diff --git a/pkgs/development/compilers/gcc/common/dependencies.nix b/pkgs/development/compilers/gcc/common/dependencies.nix
index a38cdcb9e20f5..57d87d29d649d 100644
--- a/pkgs/development/compilers/gcc/common/dependencies.nix
+++ b/pkgs/development/compilers/gcc/common/dependencies.nix
@@ -50,7 +50,7 @@ in
   ]
   ++ optionals (perl != null) [ perl ]
   ++ optionals javaAwtGtk [ pkg-config ]
-  ++ optionals (with stdenv.targetPlatform; isVc4 || isRedox && flex != null) [ flex ]
+  ++ optionals (lib.versionAtLeast version "14" || (with stdenv.targetPlatform; isVc4 || isRedox && flex != null)) [ flex ]
   ++ optionals langAda [ gnat-bootstrap ]
   # The builder relies on GNU sed (for instance, Darwin's `sed' fails with
   # "-i may not be used with stdin"), and `stdenvNative' doesn't provide it.
diff --git a/pkgs/development/compilers/gcc/default.nix b/pkgs/development/compilers/gcc/default.nix
index 0144ab4cfff9b..cad5006ccff2d 100644
--- a/pkgs/development/compilers/gcc/default.nix
+++ b/pkgs/development/compilers/gcc/default.nix
@@ -52,6 +52,7 @@ let
   version = versions.fromMajorMinor majorMinorVersion;
 
   majorVersion = lib.versions.major version;
+  atLeast14 = lib.versionAtLeast version "14";
   atLeast13 = lib.versionAtLeast version "13";
   atLeast12 = lib.versionAtLeast version "12";
   atLeast11 = lib.versionAtLeast version "11";
@@ -61,6 +62,7 @@ let
   atLeast7  = lib.versionAtLeast version  "7";
   atLeast6  = lib.versionAtLeast version  "6";
   atLeast49 = lib.versionAtLeast version  "4.9";
+  is14 = majorVersion == "14";
   is13 = majorVersion == "13";
   is12 = majorVersion == "12";
   is11 = majorVersion == "11";
@@ -221,6 +223,8 @@ let inherit version;
         url = "https://www.antlr.org/download/antlr-4.4-complete.jar";
         sha256 = "02lda2imivsvsis8rnzmbrbp8rh1kb8vmq4i67pqhkwz7lf8y6dz";
       };
+    } // lib.optionalAttrs atLeast14 {
+      inherit flex;
     });
 
 in
diff --git a/pkgs/development/compilers/gcc/patches/default.nix b/pkgs/development/compilers/gcc/patches/default.nix
index 8f0c8f6d288c8..9d260cb81e9b6 100644
--- a/pkgs/development/compilers/gcc/patches/default.nix
+++ b/pkgs/development/compilers/gcc/patches/default.nix
@@ -63,6 +63,7 @@ in
 ++ optionals (noSysDirs) (
   [(if atLeast12 then ./gcc-12-no-sys-dirs.patch else ./no-sys-dirs.patch)] ++
   ({
+    "14" = [ ./13/no-sys-dirs-riscv.patch ./13/mangle-NIX_STORE-in-__FILE__.patch ];
     "13" = [ ./13/no-sys-dirs-riscv.patch ./13/mangle-NIX_STORE-in-__FILE__.patch ];
     "12" = [ ./no-sys-dirs-riscv.patch ./12/mangle-NIX_STORE-in-__FILE__.patch ];
     "11" = [ ./no-sys-dirs-riscv.patch ];