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On Linux with gcc 4.8.4 I had to change -ansi to -std=gnu99 in the Makefile to get...
gcc -O3 -Wall -ansi -pedantic -Wno-long-long -pthread -flto -msse -DNDEBUG -c co...
I think in line 280 of xboard.c pieceSymbol[pieceIndex] should be tolower(pieceSymbol[pieceIndex])....