Linker Error: Symbol(s) already defined in cpprest_2_10d.lib

[brentarias]

I'm working with a git repo having a Visual Studio 2017 solution which builds successfully for everyone on my team...except for me. From a couple of my own C++ projects, I have almost two dozen LNK2005 linker errors referencing cpprest_2_10.lib like this one:

Error:
LNK2005 "public: __thiscall web::json::value::value(class web::json::value const &)" (??0value@json@web@@QAE@ABV012@@z) already defined in cpprest_2_10d.lib(cpprest_2_10d.dll)
File:
C:\repos\spirion\SearchAgent2\SdmScanner\cpprestsdk140.lib(json.obj)

I am intentionally using CppRestSDK, and yet I have no idea why there is reference specifically to this cpprest_2_10d.lib. When I build CppRestSDK, no such library is created. Instead the CppRestSDK build gives me a library called cpprestsdk140.lib.

My best guess of why I'm having a problem...is that I might be the only engineer who installed vcpkg and obtained the CppRestSDK through vcpkg. But here is the thing...I used vcpkg in the context of a stand-alone C++ console app that has no relationship to the main repo/solution I'm working on with my team. I would expect that there is zero "bleed" between these visual studio solutions. The solution that has the linker errors has no relation to vcpkg; instead it simply has a full copy of the CppRestSDK source code and builds from scratch. It builds its copy of CppRestSDK without any issues.

Any idea of how or why this is happening?