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-rw-r--r--pkgs/development/libraries/fontconfig/default.nix8
-rw-r--r--pkgs/development/libraries/gnet/default.nix2
-rw-r--r--pkgs/development/libraries/gnome/GConf/default.nix6
-rw-r--r--pkgs/development/libraries/gnome/ORBit2/default.nix4
-rw-r--r--pkgs/development/libraries/gnome/esound/default.nix2
-rw-r--r--pkgs/development/libraries/gnome/gnome-mime-data/default.nix2
-rw-r--r--pkgs/development/libraries/gnome/gnome-vfs/default.nix6
-rw-r--r--pkgs/development/libraries/gnome/libIDL/default.nix2
-rw-r--r--pkgs/development/libraries/gnome/libbonobo/default.nix4
-rw-r--r--pkgs/development/libraries/gnome/libbonoboui/default.nix4
-rw-r--r--pkgs/development/libraries/gnome/libglade/default.nix2
-rw-r--r--pkgs/development/libraries/gnome/libgnome/default.nix6
-rw-r--r--pkgs/development/libraries/gnome/libgnomecanvas/default.nix4
-rw-r--r--pkgs/development/libraries/gnome/libgnomeui/default.nix4
-rw-r--r--pkgs/development/libraries/gtk+-1/gdk-pixbuf/default.nix4
-rw-r--r--pkgs/development/libraries/gtk+-1/gtk+/default.nix2
-rw-r--r--pkgs/development/libraries/gtk+/atk/default.nix2
-rw-r--r--pkgs/development/libraries/gtk+/glib/default.nix2
-rw-r--r--pkgs/development/libraries/gtk+/gtk+/default.nix6
-rw-r--r--pkgs/development/libraries/gtk+/pango/default.nix2
-rw-r--r--pkgs/development/libraries/libdvdplay/default.nix2
-rw-r--r--pkgs/development/libraries/libdvdread/default.nix2
-rw-r--r--pkgs/development/libraries/libpng/default.nix2
-rw-r--r--pkgs/development/libraries/libtiff/default.nix2
-rw-r--r--pkgs/development/libraries/libxml2/default.nix2
-rw-r--r--pkgs/development/libraries/libxslt/default.nix2
-rw-r--r--pkgs/development/libraries/popt/default.nix2
-rw-r--r--pkgs/development/libraries/scrollkeeper/default.nix4
-rw-r--r--pkgs/development/libraries/wxGTK/default.nix10
-rw-r--r--pkgs/development/libraries/xft/default.nix2
-rw-r--r--pkgs/development/libraries/zvbi/default.nix4
31 files changed, 54 insertions, 54 deletions
diff --git a/pkgs/development/libraries/fontconfig/default.nix b/pkgs/development/libraries/fontconfig/default.nix
index 15944697423e..c9340043d90f 100644
--- a/pkgs/development/libraries/fontconfig/default.nix
+++ b/pkgs/development/libraries/fontconfig/default.nix
@@ -1,9 +1,9 @@
 {stdenv, fetchurl, x11, freetype, expat, ed}:
 
-assert !isNull x11 && x11.buildClientLibs;
-assert !isNull freetype;
-assert !isNull expat;
-assert !isNull ed;
+assert x11 != null && x11.buildClientLibs;
+assert freetype != null;
+assert expat != null;
+assert ed != null;
 
 derivation {
   name = "fontconfig-2.2.90";
diff --git a/pkgs/development/libraries/gnet/default.nix b/pkgs/development/libraries/gnet/default.nix
index 0475dfa06ab1..cccf0e0d36c1 100644
--- a/pkgs/development/libraries/gnet/default.nix
+++ b/pkgs/development/libraries/gnet/default.nix
@@ -1,6 +1,6 @@
 {stdenv, fetchurl, pkgconfig, glib}:
 
-assert !isNull pkgconfig && !isNull glib;
+assert pkgconfig != null && glib != null;
 
 derivation {
   name = "gnet-2.0.4";
diff --git a/pkgs/development/libraries/gnome/GConf/default.nix b/pkgs/development/libraries/gnome/GConf/default.nix
index 0c6f0dfe0105..31f144b1d79d 100644
--- a/pkgs/development/libraries/gnome/GConf/default.nix
+++ b/pkgs/development/libraries/gnome/GConf/default.nix
@@ -1,8 +1,8 @@
 {stdenv, fetchurl, pkgconfig, perl, glib, gtk, libxml2, ORBit2, popt}:
 
-assert !isNull pkgconfig && !isNull perl
-  && !isNull glib && !isNull gtk
-  && !isNull libxml2 && !isNull ORBit2 && !isNull popt;
+assert pkgconfig != null && perl != null
+  && glib != null && gtk != null
+  && libxml2 != null && ORBit2 != null && popt != null;
 
 derivation {
   name = "GConf-2.4.0.1";
diff --git a/pkgs/development/libraries/gnome/ORBit2/default.nix b/pkgs/development/libraries/gnome/ORBit2/default.nix
index 8af6c7fe4ecc..8203db963ca9 100644
--- a/pkgs/development/libraries/gnome/ORBit2/default.nix
+++ b/pkgs/development/libraries/gnome/ORBit2/default.nix
@@ -1,7 +1,7 @@
 {stdenv, fetchurl, pkgconfig, glib, libIDL, popt}:
 
-assert !isNull pkgconfig && !isNull glib && !isNull libIDL
-  && !isNull popt;
+assert pkgconfig != null && glib != null && libIDL != null
+  && popt != null;
 
 derivation {
   name = "ORBit2-2.8.3";
diff --git a/pkgs/development/libraries/gnome/esound/default.nix b/pkgs/development/libraries/gnome/esound/default.nix
index cf70712cd6d5..7e51b9d6fba6 100644
--- a/pkgs/development/libraries/gnome/esound/default.nix
+++ b/pkgs/development/libraries/gnome/esound/default.nix
@@ -1,6 +1,6 @@
 {stdenv, fetchurl, audiofile}:
 
-assert !isNull audiofile;
+assert audiofile != null;
 
 derivation {
   name = "esound-0.2.32";
diff --git a/pkgs/development/libraries/gnome/gnome-mime-data/default.nix b/pkgs/development/libraries/gnome/gnome-mime-data/default.nix
index 62e32d01e4da..ffcd6d19a78c 100644
--- a/pkgs/development/libraries/gnome/gnome-mime-data/default.nix
+++ b/pkgs/development/libraries/gnome/gnome-mime-data/default.nix
@@ -1,6 +1,6 @@
 {stdenv, fetchurl, pkgconfig, perl}:
 
-assert !isNull pkgconfig && !isNull perl;
+assert pkgconfig != null && perl != null;
 
 derivation {
   name = "gnome-mime-data-2.4.0";
diff --git a/pkgs/development/libraries/gnome/gnome-vfs/default.nix b/pkgs/development/libraries/gnome/gnome-vfs/default.nix
index a67c2f20deaf..b2cd632f6ce7 100644
--- a/pkgs/development/libraries/gnome/gnome-vfs/default.nix
+++ b/pkgs/development/libraries/gnome/gnome-vfs/default.nix
@@ -1,9 +1,9 @@
 { stdenv, fetchurl, pkgconfig, perl, glib, libxml2, GConf
 , libbonobo, gnomemimedata, popt, bzip2 }:
 
-assert !isNull pkgconfig && !isNull perl && !isNull glib
-  && !isNull libxml2 && !isNull GConf && !isNull libbonobo
-  && !isNull gnomemimedata && !isNull bzip2;
+assert pkgconfig != null && perl != null && glib != null
+  && libxml2 != null && GConf != null && libbonobo != null
+  && gnomemimedata != null && bzip2 != null;
 
 derivation {
   name = "gnome-vfs-2.4.1";
diff --git a/pkgs/development/libraries/gnome/libIDL/default.nix b/pkgs/development/libraries/gnome/libIDL/default.nix
index a7df8988350a..e6ab1cb019b4 100644
--- a/pkgs/development/libraries/gnome/libIDL/default.nix
+++ b/pkgs/development/libraries/gnome/libIDL/default.nix
@@ -1,6 +1,6 @@
 {stdenv, fetchurl, pkgconfig, glib, lex, yacc}:
 
-assert !isNull pkgconfig && !isNull glib && !isNull lex && !isNull yacc;
+assert pkgconfig != null && glib != null && lex != null && yacc != null;
 
 derivation {
   name = "libIDL-0.8.2";
diff --git a/pkgs/development/libraries/gnome/libbonobo/default.nix b/pkgs/development/libraries/gnome/libbonobo/default.nix
index 9e50e61ac848..c2a6adb9ecef 100644
--- a/pkgs/development/libraries/gnome/libbonobo/default.nix
+++ b/pkgs/development/libraries/gnome/libbonobo/default.nix
@@ -1,7 +1,7 @@
 {stdenv, fetchurl, pkgconfig, perl, ORBit2, libxml2, popt, yacc, flex}:
 
-assert !isNull pkgconfig && !isNull perl && !isNull ORBit2
-  && !isNull libxml2 && !isNull popt && !isNull yacc && !isNull flex;
+assert pkgconfig != null && perl != null && ORBit2 != null
+  && libxml2 != null && popt != null && yacc != null && flex != null;
 
 derivation {
   name = "libbonobo-2.4.2";
diff --git a/pkgs/development/libraries/gnome/libbonoboui/default.nix b/pkgs/development/libraries/gnome/libbonoboui/default.nix
index 8abe0bee2a1f..3efa13fe151d 100644
--- a/pkgs/development/libraries/gnome/libbonoboui/default.nix
+++ b/pkgs/development/libraries/gnome/libbonoboui/default.nix
@@ -1,8 +1,8 @@
 {stdenv, fetchurl, pkgconfig, perl, libxml2, libglade, libgnome
 , libgnomecanvas}:
 
-assert !isNull pkgconfig && !isNull perl && !isNull libxml2
-  && !isNull libglade && !isNull libgnome && !isNull libgnomecanvas;
+assert pkgconfig != null && perl != null && libxml2 != null
+  && libglade != null && libgnome != null && libgnomecanvas != null;
 
 derivation {
   name = "libbonoboui-2.4.1";
diff --git a/pkgs/development/libraries/gnome/libglade/default.nix b/pkgs/development/libraries/gnome/libglade/default.nix
index a8d1cc658270..543586eb20a5 100644
--- a/pkgs/development/libraries/gnome/libglade/default.nix
+++ b/pkgs/development/libraries/gnome/libglade/default.nix
@@ -1,6 +1,6 @@
 {stdenv, fetchurl, pkgconfig, gtk, libxml2}:
 
-assert !isNull pkgconfig && !isNull gtk && !isNull libxml2;
+assert pkgconfig != null && gtk != null && libxml2 != null;
 
 derivation {
   name = "libglade-2.0.1";
diff --git a/pkgs/development/libraries/gnome/libgnome/default.nix b/pkgs/development/libraries/gnome/libgnome/default.nix
index 35c43c67a151..d33a54cf7a28 100644
--- a/pkgs/development/libraries/gnome/libgnome/default.nix
+++ b/pkgs/development/libraries/gnome/libgnome/default.nix
@@ -1,9 +1,9 @@
 { stdenv, fetchurl, pkgconfig, perl, glib, gnomevfs, libbonobo
 , GConf, popt, zlib }:
 
-assert !isNull pkgconfig && !isNull perl && !isNull glib
-  && !isNull gnomevfs && !isNull libbonobo && !isNull GConf
-  && !isNull popt && !isNull zlib;
+assert pkgconfig != null && perl != null && glib != null
+  && gnomevfs != null && libbonobo != null && GConf != null
+  && popt != null && zlib != null;
 
 # !!! TO CHECK:
 # libgnome tries to install stuff into GConf (which fails):
diff --git a/pkgs/development/libraries/gnome/libgnomecanvas/default.nix b/pkgs/development/libraries/gnome/libgnomecanvas/default.nix
index 4802da9dab99..fef31114b1b8 100644
--- a/pkgs/development/libraries/gnome/libgnomecanvas/default.nix
+++ b/pkgs/development/libraries/gnome/libgnomecanvas/default.nix
@@ -1,7 +1,7 @@
 {stdenv, fetchurl, pkgconfig, gtk, libart, libglade}:
 
-assert !isNull pkgconfig && !isNull gtk && !isNull libart
-  && !isNull libglade;
+assert pkgconfig != null && gtk != null && libart != null
+  && libglade != null;
 
 derivation {
   name = "libgnomecanvas-2.4.0";
diff --git a/pkgs/development/libraries/gnome/libgnomeui/default.nix b/pkgs/development/libraries/gnome/libgnomeui/default.nix
index 23f6b5e5b2df..9a97d7697a95 100644
--- a/pkgs/development/libraries/gnome/libgnomeui/default.nix
+++ b/pkgs/development/libraries/gnome/libgnomeui/default.nix
@@ -1,7 +1,7 @@
 { stdenv, fetchurl, pkgconfig, libgnome, libgnomecanvas, libbonoboui, libglade }:
 
-assert !isNull pkgconfig && !isNull libgnome && !isNull libgnomecanvas
-  && !isNull libbonoboui && !isNull libglade;
+assert pkgconfig != null && libgnome != null && libgnomecanvas != null
+  && libbonoboui != null && libglade != null;
 
 derivation {
   name = "libgnomeui-2.4.0.1";
diff --git a/pkgs/development/libraries/gtk+-1/gdk-pixbuf/default.nix b/pkgs/development/libraries/gtk+-1/gdk-pixbuf/default.nix
index 1b05fdb0ea43..dbf194171c93 100644
--- a/pkgs/development/libraries/gtk+-1/gdk-pixbuf/default.nix
+++ b/pkgs/development/libraries/gtk+-1/gdk-pixbuf/default.nix
@@ -1,7 +1,7 @@
 {stdenv, fetchurl, gtk, libtiff, libjpeg, libpng}:
 
-assert !isNull gtk && !isNull libtiff
-  && !isNull libjpeg && !isNull libpng;
+assert gtk != null && libtiff != null
+  && libjpeg != null && libpng != null;
 
 derivation {
   name = "gdk-pixbuf-0.22.0";
diff --git a/pkgs/development/libraries/gtk+-1/gtk+/default.nix b/pkgs/development/libraries/gtk+-1/gtk+/default.nix
index fc8f45736d97..7ee815ec5f68 100644
--- a/pkgs/development/libraries/gtk+-1/gtk+/default.nix
+++ b/pkgs/development/libraries/gtk+-1/gtk+/default.nix
@@ -1,6 +1,6 @@
 {stdenv, fetchurl, x11, glib}:
 
-assert !isNull x11 && !isNull glib;
+assert x11 != null && glib != null;
 assert x11.buildClientLibs;
 
 derivation {
diff --git a/pkgs/development/libraries/gtk+/atk/default.nix b/pkgs/development/libraries/gtk+/atk/default.nix
index 8db047f9c492..7d45fbca050e 100644
--- a/pkgs/development/libraries/gtk+/atk/default.nix
+++ b/pkgs/development/libraries/gtk+/atk/default.nix
@@ -1,6 +1,6 @@
 {stdenv, fetchurl, pkgconfig, glib, perl}:
 
-assert !isNull pkgconfig && !isNull glib && !isNull perl;
+assert pkgconfig != null && glib != null && perl != null;
 
 derivation {
   name = "atk-1.2.4";
diff --git a/pkgs/development/libraries/gtk+/glib/default.nix b/pkgs/development/libraries/gtk+/glib/default.nix
index 227aa80f17d2..88bb12593735 100644
--- a/pkgs/development/libraries/gtk+/glib/default.nix
+++ b/pkgs/development/libraries/gtk+/glib/default.nix
@@ -1,6 +1,6 @@
 {stdenv, fetchurl, pkgconfig, gettext, perl}:
 
-assert !isNull pkgconfig && !isNull gettext && !isNull perl;
+assert pkgconfig != null && gettext != null && perl != null;
 
 derivation {
   name = "glib-2.2.3";
diff --git a/pkgs/development/libraries/gtk+/gtk+/default.nix b/pkgs/development/libraries/gtk+/gtk+/default.nix
index f0fe5979d0b7..1437221c813c 100644
--- a/pkgs/development/libraries/gtk+/gtk+/default.nix
+++ b/pkgs/development/libraries/gtk+/gtk+/default.nix
@@ -1,9 +1,9 @@
 { stdenv, fetchurl, pkgconfig, x11, glib, atk
 , pango, perl, libtiff, libjpeg, libpng}:
 
-assert !isNull pkgconfig && !isNull x11 && !isNull glib && !isNull atk
-  && !isNull pango && !isNull perl && !isNull perl && !isNull libtiff
-  && !isNull libjpeg && !isNull libpng;
+assert pkgconfig != null && x11 != null && glib != null && atk != null
+  && pango != null && perl != null && perl != null && libtiff != null
+  && libjpeg != null && libpng != null;
 assert x11.buildClientLibs;
 assert glib == atk.glib;
 assert glib == pango.glib;
diff --git a/pkgs/development/libraries/gtk+/pango/default.nix b/pkgs/development/libraries/gtk+/pango/default.nix
index d598d97f9c37..36731123e56f 100644
--- a/pkgs/development/libraries/gtk+/pango/default.nix
+++ b/pkgs/development/libraries/gtk+/pango/default.nix
@@ -1,6 +1,6 @@
 {stdenv, fetchurl, pkgconfig, x11, glib, xft}:
 
-assert !isNull pkgconfig && !isNull x11 && !isNull glib && !isNull xft;
+assert pkgconfig != null && x11 != null && glib != null && xft != null;
 assert x11.buildClientLibs;
 assert xft.x11 == x11;
 
diff --git a/pkgs/development/libraries/libdvdplay/default.nix b/pkgs/development/libraries/libdvdplay/default.nix
index b038d0e77dbb..7c4d67dbb021 100644
--- a/pkgs/development/libraries/libdvdplay/default.nix
+++ b/pkgs/development/libraries/libdvdplay/default.nix
@@ -1,6 +1,6 @@
 {stdenv, fetchurl, libdvdread}:
 
-assert !isNull libdvdread;
+assert libdvdread != null;
 
 derivation {
   name = "libdvdplay-1.0.1";
diff --git a/pkgs/development/libraries/libdvdread/default.nix b/pkgs/development/libraries/libdvdread/default.nix
index 6c4f782d237b..11da28b6f854 100644
--- a/pkgs/development/libraries/libdvdread/default.nix
+++ b/pkgs/development/libraries/libdvdread/default.nix
@@ -1,6 +1,6 @@
 {stdenv, fetchurl, libdvdcss}:
 
-assert !isNull libdvdcss;
+assert libdvdcss != null;
 
 derivation {
   name = "libdvdread-20030812";
diff --git a/pkgs/development/libraries/libpng/default.nix b/pkgs/development/libraries/libpng/default.nix
index 47322de7d175..5e0d65dc02ea 100644
--- a/pkgs/development/libraries/libpng/default.nix
+++ b/pkgs/development/libraries/libpng/default.nix
@@ -1,6 +1,6 @@
 {stdenv, fetchurl, zlib}:
 
-assert !isNull zlib;
+assert zlib != null;
 
 derivation {
   name = "libpng-1.2.5";
diff --git a/pkgs/development/libraries/libtiff/default.nix b/pkgs/development/libraries/libtiff/default.nix
index 7a14a63ce337..7b16f5f067ce 100644
--- a/pkgs/development/libraries/libtiff/default.nix
+++ b/pkgs/development/libraries/libtiff/default.nix
@@ -1,6 +1,6 @@
 {stdenv, fetchurl, zlib, libjpeg}:
 
-assert !isNull zlib && !isNull libjpeg;
+assert zlib != null && libjpeg != null;
 
 derivation {
   name = "libtiff-3.5.7";
diff --git a/pkgs/development/libraries/libxml2/default.nix b/pkgs/development/libraries/libxml2/default.nix
index 4eb33f53d012..7533451029e3 100644
--- a/pkgs/development/libraries/libxml2/default.nix
+++ b/pkgs/development/libraries/libxml2/default.nix
@@ -1,6 +1,6 @@
 {stdenv, fetchurl, zlib}:
 
-assert !isNull zlib;
+assert zlib != null;
 
 derivation {
   name = "libxml2-2.6.7";
diff --git a/pkgs/development/libraries/libxslt/default.nix b/pkgs/development/libraries/libxslt/default.nix
index 0d9b29fb309b..b005aca4aaf9 100644
--- a/pkgs/development/libraries/libxslt/default.nix
+++ b/pkgs/development/libraries/libxslt/default.nix
@@ -1,6 +1,6 @@
 {stdenv, fetchurl, libxml2}:
 
-assert !isNull libxml2;
+assert libxml2 != null;
 
 derivation {
   name = "libxslt-1.1.0";
diff --git a/pkgs/development/libraries/popt/default.nix b/pkgs/development/libraries/popt/default.nix
index 11cc43d48f8b..7ad1cb807b7c 100644
--- a/pkgs/development/libraries/popt/default.nix
+++ b/pkgs/development/libraries/popt/default.nix
@@ -1,6 +1,6 @@
 {stdenv, fetchurl, gettext}:
 
-assert !isNull gettext;
+assert gettext != null;
 
 derivation {
   name = "popt-1.7";
diff --git a/pkgs/development/libraries/scrollkeeper/default.nix b/pkgs/development/libraries/scrollkeeper/default.nix
index 33cd0489af2e..5d86dff1e0e1 100644
--- a/pkgs/development/libraries/scrollkeeper/default.nix
+++ b/pkgs/development/libraries/scrollkeeper/default.nix
@@ -1,8 +1,8 @@
 { stdenv, fetchurl, perl, libxml2, libxslt, docbook_xml_dtd
 , perlXMLParser}:
 
-assert !isNull perl && !isNull libxml2 && !isNull libxslt
-  && !isNull docbook_xml_dtd && !isNull perlXMLParser;
+assert perl != null && libxml2 != null && libxslt != null
+  && docbook != null_xml_dtd && perlXMLParser != null;
 
 # !!! seems to need iconv, but cannot find it since $glibc/bin is not in PATH
 
diff --git a/pkgs/development/libraries/wxGTK/default.nix b/pkgs/development/libraries/wxGTK/default.nix
index 0645de6495d7..039579c2d543 100644
--- a/pkgs/development/libraries/wxGTK/default.nix
+++ b/pkgs/development/libraries/wxGTK/default.nix
@@ -1,10 +1,10 @@
 {stdenv, fetchurl, pkgconfig, gtk, compat22 ? true}:
 
-assert !isNull pkgconfig && !isNull gtk;
-assert !isNull gtk.libtiff;
-assert !isNull gtk.libjpeg;
-assert !isNull gtk.libpng;
-assert !isNull gtk.libpng.zlib;
+assert pkgconfig != null && gtk != null;
+assert gtk.libtiff != null;
+assert gtk.libjpeg != null;
+assert gtk.libpng != null;
+assert gtk.libpng.zlib != null;
 
 derivation {
   name = "wxGTK-2.4.2";
diff --git a/pkgs/development/libraries/xft/default.nix b/pkgs/development/libraries/xft/default.nix
index 0764a1dd80ad..ea1cef2cfe6d 100644
--- a/pkgs/development/libraries/xft/default.nix
+++ b/pkgs/development/libraries/xft/default.nix
@@ -1,6 +1,6 @@
 {stdenv, fetchurl, pkgconfig, x11, fontconfig}:
 
-assert !isNull pkgconfig && !isNull x11 && !isNull fontconfig;
+assert pkgconfig != null && x11 != null && fontconfig != null;
 assert fontconfig.x11 == x11;
 
 derivation {
diff --git a/pkgs/development/libraries/zvbi/default.nix b/pkgs/development/libraries/zvbi/default.nix
index 55a106b349e3..54de0c92816a 100644
--- a/pkgs/development/libraries/zvbi/default.nix
+++ b/pkgs/development/libraries/zvbi/default.nix
@@ -1,8 +1,8 @@
 { pngSupport ? true
 , stdenv, fetchurl, x11, libpng ? null}:
 
-assert !isNull x11;
-assert pngSupport -> !isNull libpng;
+assert x11 != null;
+assert pngSupport -> libpng != null;
 
 derivation {
   name = "zvbi-0.2.5";