utf8.h includes umachine.h umachine.h detects _WIN64 definition and includes pwin32.h pwin32.h defines U_EXPORT to __declspec(dllexport) ...later U_INTERNAL includes U_EXPORT in its definition
so eventually it errors out:
gcc -c -I. -I. -I../../include -I../../include -I/usr/include/freetype2 -D__WINESRC__ -D_GDI32_ -D_REENTRANT -fPIC -Wall -pipe -fno-strict-aliasing -gstabs+ -Wdeclaration-after-statement -Wwrite-strings -Wpointer-arith -g -O2 -D_WIN64 -o bidi.o bidi.c In file included from /usr/include/unicode/utf.h:222, from /usr/include/unicode/utypes.h:38, from /usr/include/unicode/ubidi.h:21, from bidi.c:27: /usr/include/unicode/utf8.h: In function ‘__declspec’: /usr/include/unicode/utf8.h:75: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘UChar32’ /usr/include/unicode/utf8.h:82: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘int32_t’ ...