diff --git a/pkgs/applications/misc/gkrellm/default.nix b/pkgs/applications/misc/gkrellm/default.nix
index 934a7c69c99..ac8f876ad3f 100644
--- a/pkgs/applications/misc/gkrellm/default.nix
+++ b/pkgs/applications/misc/gkrellm/default.nix
@@ -15,7 +15,7 @@ stdenv.mkDerivation rec {
      echo "patching makefiles..."
      for i in Makefile src/Makefile server/Makefile
      do
-       sed -i "$i" -e "s|/usr/X11R6|${libX11}|g ; s|-lICE|-lX11 -lICE|g"
+       sed -i "$i" -e "s|/usr/X11R6|${libX11.dev}|g ; s|-lICE|-lX11 -lICE|g"
      done '';
 
   buildPhase = ''
diff --git a/pkgs/games/0ad/default.nix b/pkgs/games/0ad/default.nix
index 485feb53a89..1b9dbbc48a4 100644
--- a/pkgs/games/0ad/default.nix
+++ b/pkgs/games/0ad/default.nix
@@ -37,7 +37,7 @@ stdenv.mkDerivation rec {
 
   NIX_CFLAGS_COMPILE = [
     "-I${xproto}/include/X11"
-    "-I${libX11}/include/X11"
+    "-I${libX11.dev}/include/X11"
     "-I${libXcursor}/include/X11"
     "-I${SDL}/include/SDL"
     "-I${SDL2}/include/SDL2"
diff --git a/pkgs/misc/emulators/wxmupen64plus/default.nix b/pkgs/misc/emulators/wxmupen64plus/default.nix
index 0366b9dd22c..aec498b899e 100644
--- a/pkgs/misc/emulators/wxmupen64plus/default.nix
+++ b/pkgs/misc/emulators/wxmupen64plus/default.nix
@@ -12,7 +12,7 @@ stdenv.mkDerivation {
   configurePhase = ''
     tar xf ${mupen64plus.src}
     APIDIR=$(eval echo `pwd`/mupen64plus*/source/mupen64plus-core/src/api)
-    export CXXFLAGS="-I${libX11}/include/X11 -DLIBDIR=\\\"${mupen64plus}/lib/\\\""
+    export CXXFLAGS="-I${libX11.dev}/include/X11 -DLIBDIR=\\\"${mupen64plus}/lib/\\\""
     export LDFLAGS="-lwx_gtk2u_adv-2.9"
     python waf configure --mupenapi=$APIDIR --wxconfig=`type -P wx-config` --prefix=$out
   '';