diff --git a/devel/electron12/files/patch-third__party_zlib_BUILD.gn b/devel/electron12/files/patch-third__party_zlib_BUILD.gn
new file mode 100644
index 000000000000..822486e2ff69
--- /dev/null
+++ b/devel/electron12/files/patch-third__party_zlib_BUILD.gn
@@ -0,0 +1,11 @@
+--- third_party/zlib/BUILD.gn.orig	2021-04-13 08:26:04 UTC
++++ third_party/zlib/BUILD.gn
+@@ -108,6 +108,8 @@ if (use_arm_neon_optimizations) {
+       defines = [ "CRC32_ARMV8_CRC32" ]
+       if (is_android) {
+         defines += [ "ARMV8_OS_ANDROID" ]
++      } else if (is_bsd) {
++        defines += [ "ARMV8_OS_FREEBSD" ]
+       } else if (is_linux || is_chromeos) {
+         defines += [ "ARMV8_OS_LINUX" ]
+       } else if (is_mac) {