CMake Warning: Manually-specified variables were not used by the project: CMAKE_EXPORT_NO_PACKAGE_REGISTRY CMAKE_INSTALL_BINDIR CMAKE_INSTALL_DATAROOTDIR CMAKE_INSTALL_INCLUDEDIR CMAKE_INSTALL_LIBDIR CMAKE_INSTALL_LIBEXECDIR CMAKE_INSTALL_OLDINCLUDEDIR CMAKE_INSTALL_SBINDIR /home/conan/w/cci_PR-3705/.conan/data/mbedtls/2.24.0/_/_/build/0c7c53c55d4be916c8e8f24f1c6508da5f10eea5/source_subfolder/library/ssl_msg.c: In function 'mbedtls_ssl_cf_memcpy_if_eq': /home/conan/w/cci_PR-3705/.conan/data/mbedtls/2.24.0/_/_/build/0c7c53c55d4be916c8e8f24f1c6508da5f10eea5/source_subfolder/library/ssl_msg.c:1085:5: error: 'for' loop initial declarations are only allowed in C99 or C11 mode for( size_t i = 0; i < len; i++ ) ^ /home/conan/w/cci_PR-3705/.conan/data/mbedtls/2.24.0/_/_/build/0c7c53c55d4be916c8e8f24f1c6508da5f10eea5/source_subfolder/library/ssl_msg.c:1085:5: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code make[2]: *** [source_subfolder/library/CMakeFiles/mbedtls.dir/ssl_msg.c.o] Error 1 make[2]: *** Waiting for unfinished jobs.... make[1]: *** [source_subfolder/library/CMakeFiles/mbedtls.dir/all] Error 2 make: *** [all] Error 2 mbedtls/2.24.0: WARN: Build folder is dirty, removing it: /home/conan/w/cci_PR-3705/.conan/data/mbedtls/2.24.0/_/_/build/0c7c53c55d4be916c8e8f24f1c6508da5f10eea5 mbedtls/2.24.0: ERROR: Package '0c7c53c55d4be916c8e8f24f1c6508da5f10eea5' build failed mbedtls/2.24.0: WARN: Build folder /home/conan/w/cci_PR-3705/.conan/data/mbedtls/2.24.0/_/_/build/0c7c53c55d4be916c8e8f24f1c6508da5f10eea5 ERROR: mbedtls/2.24.0: Error in build() method, line 81 cmake.build() ConanException: Error 2 while executing cmake --build '/home/conan/w/cci_PR-3705/.conan/data/mbedtls/2.24.0/_/_/build/0c7c53c55d4be916c8e8f24f1c6508da5f10eea5' '--' '-j3'