
 all_platforms="${all_platforms} arm64-android-gcc"
 all_platforms="${all_platforms} arm64-darwin-gcc"
+all_platforms="${all_platforms} arm64-darwin20-gcc"
 all_platforms="${all_platforms} arm64-linux-gcc"
 all_platforms="${all_platforms} arm64-win64-gcc"
 all_platforms="${all_platforms} arm64-win64-vs15"
@@ -150,6 +151,7 @@
 all_platforms="${all_platforms} x86_64-darwin17-gcc"
 all_platforms="${all_platforms} x86_64-darwin18-gcc"
 all_platforms="${all_platforms} x86_64-darwin19-gcc"
+all_platforms="${all_platforms} x86_64-darwin20-gcc"
 all_platforms="${all_platforms} x86_64-iphonesimulator-gcc"
 all_platforms="${all_platforms} x86_64-linux-gcc"
 all_platforms="${all_platforms} x86_64-linux-icc"
--- a/build/make/configure.sh
+++ b/build/make/configure.sh
@@ -771,6 +771,10 @@
         tgt_isa=x86_64
         tgt_os=`echo $gcctarget | sed 's/.*\(darwin1[0-9]\).*/\1/'`
         ;;
+      *darwin20*)
+        tgt_isa=`uname -m`
+        tgt_os=`echo $gcctarget | sed 's/.*\(darwin2[0-9]\).*/\1/'`
+        ;;
       x86_64*mingw32*)
         tgt_os=win64
         ;;
@@ -842,86 +846,6 @@
     IOS_VERSION_MIN="7.0"
   fi
 
-  # Handle darwin variants. Newer SDKs allow targeting older
-  # platforms, so use the newest one available.
-  case ${toolchain} in
-    arm*-darwin*)
-      add_cflags "-miphoneos-version-min=${IOS_VERSION_MIN}"
-      iphoneos_sdk_dir="$(show_darwin_sdk_path iphoneos)"
-      if [ -d "${iphoneos_sdk_dir}" ]; then
-        add_cflags  "-isysroot ${iphoneos_sdk_dir}"
-        add_ldflags "-isysroot ${iphoneos_sdk_dir}"
-      fi
-      ;;
-    x86*-darwin*)
-      osx_sdk_dir="$(show_darwin_sdk_path macosx)"
-      if [ -d "${osx_sdk_dir}" ]; then
-        add_cflags  "-isysroot ${osx_sdk_dir}"
-        add_ldflags "-isysroot ${osx_sdk_dir}"
-      fi
-      ;;
-  esac
-
-  case ${toolchain} in
-    *-darwin8-*)
-      add_cflags  "-mmacosx-version-min=10.4"
-      add_ldflags "-mmacosx-version-min=10.4"
-      ;;
-    *-darwin9-*)
-      add_cflags  "-mmacosx-version-min=10.5"
-      add_ldflags "-mmacosx-version-min=10.5"
-      ;;
-    *-darwin10-*)
-      add_cflags  "-mmacosx-version-min=10.6"
-      add_ldflags "-mmacosx-version-min=10.6"
-      ;;
-    *-darwin11-*)
-      add_cflags  "-mmacosx-version-min=10.7"
-      add_ldflags "-mmacosx-version-min=10.7"
-      ;;
-    *-darwin12-*)
-      add_cflags  "-mmacosx-version-min=10.8"
-      add_ldflags "-mmacosx-version-min=10.8"
-      ;;
-    *-darwin13-*)
-      add_cflags  "-mmacosx-version-min=10.9"
-      add_ldflags "-mmacosx-version-min=10.9"
-      ;;
-    *-darwin14-*)
-      add_cflags  "-mmacosx-version-min=10.10"
-      add_ldflags "-mmacosx-version-min=10.10"
-      ;;
-    *-darwin15-*)
-      add_cflags  "-mmacosx-version-min=10.11"
-      add_ldflags "-mmacosx-version-min=10.11"
-      ;;
-    *-darwin16-*)
-      add_cflags  "-mmacosx-version-min=10.12"
-      add_ldflags "-mmacosx-version-min=10.12"
-      ;;
-    *-darwin17-*)
-      add_cflags  "-mmacosx-version-min=10.13"
-      add_ldflags "-mmacosx-version-min=10.13"
-      ;;
-    *-darwin18-*)
-      add_cflags  "-mmacosx-version-min=10.14"
-      add_ldflags "-mmacosx-version-min=10.14"
-      ;;
-    *-darwin19-*)
-      add_cflags  "-mmacosx-version-min=10.15"
-      add_ldflags "-mmacosx-version-min=10.15"
-      ;;
-    *-iphonesimulator-*)
-      add_cflags  "-miphoneos-version-min=${IOS_VERSION_MIN}"
-      add_ldflags "-miphoneos-version-min=${IOS_VERSION_MIN}"
-      iossim_sdk_dir="$(show_darwin_sdk_path iphonesimulator)"
-      if [ -d "${iossim_sdk_dir}" ]; then
-        add_cflags  "-isysroot ${iossim_sdk_dir}"
-        add_ldflags "-isysroot ${iossim_sdk_dir}"
-      fi
-      ;;
-  esac
-
   # Handle Solaris variants. Solaris 10 needs -lposix4
   case ${toolchain} in
     sparc-solaris-*)
@@ -1084,7 +1008,7 @@
           soft_enable unit_tests
           ;;
 
-        darwin*)
+        darwin)
           if ! enabled external_build; then
             XCRUN_FIND="xcrun --sdk iphoneos --find"
             CXX="$(${XCRUN_FIND} clang++)"