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-rw-r--r--nixpkgs/pkgs/development/libraries/languagemachines/libfolia.nix3
1 files changed, 3 insertions, 0 deletions
diff --git a/nixpkgs/pkgs/development/libraries/languagemachines/libfolia.nix b/nixpkgs/pkgs/development/libraries/languagemachines/libfolia.nix
index 395591be55be..a00c3be4193e 100644
--- a/nixpkgs/pkgs/development/libraries/languagemachines/libfolia.nix
+++ b/nixpkgs/pkgs/development/libraries/languagemachines/libfolia.nix
@@ -16,6 +16,9 @@ stdenv.mkDerivation {
   buildInputs = [ automake autoconf bzip2 libtool autoconf-archive libtar libxml2 icu languageMachines.ticcutils ];
   preConfigure = "sh bootstrap.sh";
 
+  # compat with icu61+ https://github.com/unicode-org/icu/blob/release-64-2/icu4c/readme.html#L554
+  CXXFLAGS = [ "-DU_USING_ICU_NAMESPACE=1" ];
+
   meta = with stdenv.lib; {
     description = "A C++ API for FoLiA documents; an XML-based linguistic annotation format.";
     homepage    = https://proycon.github.io/folia/;