9 files changed, 9 insertions, 9 deletions
diff --git a/pkgs/tools/graphics/enblend-enfuse/default.nix b/pkgs/tools/graphics/enblend-enfuse/default.nix
index b77d63d510df..2d1a6472205e 100644
--- a/pkgs/tools/graphics/enblend-enfuse/default.nix
+++ b/pkgs/tools/graphics/enblend-enfuse/default.nix
@@ -32,6 +32,6 @@ stdenv.mkDerivation rec {
   meta = {
     homepage = http://enblend.sourceforge.net/;
     description = "Blends away the seams in a panoramic image mosaic using a multiresolution spline";
-    license = "GPLv2";
+    license = stdenv.lib.licenses.gpl2;
   };
 }
diff --git a/pkgs/tools/graphics/gifsicle/default.nix b/pkgs/tools/graphics/gifsicle/default.nix
index debc340ee4ce..dc1a8b3abaee 100644
--- a/pkgs/tools/graphics/gifsicle/default.nix
+++ b/pkgs/tools/graphics/gifsicle/default.nix
@@ -17,6 +17,6 @@ stdenv.mkDerivation {
   meta = { 
     description = "Command-line tool for creating, editing, and getting information about GIF images and animations";
     homepage = http://www.lcdf.org/gifsicle/;
-    license = "GPL2";
+    license = stdenv.lib.licenses.gpl2;
   };
 }
diff --git a/pkgs/tools/graphics/icoutils/default.nix b/pkgs/tools/graphics/icoutils/default.nix
index 10cd9adf2b3c..94a613078a47 100644
--- a/pkgs/tools/graphics/icoutils/default.nix
+++ b/pkgs/tools/graphics/icoutils/default.nix
@@ -13,7 +13,7 @@ stdenv.mkDerivation rec {
   meta = {
     homepage = http://www.nongnu.org/icoutils/;
     description = "Set of  programs to deal with Microsoft Windows(R) icon and cursor files";
-    license = "GPLv3+";
+    license = stdenv.lib.licenses.gpl3Plus;
     platforms = with stdenv.lib.platforms; linux;
   };
 }
diff --git a/pkgs/tools/graphics/mscgen/default.nix b/pkgs/tools/graphics/mscgen/default.nix
index ed69327b752a..36a75743ed8a 100644
--- a/pkgs/tools/graphics/mscgen/default.nix
+++ b/pkgs/tools/graphics/mscgen/default.nix
@@ -21,7 +21,7 @@ stdenv.mkDerivation {
   meta = {
     homepage = http://www.mcternan.me.uk/mscgen/;
     description = "Convert Message Sequence Chart descriptions into PNG, SVG, or EPS images";
-    license = "GPLv2";
+    license = stdenv.lib.licenses.gpl2;
 
     longDescription = ''
       Mscgen is a small program that parses Message Sequence Chart
diff --git a/pkgs/tools/graphics/panomatic/default.nix b/pkgs/tools/graphics/panomatic/default.nix
index 1a7c3317cf9f..f14c16775f8d 100644
--- a/pkgs/tools/graphics/panomatic/default.nix
+++ b/pkgs/tools/graphics/panomatic/default.nix
@@ -13,6 +13,6 @@ stdenv.mkDerivation {
   meta = {
     homepage = http://aorlinsk2.free.fr/panomatic/;
     description = "Tool that automates the creation of control points in Hugin";
-    license = "GPLv2+";
+    license = stdenv.lib.licenses.gpl2Plus;
   };
 }
diff --git a/pkgs/tools/graphics/ploticus/default.nix b/pkgs/tools/graphics/ploticus/default.nix
index 857a86d57af1..92dce64dcfd4 100644
--- a/pkgs/tools/graphics/ploticus/default.nix
+++ b/pkgs/tools/graphics/ploticus/default.nix
@@ -23,7 +23,7 @@ stdenv.mkDerivation {
       statistical capabilities.  It allows significant user control
       over colors, styles, options and details.'';
 
-    license = "GPLv2+";
+    license = stdenv.lib.licenses.gpl2Plus;
     homepage = http://ploticus.sourceforge.net/;
   };
 }
diff --git a/pkgs/tools/graphics/plotutils/default.nix b/pkgs/tools/graphics/plotutils/default.nix
index bb250b9d8523..ae0c4d197315 100644
--- a/pkgs/tools/graphics/plotutils/default.nix
+++ b/pkgs/tools/graphics/plotutils/default.nix
@@ -42,7 +42,7 @@ stdenv.mkDerivation rec {
 
     homepage = http://www.gnu.org/software/plotutils/;
 
-    license = "GPLv2+";
+    license = stdenv.lib.licenses.gpl2Plus;
     maintainers = [
       stdenv.lib.maintainers.marcweber
       stdenv.lib.maintainers.ludo
diff --git a/pkgs/tools/graphics/pngtoico/default.nix b/pkgs/tools/graphics/pngtoico/default.nix
index df1046cb750f..fe01a9459ecb 100644
--- a/pkgs/tools/graphics/pngtoico/default.nix
+++ b/pkgs/tools/graphics/pngtoico/default.nix
@@ -17,7 +17,7 @@ stdenv.mkDerivation rec {
   meta = {
     homepage = http://www.kernel.org/pub/software/graphics/pngtoico/;
     description = "Small utility to convert a set of PNG images to Microsoft ICO format";
-    license = "GPLv2+";
+    license = stdenv.lib.licenses.gpl2Plus;
     platforms = with stdenv.lib.platforms; linux;
   };
 }
diff --git a/pkgs/tools/graphics/pstoedit/default.nix b/pkgs/tools/graphics/pstoedit/default.nix
index 62816705b8f0..d4e977128cfe 100644
--- a/pkgs/tools/graphics/pstoedit/default.nix
+++ b/pkgs/tools/graphics/pstoedit/default.nix
@@ -13,7 +13,7 @@ stdenv.mkDerivation {
   meta = { 
     description = "translates PostScript and PDF graphics into other vector formats";
     homepage = http://www.helga-glunz.homepage.t-online.de/pstoedit;
-    license = "GPLv2";
+    license = stdenv.lib.licenses.gpl2;
     maintainers = [ stdenv.lib.maintainers.marcweber ];
     platforms = stdenv.lib.platforms.linux;
   };