6 files changed, 7 insertions, 6 deletions
diff --git a/pkgs/tools/graphics/appleseed/default.nix b/pkgs/tools/graphics/appleseed/default.nix
index d45c28528e7..cafe0bb7b11 100644
--- a/pkgs/tools/graphics/appleseed/default.nix
+++ b/pkgs/tools/graphics/appleseed/default.nix
@@ -24,7 +24,7 @@ in stdenv.mkDerivation rec {
     osl seexpr makeWrapper
   ];
 
-  NIX_CFLAGS_COMPILE = [
+  NIX_CFLAGS_COMPILE = toString [
     "-I${openexr.dev}/include/OpenEXR"
     "-I${ilmbase.dev}/include/OpenEXR"
     "-I${openimageio.dev}/include/OpenImageIO"
diff --git a/pkgs/tools/graphics/asymptote/default.nix b/pkgs/tools/graphics/asymptote/default.nix
index 14b15686d72..31bdba26783 100644
--- a/pkgs/tools/graphics/asymptote/default.nix
+++ b/pkgs/tools/graphics/asymptote/default.nix
@@ -54,7 +54,7 @@ stdenv.mkDerivation rec {
     "--with-context=$out/share/texmf/tex/context/third"
   ];
 
-  NIX_CFLAGS_COMPILE = [ "-I${boehmgc.dev}/include/gc" ];
+  NIX_CFLAGS_COMPILE = "-I${boehmgc.dev}/include/gc";
 
   postInstall = ''
     mv $out/share/info/asymptote/*.info $out/share/info/
diff --git a/pkgs/tools/graphics/zbar/default.nix b/pkgs/tools/graphics/zbar/default.nix
index 9a071e6150f..7610b4e56fb 100644
--- a/pkgs/tools/graphics/zbar/default.nix
+++ b/pkgs/tools/graphics/zbar/default.nix
@@ -53,7 +53,7 @@ stdenv.mkDerivation rec {
   ];
 
   # Disable assertions which include -dev QtBase file paths.
-  NIX_CFLAGS_COMPILE = [ "-DQT_NO_DEBUG" ];
+  NIX_CFLAGS_COMPILE = "-DQT_NO_DEBUG";
 
   configureFlags = [
     "--without-python"
diff --git a/pkgs/tools/networking/altermime/default.nix b/pkgs/tools/networking/altermime/default.nix
index e9091086ed9..b1481b2208c 100644
--- a/pkgs/tools/networking/altermime/default.nix
+++ b/pkgs/tools/networking/altermime/default.nix
@@ -10,7 +10,8 @@ stdenv.mkDerivation rec {
     sha256 = "15zxg6spcmd35r6xbidq2fgcg2nzyv1sbbqds08lzll70mqx4pj7";
   };
 
-  NIX_CFLAGS_COMPILE = [ "-Wno-error=format"
+  NIX_CFLAGS_COMPILE = toString [
+    "-Wno-error=format"
     "-Wno-error=format-truncation"
     "-Wno-error=pointer-compare"
     "-Wno-error=memset-elt-size"
diff --git a/pkgs/tools/networking/atinout/default.nix b/pkgs/tools/networking/atinout/default.nix
index 175ba3960ee..16b3ee668da 100644
--- a/pkgs/tools/networking/atinout/default.nix
+++ b/pkgs/tools/networking/atinout/default.nix
@@ -4,7 +4,7 @@ stdenv.mkDerivation rec {
   name = "atinout-${version}";
   version = "0.9.2-alpha";
 
-  NIX_CFLAGS_COMPILE = [ "-Werror=implicit-fallthrough=0" ];
+  NIX_CFLAGS_COMPILE = "-Werror=implicit-fallthrough=0";
   LANG = "C.UTF-8";
   nativeBuildInputs = [ ronn mount ];
 
diff --git a/pkgs/tools/video/mjpegtools/default.nix b/pkgs/tools/video/mjpegtools/default.nix
index 31d26a6c72a..3e72d8b8af5 100644
--- a/pkgs/tools/video/mjpegtools/default.nix
+++ b/pkgs/tools/video/mjpegtools/default.nix
@@ -21,7 +21,7 @@ stdenv.mkDerivation rec {
   buildInputs = [ libdv libjpeg libpng ]
               ++ lib.optionals (!withMinimal) [ gtk2 libX11 SDL SDL_gfx ];
 
-  NIX_CFLAGS_COMPILE = lib.optional (!withMinimal) "-I${SDL.dev}/include/SDL";
+  NIX_CFLAGS_COMPILE = lib.optionalString (!withMinimal) "-I${SDL.dev}/include/SDL";
 
   postPatch = ''
     sed -i -e '/ARCHFLAGS=/s:=.*:=:' configure