I'm using gdc on Ubuntu 14.04. Is this ubuntu packaging issue?
bash:~/tmp$ cat test2.d import std.uni, std.stdio; void main() { writeln(normalize("Hello")); } bash:~/tmp$ gdc test2.d /usr/include/d/4.8/std/uni.d:6301: error: undefined identifier tuple /usr/include/d/4.8/std/uni.d:6262: error: template instance std.uni.seekStable!(cast(NormalizationForm)0, char) error instantiating /usr/include/d/4.8/std/uni.d:6087: note: instantiated from here: splitNormalized!(cast(NormalizationForm)0, char) test2.d:4: note: instantiated from here: normalize!(cast(NormalizationForm)0, char) /usr/include/d/4.8/std/uni.d:6271: error: undefined identifier tuple /usr/include/d/4.8/std/uni.d:6087: error: template instance std.uni.splitNormalized!(cast(NormalizationForm)0, char) error instantiating test2.d:4: note: instantiated from here: normalize!(cast(NormalizationForm)0, char) test2.d:4: error: template instance std.uni.normalize!(cast(NormalizationForm)0, char) error instantiating bash:~/tmp$ gdc --version gdc (Ubuntu 4.8.2-19ubuntu1) 4.8.2 Copyright (C) 2013 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.