CMake Error at source_subfolder/CMakeLists.txt:445 (file): Error evaluating generator expression: $ $ may only be used with binary targets to specify include directories, compile definitions, and compile options. It may not be used with the add_custom_command, add_custom_target, or file(GENERATE) commands. CMake Error at source_subfolder/CMakeLists.txt:445 (file): Error evaluating generator expression: $ $ may only be used with binary targets to specify include directories, compile definitions, and compile options. It may not be used with the add_custom_command, add_custom_target, or file(GENERATE) commands. CMake Warning: Manually-specified variables were not used by the project: CMAKE_EXPORT_NO_PACKAGE_REGISTRY CMake Generate step failed. Build files cannot be regenerated correctly. WARN: libevent/2.1.12: requirement openssl/1.1.1g overridden by folly/2020.08.10.00 to openssl/1.1.1i boost/1.74.0: WARN: Picked up a system libbacktrace library folly/2020.08.10.00: WARN: Build folder is dirty, removing it: /home/conan/w/cci_PR-4048/.conan/data/folly/2020.08.10.00/_/_/build/0f4a0aed497dd68bc291f2139f092de40ffb4fda folly/2020.08.10.00: ERROR: Package '0f4a0aed497dd68bc291f2139f092de40ffb4fda' build failed folly/2020.08.10.00: WARN: Build folder /home/conan/w/cci_PR-4048/.conan/data/folly/2020.08.10.00/_/_/build/0f4a0aed497dd68bc291f2139f092de40ffb4fda ERROR: folly/2020.08.10.00: Error in build() method, line 140 cmake = self._configure_cmake() while calling '_configure_cmake', line 133 self._cmake.configure() ConanException: Error 1 while executing cd '/home/conan/w/cci_PR-4048/.conan/data/folly/2020.08.10.00/_/_/build/0f4a0aed497dd68bc291f2139f092de40ffb4fda' && cmake -G "Unix Makefiles" -DCMAKE_BUILD_TYPE="Release" -DCONAN_IN_LOCAL_CACHE="ON" -DCONAN_COMPILER="gcc" -DCONAN_COMPILER_VERSION="5" -DCONAN_CXX_FLAGS="-m64" -DCONAN_SHARED_LINKER_FLAGS="-m64" -DCONAN_C_FLAGS="-m64" -DCONAN_LIBCXX="libstdc++" -DBUILD_SHARED_LIBS="OFF" -DCMAKE_INSTALL_PREFIX="/home/conan/w/cci_PR-4048/.conan/data/folly/2020.08.10.00/_/_/package/0f4a0aed497dd68bc291f2139f092de40ffb4fda" -DCMAKE_INSTALL_BINDIR="bin" -DCMAKE_INSTALL_SBINDIR="bin" -DCMAKE_INSTALL_LIBEXECDIR="bin" -DCMAKE_INSTALL_LIBDIR="lib" -DCMAKE_INSTALL_INCLUDEDIR="include" -DCMAKE_INSTALL_OLDINCLUDEDIR="include" -DCMAKE_INSTALL_DATAROOTDIR="share" -DCONAN_CMAKE_POSITION_INDEPENDENT_CODE="ON" -DCMAKE_MODULE_PATH="/home/conan/w/cci_PR-4048/.conan/data/folly/2020.08.10.00/_/_/build/0f4a0aed497dd68bc291f2139f092de40ffb4fda" -DCMAKE_EXPORT_NO_PACKAGE_REGISTRY="ON" -DCONAN_EXPORTED="1" -DCMAKE_POSITION_INDEPENDENT_CODE="True" -DCXX_STD="c++14" -Wno-dev '/home/conan/w/cci_PR-4048/.conan/data/folly/2020.08.10.00/_/_/build/0f4a0aed497dd68bc291f2139f092de40ffb4fda'