diff --git a/pkgs/development/tools/glslviewer/default.nix b/pkgs/development/tools/glslviewer/default.nix
index fcebe93aaa2..06016bec25b 100644
--- a/pkgs/development/tools/glslviewer/default.nix
+++ b/pkgs/development/tools/glslviewer/default.nix
@@ -15,6 +15,10 @@ stdenv.mkDerivation rec {
     sha256 = "0v7x93b61ama0gmzlx1zc56jgi7bvzsfvbkfl82xzwf2h5g1zni7";
   };
 
+  postPatch = ''
+    sed '1i#include <cstring>' -i src/tools/text.cpp # gcc12
+  '';
+
   nativeBuildInputs = [ pkg-config ensureNewerSourcesForZipFilesHook python3Packages.six ];
   buildInputs = [
     glfw libGLU glfw libXrandr libXdamage
diff --git a/pkgs/tools/text/tab/default.nix b/pkgs/tools/text/tab/default.nix
index 0802f7b9836..0ddd7509c9f 100644
--- a/pkgs/tools/text/tab/default.nix
+++ b/pkgs/tools/text/tab/default.nix
@@ -11,6 +11,11 @@ stdenv.mkDerivation rec {
     sha256 = "sha256-AhgWeV/ojB8jM16A5ggrOD1YjWfRVcoQbkd3S2bgdyE=";
   };
 
+  # gcc12; see https://github.com/ivan-tkatchev/tab/commit/673bdac998
+  postPatch = ''
+    sed '1i#include <cstring>' -i deps.h
+  '';
+
   nativeCheckInputs = [ python3 ];
 
   doCheck = !stdenv.isDarwin;