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-rw-r--r--pkgs/tools/networking/nfstrace/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/tools/networking/nfstrace/default.nix b/pkgs/tools/networking/nfstrace/default.nix
index 7e2b938e4c8b8..297ada3cc2aad 100644
--- a/pkgs/tools/networking/nfstrace/default.nix
+++ b/pkgs/tools/networking/nfstrace/default.nix
@@ -45,7 +45,7 @@ stdenv.mkDerivation rec {
   # To build with GCC 8+ it needs:
   CXXFLAGS = "-Wno-class-memaccess -Wno-ignored-qualifiers";
   # CMake can't find json_c without:
-  NIX_CFLAGS_COMPILE = [ "-I${json_c.dev}/include/json-c" "-Wno-error=address-of-packed-member" "-I${libtirpc.dev}/include/tirpc" ];
+  env.NIX_CFLAGS_COMPILE = toString [ "-I${json_c.dev}/include/json-c" "-Wno-error=address-of-packed-member" "-I${libtirpc.dev}/include/tirpc" ];
   NIX_LDFLAGS = [ "-ltirpc" ];
 
   doCheck = false; # requires network access