diff --git a/pkgs/applications/graphics/hugin/default.nix b/pkgs/applications/graphics/hugin/default.nix
index 97181cb0d1b..338b3cf0f97 100644
--- a/pkgs/applications/graphics/hugin/default.nix
+++ b/pkgs/applications/graphics/hugin/default.nix
@@ -1,6 +1,6 @@
 { stdenv, cmake, fetchurl, gnumake, pkgconfig, makeWrapper
 , boost, gettext, tclap, wxGTK
-, freeglut, glew, libXi, libXmu, mesa
+, freeglut, glew, libX11, libXi, libXmu, mesa, cairo
 , autopanosiftc, enblend-enfuse, exiv2, fftw, ilmbase, lensfun, libpng, libtiff
 , openexr, panotools, perlPackages, sqlite, vigra
 }:
@@ -16,7 +16,7 @@ stdenv.mkDerivation rec {
   NIX_CFLAGS_COMPILE = "-I${ilmbase}/include/OpenEXR";
 
   buildInputs = [ boost gettext tclap wxGTK
-                  freeglut glew libXi libXmu mesa
+                  freeglut glew libX11 libXi libXmu mesa cairo
                   exiv2 fftw ilmbase lensfun libtiff libpng openexr panotools
                   sqlite vigra
                   perlPackages.ImageExifTool makeWrapper
diff --git a/pkgs/applications/graphics/leocad/default.nix b/pkgs/applications/graphics/leocad/default.nix
index eaaf047c9bb..9ca9c592102 100644
--- a/pkgs/applications/graphics/leocad/default.nix
+++ b/pkgs/applications/graphics/leocad/default.nix
@@ -16,8 +16,11 @@ stdenv.mkDerivation rec {
 
   buildInputs = [ qt4 zlib ];
 
-  prefixKey="INSTALL_PREFIX=";
+  prefixKey = "INSTALL_PREFIX=";
   configureScript = "qmake leocad.pro";
+  postPatch = ''
+    substituteInPlace common/camera.cpp --replace "isnan(" "std::isnan("
+  '';
 
   meta = with stdenv.lib; {
     description = "CAD program for creating virtual LEGO models";
diff --git a/pkgs/games/zoom/default.nix b/pkgs/games/zoom/default.nix
index 200b9c24c7d..d6e79289525 100644
--- a/pkgs/games/zoom/default.nix
+++ b/pkgs/games/zoom/default.nix
@@ -2,21 +2,26 @@
 
 # !!! assert freetype == xorg.freetype
 
-stdenv.mkDerivation {
+stdenv.mkDerivation rec {
   name = "zoom-1.1.5";
   
   src = fetchurl {
-    url = http://www.logicalshift.co.uk/unix/zoom/zoom-1.1.5.tar.gz;
+    url = "http://www.logicalshift.co.uk/unix/zoom/${name}.tar.gz";
     sha256 = "1g6van7f7sg3zfcz80mncnnbccyg2hnm0hq4x558vpsm0lf7z5pj";
   };
   
   buildInputs = [ perl expat xlibsWrapper freetype ];
   
-  # Zoom doesn't add the right directory in the include path.
-  CFLAGS = [ "-I" (freetype + "/include/freetype2") ];
+  NIX_CFLAGS_COMPILE = [
+    # Zoom doesn't add the right directory in the include path.
+    "-I" (freetype + "/include/freetype2")
+
+    # for gcc5; c11 inline semantics breaks the build
+    "-fgnu89-inline"
+  ];
 
   meta = with stdenv.lib; {
-    description = "Player for Z-Code, TADS and HUGO stories or games, usually text adventures ('interactive fiction')";
+    description = "Player for Z-Code, TADS and HUGO stories or games";
     longDescription = ''
       Zoom is a player for Z-Code, TADS and HUGO stories or games. These are
       usually text adventures ('interactive fiction'), and were first created
diff --git a/pkgs/tools/filesystems/udftools/default.nix b/pkgs/tools/filesystems/udftools/default.nix
index 329950f8969..7cb924c6cf1 100644
--- a/pkgs/tools/filesystems/udftools/default.nix
+++ b/pkgs/tools/filesystems/udftools/default.nix
@@ -10,9 +10,15 @@ stdenv.mkDerivation rec {
 
   buildInputs = [ ncurses readline ];
 
+  NIX_CFLAGS_COMPILE = "-std=gnu90";
+
   preConfigure = ''
     sed -e '1i#include <limits.h>' -i cdrwtool/cdrwtool.c -i pktsetup/pktsetup.c
     sed -e 's@[(]char[*][)]spm [+]=@spm = ((char*) spm) + @' -i wrudf/wrudf.c
+    sed -e '27i#include <string.h>' -i include/udf_endian.h
+    sed -e '38i#include <string.h>' -i wrudf/wrudf-cdrw.c
+    sed -e '12i#include <string.h>' -i wrudf/wrudf-cdr.c
+    sed -e '37i#include <stdlib.h>' -i wrudf/ide-pc.c
   '';
 
   meta = with stdenv.lib; {
diff --git a/pkgs/tools/misc/yad/default.nix b/pkgs/tools/misc/yad/default.nix
index d884d48f521..2c8660a4913 100644
--- a/pkgs/tools/misc/yad/default.nix
+++ b/pkgs/tools/misc/yad/default.nix
@@ -13,10 +13,18 @@ stdenv.mkDerivation rec {
     "--enable-icon-browser"
   ];
 
+  # for gcc5: c11 inline semantics breaks the build
+  NIX_CFLAGS_COMPILE = "-fgnu89-inline";
+
   buildInputs = [ gtk2 ];
 
   nativeBuildInputs = [ pkgconfig intltool ];
 
+  postPatch = ''
+    sed -i src/file.c -e '21i#include <glib/gprintf.h>'
+    sed -i src/form.c -e '21i#include <stdlib.h>'
+  '';
+
   preFixup = "rm $out/share/icons/hicolor/icon-theme.cache";
 
   meta = {