src/gui/dialogs/campaign_difficulty.cpp:65:1: error: prototype for ‘gui2::tcampaign_difficulty::tcampaign_difficulty(const std::vector<std::basic_string<char> >&)’ does not match any in class ‘gui2::tcampaign_difficulty’
src/gui/dialogs/campaign_difficulty.hpp:26:7: error: candidates are: gui2::tcampaign_difficulty::tcampaign_difficulty(const gui2::tcampaign_difficulty&)
src/gui/dialogs/campaign_difficulty.hpp:29:11: error:                 gui2::tcampaign_difficulty::tcampaign_difficulty(const std::vector<std::basic_string<char> >&, int)
scons: *** [build/release/gui/dialogs/campaign_difficulty.o] Error 1
scons: building terminated because of errors.