diff --git a/pkgs/development/libraries/opencsg/default.nix b/pkgs/development/libraries/opencsg/default.nix
index 4adebaf72b16..a2675b2d79dc 100644
--- a/pkgs/development/libraries/opencsg/default.nix
+++ b/pkgs/development/libraries/opencsg/default.nix
@@ -2,11 +2,11 @@
 , qmake, GLUT, fixDarwinDylibNames }:
 
 stdenv.mkDerivation rec {
-  version = "1.4.2";
+  version = "1.6.0";
   pname = "opencsg";
   src = fetchurl {
     url = "http://www.opencsg.org/OpenCSG-${version}.tar.gz";
-    sha256 = "1ysazynm759gnw1rdhn9xw9nixnzrlzrc462340a6iif79fyqlnr";
+    hash = "sha256-v4+4Dj4M4R2H3XjdFaDehy27iXLYf1+Jz/xGHvrUe+g=";
   };
 
   nativeBuildInputs = [ qmake ]
@@ -18,15 +18,13 @@ stdenv.mkDerivation rec {
 
   doCheck = false;
 
-  patches = [ ./fix-pro-files.patch ];
-
   preConfigure = ''
     rm example/Makefile src/Makefile
     qmakeFlags=("''${qmakeFlags[@]}" "INSTALLDIR=$out")
   '';
 
   postInstall = ''
-    install -D license.txt "$out/share/doc/opencsg/license.txt"
+    install -D copying.txt "$out/share/doc/opencsg/copying.txt"
   '' + lib.optionalString stdenv.isDarwin ''
     mkdir -p $out/Applications
     mv $out/bin/*.app $out/Applications
@@ -49,7 +47,7 @@ stdenv.mkDerivation rec {
     homepage = "http://www.opencsg.org/";
     platforms = platforms.unix;
     maintainers = [ maintainers.raskin ];
-    license = licenses.gpl2;
+    license = licenses.gpl2Plus;
   };
 }
 
diff --git a/pkgs/development/libraries/opencsg/fix-pro-files.patch b/pkgs/development/libraries/opencsg/fix-pro-files.patch
deleted file mode 100644
index 462b44c8f40c..000000000000
--- a/pkgs/development/libraries/opencsg/fix-pro-files.patch
+++ /dev/null
@@ -1,21 +0,0 @@
-diff -ur OpenCSG-1.4.2-pristine/example/example.pro OpenCSG-1.4.2/example/example.pro
---- OpenCSG-1.4.2-pristine/example/example.pro	2016-09-27 06:11:16.000000000 +0900
-+++ OpenCSG-1.4.2/example/example.pro	2019-05-07 10:45:18.785251737 +0900
-@@ -6,7 +6,9 @@
- INCLUDEPATH += ../include
- LIBS += -L../lib -lopencsg -lGLEW
- 
--INSTALLDIR = /usr/local
-+isEmpty(INSTALLDIR) {
-+  INSTALLDIR = /usr/local
-+}
- INSTALLS += target
- target.path = $$INSTALLDIR/bin
- 
-diff -ur OpenCSG-1.4.2-pristine/opencsg.pro OpenCSG-1.4.2/opencsg.pro
---- OpenCSG-1.4.2-pristine/opencsg.pro	2016-09-27 06:11:16.000000000 +0900
-+++ OpenCSG-1.4.2/opencsg.pro	2019-05-07 10:44:50.578698165 +0900
-@@ -1,2 +1,3 @@
- TEMPLATE = subdirs
- SUBDIRS  = src example
-+CONFIG   += ordered