6 files changed, 8 insertions, 9 deletions
diff --git a/pkgs/tools/graphics/appleseed/default.nix b/pkgs/tools/graphics/appleseed/default.nix
index d45c28528e72..cafe0bb7b11a 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${openimageio.dev}/include/OpenImageIO"
diff --git a/pkgs/tools/graphics/asymptote/default.nix b/pkgs/tools/graphics/asymptote/default.nix
index 14b15686d720..31bdba26783e 100644
--- a/pkgs/tools/graphics/asymptote/default.nix
+++ b/pkgs/tools/graphics/asymptote/default.nix
@@ -54,7 +54,7 @@ stdenv.mkDerivation rec {
     "--with-context=$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/fim/default.nix b/pkgs/tools/graphics/fim/default.nix
index 296ba43a5ed7..3fc82a9c72a0 100644
--- a/pkgs/tools/graphics/fim/default.nix
+++ b/pkgs/tools/graphics/fim/default.nix
@@ -35,7 +35,7 @@ stdenv.mkDerivation rec {
     ++ optional jpegSupport libjpeg
     ++ optional pngSupport libpng;
 
-  NIX_CFLAGS_COMPILE = stdenv.lib.optional x11Support "-lSDL";
+  NIX_CFLAGS_COMPILE = stdenv.lib.optionalString x11Support "-lSDL";
 
   meta = with stdenv.lib; {
     description = "A lightweight, highly customizable and scriptable image viewer";
diff --git a/pkgs/tools/graphics/gifsicle/default.nix b/pkgs/tools/graphics/gifsicle/default.nix
index 79b2708cb2b7..9b3836b9decc 100644
--- a/pkgs/tools/graphics/gifsicle/default.nix
+++ b/pkgs/tools/graphics/gifsicle/default.nix
@@ -11,12 +11,11 @@ stdenv.mkDerivation rec {
     sha256 = "0rffpzxcak19k6cngpxn73khvm3z1gswrqs90ycdzzb53p05ddas";
   };
 
-  buildInputs = optional gifview [ xorgproto libXt libX11 ];
+  buildInputs = optionals gifview [ xorgproto libXt libX11 ];
 
-  configureFlags = []
-    ++ optional (!gifview) [ "--disable-gifview" ];
+  configureFlags = optional (!gifview) "--disable-gifview";
 
-  LDFLAGS = optional static "-static";
+  LDFLAGS = optionalString static "-static";
 
   doCheck = true;
   checkPhase = ''
diff --git a/pkgs/tools/graphics/graphviz/base.nix b/pkgs/tools/graphics/graphviz/base.nix
index 700bed237bdb..3b9d8a4cca5d 100644
--- a/pkgs/tools/graphics/graphviz/base.nix
+++ b/pkgs/tools/graphics/graphviz/base.nix
@@ -52,7 +52,7 @@ stdenv.mkDerivation {
   configureFlags = [
     "--with-ltdl-lib=${libtool.lib}/lib"
     "--with-ltdl-include=${libtool}/include"
-  ] ++ stdenv.lib.optional (xorg == null) [ "--without-x" ];
+  ] ++ stdenv.lib.optional (xorg == null) "--without-x";
 
   inherit patches;
 
diff --git a/pkgs/tools/graphics/zbar/default.nix b/pkgs/tools/graphics/zbar/default.nix
index 9a071e6150f9..7610b4e56fb0 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"