Following error was observed:

crash-reporter-0.0.1-r2786: ../../../../../../../tmp/portage/chromeos-base/crash-reporter-0.0.1-r2786/work/crash-reporter-0.0.1/crash-reporter/chrome_collector.cc:173:3: error: unknown type name 'string'; did you mean 'pcrecpp::string'?
crash-reporter-0.0.1-r2786:   string pid_data;
crash-reporter-0.0.1-r2786:   ^~~~~~
crash-reporter-0.0.1-r2786:   pcrecpp::string
crash-reporter-0.0.1-r2786: ../../../../../../../usr/include/pcre_stringpiece.h:59:12: note: 'pcrecpp::string' declared here
crash-reporter-0.0.1-r2786: using std::string;
crash-reporter-0.0.1-r2786:            ^
crash-reporter-0.0.1-r2786: 1 error generated.