...
  Flow control statements are not properly nested.
Call Stack (most recent call first):
  CMakeLists.txt:427 (INCLUDE)
-- Configuring incomplete, errors occurred!
See also "/var/tmp/portage/dev-db/mariadb-connector-c-3.1.10/work/mariadb-connector-c-3.1.10-src-abi_x86_64.amd64/CMakeFiles/CMakeOutput.log".
See also "/var/tmp/portage/dev-db/mariadb-connector-c-3.1.10/work/mariadb-connector-c-3.1.10-src-abi_x86_64.amd64/CMakeFiles/CMakeError.log".
 * ERROR: dev-db/mariadb-connector-c-3.1.10::dev-kit failed (configure phase):
 *   cmake failed
 * 
 * Call stack:
 *     ebuild.sh, line   93:  Called src_configure
 *   environment, line 3329:  Called multilib-minimal_src_configure
 *   environment, line 2489:  Called multilib_foreach_abi 'multilib-minimal_abi_src_configure'
 *   environment, line 2742:  Called multibuild_foreach_variant '_multilib_multibuild_wrapper' 'multilib-minimal_abi_src_configure'
 *   environment, line 2419:  Called _multibuild_run '_multilib_multibuild_wrapper' 'multilib-minimal_abi_src_configure'
 *   environment, line 2417:  Called _multilib_multibuild_wrapper 'multilib-minimal_abi_src_configure'
 *   environment, line  584:  Called multilib-minimal_abi_src_configure
 *   environment, line 2483:  Called multilib_src_configure
 *   environment, line 2967:  Called cmake-utils_src_configure
 *   environment, line  881:  Called die
 * The specific snippet of code:
 *       "${CMAKE_BINARY}" "${cmakeargs[@]}" "${CMAKE_USE_DIR}" || die "cmake failed";
...