Created attachment 502494 [details] emerge --info portage/app-emulation/wine-2.3/work/wine-2.3/tools/makedep.c:123:30: error: default initialization of an object of const type 'const struct strarray' without a user-provided default constructor
Created attachment 502496 [details] build log
Can you confirm whether this is occurs with gcc 6.3 and/or gcc 5.4?
Feel free to reopen if you can reproduce this bug with app-emulation/wine-vanilla as well as provide more information as requested.