Centos7, vcpkg, cmake: can't find header files

[RotateAt60MPH]

I should call this YACFF: yet another can't find files. :)

I'm trying to get a cmake (3.19.7) build project working under CentOS7 to build a library 'Common'. I've installed boost and cpprestsdk packages under vcpkg, but I cannot get the build to find cpprestsdk header files.

Here's my CMakeList.txt:

cmake_minimum_required(VERSION 3.15-3.19)

set(CMAKE_VERBOSE_MAKEFILE ON)
project(Common)

message(STATUS "** Building ${PROJECT_NAME} **")

file(GLOB SOURCES "*.cpp")
file(GLOB HEADERS "*.h")

find_package(cpprestsdk CONFIG REQUIRED)

add_library(${PROJECT_NAME} ${SOURCES} ${HEADERS})
target_precompile_headers(${PROJECT_NAME} PUBLIC stdafx.h)

# PUBLIC needed to make library available elsewhere in project
target_include_directories(${PROJECT_NAME}
    PUBLIC ${PROJECT_SOURCE_DIR}/..)

if(CMAKE_BUILD_TYPE_INIT STREQUAL "Debug")
  set_target_properties(${PROJECT_NAME} PROPERTIES OUTPUT_NAME "CommonD")
endif()

# Tell compiler to use C++20 features. The code doesn't actually use any of them.
target_compile_features(${PROJECT_NAME} PUBLIC cxx_std_11)

My cmake and make CLI steps are:

everest /home/Devel/Cores/generator/lib/Common $ cmake \
  -DCMAKE_TOOLCHAIN_FILE=/home/Devel/vcpkg/scripts/buildsystems/vcpkg.cmake \
  -DCMAKE_PREFIX_PATH=/home/Devel/vcpkg/installed/x64-linux/share/cpprestsdk .
...

everest /home/Devel/Cores/generator/lib/Common $ make all
/usr/local/bin/cmake -S/home/Devel/Cores/generator/lib/Common -B/home/Devel/Cores/generator/lib/Common --check-build-system CMakeFiles/Makefile.cmake 0
/usr/local/bin/cmake -E cmake_progress_start /home/Devel/Cores/generator/lib/Common/CMakeFiles /home/Devel/Cores/generator/lib/Common//CMakeFiles/progress.marks
make  -f CMakeFiles/Makefile2 all
make[1]: Entering directory '/home/Devel/Cores/generator/lib/Common'
make  -f CMakeFiles/Common.dir/build.make CMakeFiles/Common.dir/depend
make[2]: Entering directory '/home/Devel/Cores/generator/lib/Common'
cd /home/Devel/Cores/generator/lib/Common && /usr/local/bin/cmake -E cmake_depends "Unix Makefiles" /home/Devel/Cores/generator/lib/Common /home/Devel/Cores/generator/lib/Common /home/Devel/Cores/generator/lib/Common /home/Devel/Cores/generator/lib/Common /home/Devel/Cores/generator/lib/Common/CMakeFiles/Common.dir/DependInfo.cmake --color=
make[2]: Leaving directory '/home/Devel/Cores/generator/lib/Common'
make  -f CMakeFiles/Common.dir/build.make CMakeFiles/Common.dir/build
make[2]: Entering directory '/home/Devel/Cores/generator/lib/Common'
[  7%] Building CXX object CMakeFiles/Common.dir/cmake_pch.hxx.gch
/opt/rh/devtoolset-7/root/usr/bin/c++  -I/home/Devel/Cores/generator/lib/Common/..  -Winvalid-pch -x c++-header -include /home/Devel/Cores/generator/lib/Common/CMakeFiles/Common.dir/cmake_pch.hxx -o CMakeFiles/Common.dir/cmake_pch.hxx.gch -c /home/Devel/Cores/generator/lib/Common/CMakeFiles/Common.dir/cmake_pch.hxx.cxx
In file included from /home/Devel/Cores/generator/lib/Common/stdafx.h:4:0,
                 from /home/Devel/Cores/generator/lib/Common/CMakeFiles/Common.dir/cmake_pch.hxx:5,
                 from <command-line>:0:
/home/Devel/Cores/generator/lib/Common/Common.h:49:10: fatal error: cpprest/json.h: No such file or directory
 #include <cpprest/json.h>
          ^~~~~~~~~~~~~~~~
compilation terminated.
make[2]: *** [CMakeFiles/Common.dir/build.make:86: CMakeFiles/Common.dir/cmake_pch.hxx.gch] Error 1
make[2]: Leaving directory '/home/Devel/Cores/generator/lib/Common'
make[1]: *** [CMakeFiles/Makefile2:98: CMakeFiles/Common.dir/all] Error 2
make[1]: Leaving directory '/home/Devel/Cores/generator/lib/Common'
make: *** [Makefile:106: all] Error 2

It should be able to find the needed .cpprestsdk-config.cmake file, I believe

everest /home/Devel/vcpkg/installed/x64-linux/share/cpprestsdk (master)$ ls -l
total 32
-rw-r--r-- 1 1120 Mar 30 18:24 copyright
-rw-r--r-- 1 486 Mar 30 18:24 cpprestsdk-config.cmake
-rw-r--r-- 1 431 Mar 30 18:24 cpprestsdk-config-version.cmake
-rw-r--r-- 1 4536 Mar 30 18:24 cpprestsdk-targets.cmake
-rw-rw-r-- 1 860 Mar 30 18:24 cpprestsdk-targets-debug.cmake
-rw-r--r-- 1 858 Mar 30 18:24 cpprestsdk-targets-release.cmake
-rw-rw-r-- 1 1472 Mar 30 18:24 vcpkg_abi_info.txt

Any advice appreciated.