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-rw-r--r--pkgs/development/tools/misc/openocd/default.nix4
1 files changed, 2 insertions, 2 deletions
diff --git a/pkgs/development/tools/misc/openocd/default.nix b/pkgs/development/tools/misc/openocd/default.nix
index eea27b3e51f..88f75a3081b 100644
--- a/pkgs/development/tools/misc/openocd/default.nix
+++ b/pkgs/development/tools/misc/openocd/default.nix
@@ -25,13 +25,13 @@ stdenv.mkDerivation rec {
     "--enable-remote-bitbang"
   ];
 
-  NIX_CFLAGS_COMPILE = lib.optionals stdenv.cc.isGNU [
+  NIX_CFLAGS_COMPILE = toString (lib.optionals stdenv.cc.isGNU [
     "-Wno-implicit-fallthrough"
     "-Wno-format-truncation"
     "-Wno-format-overflow"
     "-Wno-error=tautological-compare"
     "-Wno-error=array-bounds"
-  ];
+  ]);
 
   postInstall = lib.optionalString stdenv.isLinux ''
     mkdir -p "$out/etc/udev/rules.d"