From f0dd7b62964df89eb3cd50678f9a8ef98392be1d Mon Sep 17 00:00:00 2001
From: "Curtis.Bezault" <curtbezault@gmail.com>
Date: Fri, 9 Aug 2019 14:51:16 -0700
Subject: fix missing abi key mistake

---
 toolsrc/src/vcpkg/build.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/toolsrc/src/vcpkg/build.cpp b/toolsrc/src/vcpkg/build.cpp
index 7e14a0926..385013b9b 100644
--- a/toolsrc/src/vcpkg/build.cpp
+++ b/toolsrc/src/vcpkg/build.cpp
@@ -1120,7 +1120,8 @@ namespace vcpkg::Build
                         pre_build_info.passthrough_env_vars = Strings::split(variable_value, ";");
                         break;
                     case VcpkgTripletVar::PUBLIC_ABI_OVERRIDE :
-                        pre_build_info.public_abi_override = variable_value;
+                        pre_build_info.public_abi_override =
+                            variable_value.empty() ? nullopt : Optional<std::string>{variable_value};
                         break;
                 }
             }
-- 
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