diff --git a/pkgs/development/compilers/gcc-4.4/builder.sh b/pkgs/development/compilers/gcc-4.4/builder.sh
index 5f14ae92d1cb..c3ec4cec3155 100644
--- a/pkgs/development/compilers/gcc-4.4/builder.sh
+++ b/pkgs/development/compilers/gcc-4.4/builder.sh
@@ -42,22 +42,10 @@ if test "$noSysDirs" = "1"; then
 
     # Setting $CPATH makes sure both `gcc' and `xgcc' find the C
     # library headers, regarless of the language being compiled.
-    export CPATH="$NIX_FIXINC_DUMMY:$gmp/include:$mpfr/include"
+    export CPATH="$NIX_FIXINC_DUMMY:$CPATH"
 
     # Likewise, to help it find `crti.o' and similar files.
-    export LIBRARY_PATH="$glibc_libdir"
-
-    if test "$langJava" = "1"; then
-	for lib in "$zlib" "$boehmgc" "$libX11" "$libXt" "$libSM" \
-	    "$libICE" "$libXtst"
-	do
-	    if test -n "$lib"
-	    then
-		export CPATH="$CPATH:$lib/include"
-		export LIBRARY_PATH="$LIBRARY_PATH:$lib/lib"
-	    fi
-	done
-    fi
+    export LIBRARY_PATH="$glibc_libdir:$LIBRARY_PATH"
 
     echo "setting \$CPATH to \`$CPATH'"
     echo "setting \$LIBRARY_PATH to \`$LIBRARY_PATH'"
diff --git a/pkgs/development/compilers/gcc-4.4/default.nix b/pkgs/development/compilers/gcc-4.4/default.nix
index fdb26d713291..fc6592fbe7b2 100644
--- a/pkgs/development/compilers/gcc-4.4/default.nix
+++ b/pkgs/development/compilers/gcc-4.4/default.nix
@@ -10,15 +10,14 @@
 , zlib ? null, boehmgc ? null
 , zip ? null, unzip ? null, pkgconfig ? null, gtk ? null, libart_lgpl ? null
 , libX11 ? null, libXt ? null, libSM ? null, libICE ? null, libXtst ? null
+, xproto ? null
 , enableMultilib ? false
 , name ? "gcc"
 }:
 
 assert langTreelang -> bison != null && flex != null;
-assert langJava     -> zip != null && unzip != null;
-assert gtk != null  -> pkgconfig != null && libart_lgpl != null
-                       && libX11 != null && libXt != null && libSM != null
-                       && libICE != null && libXtst != null;
+assert langJava     -> zip != null && unzip != null
+                       && zlib != null && boehmgc != null;
 
 with stdenv.lib;
 
@@ -31,9 +30,13 @@ let version = "4.4.1";
       url = "ftp://sourceware.org/pub/java/ecj-4.3.jar";
       sha256 = "0jz7hvc0s6iydmhgh5h2m15yza7p2rlss2vkif30vm9y77m97qcx";
     };
+    xlibs = [ libX11 libXt libSM libICE libXtst xproto ];
 
 in
 
+# We need all these X libraries when building AWT with GTK+.
+assert gtk != null -> (filter (x: x == null) xlibs) == [];
+
 stdenv.mkDerivation ({
   name = "${name}-${version}";
 
@@ -74,8 +77,7 @@ stdenv.mkDerivation ({
     ++ (optional (zlib != null) zlib)
     ++ (optional (boehmgc != null) boehmgc)
     ++ (optionals langJava [zip unzip])
-    ++ (optionals (gtk != null)
-         [gtk pkgconfig libart_lgpl libX11 libXt libSM libICE libXtst])
+    ++ (optionals (gtk != null) [gtk pkgconfig libart_lgpl] ++ xlibs)
     ;
 
   configureFlags = "
@@ -84,6 +86,8 @@ stdenv.mkDerivation ({
     ${if cloogppl != null then "--with-cloog=${cloogppl}" else ""}
     ${if langJava then "--with-ecj-jar=${javaEcj}" else ""}
     ${if (langJava && gtk != null) then "--enable-java-awt=gtk" else ""}
+    --with-gmp=${gmp}
+    --with-mpfr=${mpfr}
     --disable-libstdcxx-pch
     --without-included-gettext
     --with-system-zlib
@@ -100,8 +104,22 @@ stdenv.mkDerivation ({
     ${if stdenv.isi686 then "--with-arch=i686" else ""}
   ";
 
-  inherit gmp mpfr zlib boehmgc;
-  inherit libX11 libXt libSM libICE libXtst;
+  # Setting $CPATH and $LIBRARY_PATH to make sure both `gcc' and `xgcc' find
+  # the library headers and binaries, regarless of the language being
+  # compiled.
+
+  CPATH = concatStrings
+            (intersperse ":" (map (x: x + "/include")
+                                  ([ zlib ]
+                                   ++ optional  langJava boehmgc
+                                   ++ optionals (gtk != null) xlibs)));
+
+  LIBRARY_PATH = concatStrings
+                   (intersperse ":" (map (x: x + "/lib")
+                                         ([ zlib ]
+                                          ++ optional  langJava boehmgc
+                                          ++ optionals (gtk != null) xlibs)));
+
 
   passthru = { inherit langC langCC langFortran langTreelang enableMultilib; };
 
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 30b37d5a06a4..f53e9e37847d 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -1736,7 +1736,7 @@ let
     inherit zip unzip zlib boehmgc gettext pkgconfig;
     inherit (gtkLibs) gtk;
     inherit (gnome) libart_lgpl;
-    inherit (xlibs) libX11 libXt libSM libICE libXtst;
+    inherit (xlibs) libX11 libXt libSM libICE libXtst xproto;
   });
 
   #ghc = haskellPackages.ghc;