Could NOT find ZLIB (missing: ZLIB_INCLUDE_DIR)

[itksnapq...@gmail.com]

How do I solve this error?

Attached is my config. Using ITK Snap 2.1.4

Selecting Windows SDK version 10.0.16299.0 to target Windows 6.1.7601.

FLTK base: C:\APROJ\obj\fltk

FLTK lib dir: C:/APROJ/obj

FLTK target: fltkforms

FLTK include directory: C:\APROJ\obj\fltk\lib\Release

Could NOT find ZLIB (missing: ZLIB_INCLUDE_DIR)

CMake Error at C:/Program Files/CMake/share/cmake-3.10/Modules/FindPackageHandleStandardArgs.cmake:137 (message):
Could NOT find ZLIB (missing: ZLIB_INCLUDE_DIR)
Call Stack (most recent call first):
C:/Program Files/CMake/share/cmake-3.10/Modules/FindPackageHandleStandardArgs.cmake:378 (_FPHSA_FAILURE_MESSAGE)
C:/Program Files/CMake/share/cmake-3.10/Modules/FindZLIB.cmake:112 (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
CMake/find_fltk_13.cmake:102 (FIND_PACKAGE)
CMake/standalone.cmake:16 (INCLUDE)
CMakeLists.txt:76 (INCLUDE)

Configuring incomplete, errors occurred!

See also "C:/APROJ/obj/itkSnap_amc/CMakeFiles/CMakeOutput.log".