diff --git a/pkgs/applications/science/geometry/gama/default.nix b/pkgs/applications/science/geometry/gama/default.nix
index 4d245ad8d152..a27978052a09 100644
--- a/pkgs/applications/science/geometry/gama/default.nix
+++ b/pkgs/applications/science/geometry/gama/default.nix
@@ -12,6 +12,8 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ texinfo zip ];
 
+  env.CXXFLAGS = lib.optionalString stdenv.cc.isClang "-include sstream";
+
   nativeCheckInputs = [ octave libxml2 ];
   doCheck = true;