CMake Error at source_subfolder/CMakeLists.txt:417 (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:417 (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/2019.10.21.00 to openssl/1.1.1h boost/1.74.0: WARN: Picked up a system libbacktrace library folly/2019.10.21.00: WARN: Build folder is dirty, removing it: /home/conan/w/cci_PR-4048/.conan/data/folly/2019.10.21.00/_/_/build/2d14fa2c351ba253ddc8a3cb2f0bdabf0de3c31a folly/2019.10.21.00: ERROR: Package '2d14fa2c351ba253ddc8a3cb2f0bdabf0de3c31a' build failed folly/2019.10.21.00: WARN: Build folder /home/conan/w/cci_PR-4048/.conan/data/folly/2019.10.21.00/_/_/build/2d14fa2c351ba253ddc8a3cb2f0bdabf0de3c31a ERROR: folly/2019.10.21.00: Error in build() method, line 134 cmake = self._configure_cmake() while calling '_configure_cmake', line 127 self._cmake.configure() ConanException: Error 1 while executing cd '/home/conan/w/cci_PR-4048/.conan/data/folly/2019.10.21.00/_/_/build/2d14fa2c351ba253ddc8a3cb2f0bdabf0de3c31a' && cmake -G "Unix Makefiles" -DCMAKE_BUILD_TYPE="Release" -DCONAN_IN_LOCAL_CACHE="ON" -DCONAN_COMPILER="gcc" -DCONAN_COMPILER_VERSION="7" -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/2019.10.21.00/_/_/package/2d14fa2c351ba253ddc8a3cb2f0bdabf0de3c31a" -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/2019.10.21.00/_/_/build/2d14fa2c351ba253ddc8a3cb2f0bdabf0de3c31a" -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/2019.10.21.00/_/_/build/2d14fa2c351ba253ddc8a3cb2f0bdabf0de3c31a'