CMake error from recent source

[Huppy]

Just tried to compile the most recent source (from GIT), hadn't done it in several months.
I got the error (below) when trying to configure in cmake. I reverted back to my older source
and didn't get any grief. Not sure sure what the Zlib error is about. I know I do still have zlib
installed on my puter (c:\zlib), been there for a few years. Line 305 in CMakeLists is,
FIND_PACKAGE(ZLIB REQUIRED)

The C compiler identification is MSVC 18.0.31101.0
The CXX compiler identification is MSVC 18.0.31101.0
Check for working C compiler using: Visual Studio 12 2013
Check for working C compiler using: Visual Studio 12 2013 -- works
Detecting C compiler ABI info
Detecting C compiler ABI info - done
Check for working CXX compiler using: Visual Studio 12 2013
Check for working CXX compiler using: Visual Studio 12 2013 -- works
Detecting CXX compiler ABI info
Detecting CXX compiler ABI info - done
Detecting CXX compile features
Detecting CXX compile features - done
CMake Error at C:/Program Files (x86)/CMake/share/cmake-3.2/Modules/FindPackageHandleStandardArgs.cmake:138 (message):
  Could NOT find ZLIB (missing: ZLIB_LIBRARY ZLIB_INCLUDE_DIR)
Call Stack (most recent call first):
  C:/Program Files (x86)/CMake/share/cmake-3.2/Modules/FindPackageHandleStandardArgs.cmake:374 (_FPHSA_FAILURE_MESSAGE)
  C:/Program Files (x86)/CMake/share/cmake-3.2/Modules/FindZLIB.cmake:110 (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
  CMakeLists.txt:305 (FIND_PACKAGE)

Configuring incomplete, errors occurred!