Boostless GTSAM built requires Boost as dependency

[laxnpander]

Description

I built GTSAM without boost, yet linking it in my application leads to CMake looking for Boost. This is the CMake error:

CMake Error at C:/Program Files/CMake/share/cmake-3.30/Modules/FindPackageHandleStandardArgs.cmake:233 (message):
  Could NOT find Boost (missing: Boost_INCLUDE_DIR)

This is the GTSAMConfig.cmake:

# - Config file for GTSAM
# It defines the following variables
#  GTSAM_INCLUDE_DIR - include directories for GTSAM

# Compute paths
get_filename_component(OUR_CMAKE_DIR "${CMAKE_CURRENT_LIST_FILE}" PATH)
if(EXISTS "${OUR_CMAKE_DIR}/CMakeCache.txt")
  # In build tree
  set(GTSAM_INCLUDE_DIR C:/Users/cipadmin/Documents/Workspace/spear/3rd/gtsam CACHE PATH "GTSAM include directory")
else()
  # Find installed library
  set(GTSAM_INCLUDE_DIR "${OUR_CMAKE_DIR}/../include" CACHE PATH "GTSAM include directory")
endif()

# Find dependencies, required by cmake exported targets:
include(CMakeFindDependencyMacro)
# Allow using cmake < 3.8
if(${CMAKE_VERSION} VERSION_LESS "3.8.0")
find_package(Boost  COMPONENTS )
else()
find_dependency(Boost  COMPONENTS )
endif()

if(0)
    find_dependency(TBB 4.4 COMPONENTS tbb tbbmalloc)
endif()

if(OFF)
find_dependency(Eigen3 REQUIRED)
endif()

# Load exports
include(${OUR_CMAKE_DIR}/GTSAM-exports.cmake)

# Load project-specific flags, if present
if(EXISTS "${OUR_CMAKE_DIR}/gtsam_extra.cmake")
	include("${OUR_CMAKE_DIR}/gtsam_extra.cmake")
endif()

message(STATUS "GTSAM include directory:  ${GTSAM_INCLUDE_DIR}")

Steps to reproduce

1. Build GTSAM with the following commands:

cmake .. -DGTSAM_USE_BOOST_FEATURES=OFF -DGTSAM_ENABLE_BOOST_SERIALIZATION=OFF -DCMAKE_INSTALL_PREFIX=../cmake-install/ -DCMAKE_BUILD_TYPE=Release  -DGTSAM_BUILD_UNSTABLE=OFF -DGTSAM_BUILD_PYTHON=OFF

2. Link GTSAM in another CMake project

Expected behavior

It should not link to Boost if it is built without Boost.

Environment

Windows 10

Additional information

[ProfFan]

Ah yes, there should be a conditional in the config file...