diff --git a/pkgs/development/libraries/qt-5/5.5/qtbase/default.nix b/pkgs/development/libraries/qt-5/5.5/qtbase/default.nix
index d36a7ef8273..138faf86506 100644
--- a/pkgs/development/libraries/qt-5/5.5/qtbase/default.nix
+++ b/pkgs/development/libraries/qt-5/5.5/qtbase/default.nix
@@ -7,7 +7,7 @@
 , openssl, dbus, glib, udev, libxml2, libxslt, pcre16
 , zlib, libjpeg, libpng, libtiff, sqlite, icu
 
-, coreutils, bison, flex, gdb, gperf, lndir, ruby
+, coreutils, bison, flex, gdb, gperf, lndir
 , patchelf, perl, pkgconfig, python
 
 # optional dependencies
@@ -205,7 +205,7 @@ stdenv.mkDerivation {
   ++ lib.optional mesaSupported mesa;
 
   buildInputs =
-    [ bison flex gperf ruby ]
+    [ bison flex gperf ]
     ++ lib.optional developerBuild gdb
     ++ lib.optional (cups != null) cups
     ++ lib.optional (mysql != null) mysql.lib
@@ -256,7 +256,7 @@ stdenv.mkDerivation {
 
   postFixup =
     ''
-      # Don't retain build-time dependencies like gdb and ruby.
+      # Don't retain build-time dependencies like gdb.
       sed '/QMAKE_DEFAULT_.*DIRS/ d' -i $dev/mkspecs/qconfig.pri
 
       # Move libtool archives and qmake projects
diff --git a/pkgs/development/libraries/qt-5/5.6/qtbase/default.nix b/pkgs/development/libraries/qt-5/5.6/qtbase/default.nix
index 2f414efc314..25e94c44ad2 100644
--- a/pkgs/development/libraries/qt-5/5.6/qtbase/default.nix
+++ b/pkgs/development/libraries/qt-5/5.6/qtbase/default.nix
@@ -7,7 +7,7 @@
 , openssl, dbus, glib, udev, libxml2, libxslt, pcre16
 , zlib, libjpeg, libpng, libtiff, sqlite, icu
 
-, coreutils, bison, flex, gdb, gperf, lndir, ruby
+, coreutils, bison, flex, gdb, gperf, lndir
 , patchelf, perl, pkgconfig, python
 
 # optional dependencies
@@ -180,7 +180,7 @@ stdenv.mkDerivation {
   ++ lib.optional mesaSupported mesa;
 
   buildInputs =
-    [ bison flex gperf ruby ]
+    [ bison flex gperf ]
     ++ lib.optional developerBuild gdb
     ++ lib.optional (cups != null) cups
     ++ lib.optional (mysql != null) mysql.lib
@@ -213,7 +213,7 @@ stdenv.mkDerivation {
 
   postFixup =
     ''
-      # Don't retain build-time dependencies like gdb and ruby.
+      # Don't retain build-time dependencies like gdb.
       sed '/QMAKE_DEFAULT_.*DIRS/ d' -i $dev/mkspecs/qconfig.pri
 
       # Move libtool archives and qmake projects
diff --git a/pkgs/development/libraries/qt-5/5.7/qtbase/default.nix b/pkgs/development/libraries/qt-5/5.7/qtbase/default.nix
index a31452e6d9b..81d0e446f2a 100644
--- a/pkgs/development/libraries/qt-5/5.7/qtbase/default.nix
+++ b/pkgs/development/libraries/qt-5/5.7/qtbase/default.nix
@@ -189,7 +189,7 @@ stdenv.mkDerivation {
     ++ lib.optional (postgresql != null) postgresql;
 
   nativeBuildInputs =
-    [ bison flex gperf lndir patchelf perl pkgconfig python ruby ];
+    [ bison flex gperf lndir patchelf perl pkgconfig python ];
 
   # freetype-2.5.4 changed signedness of some struct fields
   NIX_CFLAGS_COMPILE = "-Wno-error=sign-compare";
@@ -216,7 +216,7 @@ stdenv.mkDerivation {
 
   postFixup =
     ''
-      # Don't retain build-time dependencies like gdb and ruby.
+      # Don't retain build-time dependencies like gdb.
       sed '/QMAKE_DEFAULT_.*DIRS/ d' -i $dev/mkspecs/qconfig.pri
 
       # Move libtool archives and qmake projects