diff --git a/pkgs/applications/audio/bespokesynth/default.nix b/pkgs/applications/audio/bespokesynth/default.nix
index 6c48c756ab24..7fc921e59fbf 100644
--- a/pkgs/applications/audio/bespokesynth/default.nix
+++ b/pkgs/applications/audio/bespokesynth/default.nix
@@ -66,6 +66,10 @@ stdenv.mkDerivation rec {
     fetchSubmodules = true;
   };
 
+  postPatch = ''
+    sed '1i#include <memory>' -i Source/TitleBar.h # gcc12
+  '';
+
   cmakeBuildType = "Release";
 
   cmakeFlags = lib.optionals enableVST2 [ "-DBESPOKE_VST2_SDK_LOCATION=${vst-sdk}/VST2_SDK" ];
diff --git a/pkgs/applications/audio/stochas/default.nix b/pkgs/applications/audio/stochas/default.nix
index 84376a1bbe9e..2b72664347e6 100644
--- a/pkgs/applications/audio/stochas/default.nix
+++ b/pkgs/applications/audio/stochas/default.nix
@@ -12,6 +12,11 @@ stdenv.mkDerivation rec {
     fetchSubmodules = true;
   };
 
+  postPatch = ''
+    sed '1i#include <utility>' -i \
+      lib/JUCE/modules/juce_gui_basics/windows/juce_ComponentPeer.h # gcc12
+  '';
+
   nativeBuildInputs = [ cmake pkg-config ];
 
   buildInputs = [
diff --git a/pkgs/applications/office/gnucash/default.nix b/pkgs/applications/office/gnucash/default.nix
index 700a94429964..f9e9ec57704c 100644
--- a/pkgs/applications/office/gnucash/default.nix
+++ b/pkgs/applications/office/gnucash/default.nix
@@ -80,6 +80,11 @@ stdenv.mkDerivation rec {
   # guile warning
   GUILE_AUTO_COMPILE="0";
 
+  NIX_CFLAGS_COMPILE = lib.optionals (stdenv.cc.isGNU && lib.versionAtLeast stdenv.cc.version "12") [
+    # Needed with GCC 12 but breaks on darwin (with clang) or older gcc
+    "-Wno-error=use-after-free"
+  ];
+
   # `make check` target does not define its prerequisites but expects them to
   # have already been built.  The list of targets below was built through trial
   # and error based on failing tests.
diff --git a/pkgs/applications/plasma-mobile/angelfish.nix b/pkgs/applications/plasma-mobile/angelfish.nix
index 8158e4d6ea6e..036cf54173ee 100644
--- a/pkgs/applications/plasma-mobile/angelfish.nix
+++ b/pkgs/applications/plasma-mobile/angelfish.nix
@@ -3,7 +3,7 @@
 , cmake
 , corrosion
 , extra-cmake-modules
-, gcc11
+, gcc12
 , kconfig
 , kcoreaddons
 , kdbusaddons
@@ -45,7 +45,7 @@ mkDerivation rec {
     cmake
     corrosion
     extra-cmake-modules
-    gcc11 # doesn't build with GCC 9 from stdenv on aarch64
+    gcc12 # doesn't build with GCC 9 from stdenv on aarch64
   ] ++ (with rustPlatform; [
     cargoSetupHook
     rust.cargo
diff --git a/pkgs/applications/plasma-mobile/audiotube.nix b/pkgs/applications/plasma-mobile/audiotube.nix
index cb87fe0ed24d..14bfc6d18917 100644
--- a/pkgs/applications/plasma-mobile/audiotube.nix
+++ b/pkgs/applications/plasma-mobile/audiotube.nix
@@ -2,7 +2,7 @@
 , mkDerivation
 
 , extra-cmake-modules
-, gcc11
+, gcc12
 , wrapGAppsHook
 
 , gst_all_1
@@ -22,7 +22,7 @@ mkDerivation rec {
   nativeBuildInputs = [
     extra-cmake-modules
     wrapGAppsHook
-    gcc11 # doesn't build with GCC 9 from stdenv on aarch64
+    gcc12 # doesn't build with GCC 9 from stdenv on aarch64
     python3Packages.wrapPython
     python3Packages.pybind11
   ];
diff --git a/pkgs/applications/science/logic/cbmc/default.nix b/pkgs/applications/science/logic/cbmc/default.nix
index 7f15a5f8809a..718022b36ef2 100644
--- a/pkgs/applications/science/logic/cbmc/default.nix
+++ b/pkgs/applications/science/logic/cbmc/default.nix
@@ -60,8 +60,8 @@ stdenv.mkDerivation rec {
       --prefix PATH : "$out/share/cbmc" \
   '';
 
-  NIX_CFLAGS_COMPILE = [
-    # Needed with GCC 12
+  NIX_CFLAGS_COMPILE = lib.optionals stdenv.cc.isGNU [
+    # Needed with GCC 12 but breaks on darwin (with clang)
     "-Wno-error=maybe-uninitialized"
   ] ++ lib.optionals stdenv.cc.isClang [
     # fix "argument unused during compilation"
diff --git a/pkgs/applications/window-managers/cardboard/default.nix b/pkgs/applications/window-managers/cardboard/default.nix
index 5347b0961a54..6e483a40ef51 100644
--- a/pkgs/applications/window-managers/cardboard/default.nix
+++ b/pkgs/applications/window-managers/cardboard/default.nix
@@ -99,6 +99,8 @@ stdenv.mkDerivation rec {
      cp -r ${expected-wrap} ${expected-wrap.name}
      cp -r ${wlroots-wrap} ${wlroots-wrap.name}
     )
+
+    sed '1i#include <functional>' -i cardboard/ViewAnimation.h # gcc12
   '';
 
   # "Inherited" from Nixpkgs expression for wlroots
@@ -108,6 +110,8 @@ stdenv.mkDerivation rec {
     "-Dwlroots:libseat=disabled"
   ];
 
+  NIX_CFLAGS_COMPILE = [ "-Wno-error=array-bounds" ]; # gcc12
+
   meta = with lib; {
     homepage = "https://gitlab.com/cardboardwm/cardboard";
     description = "A scrollable, tiling Wayland compositor inspired on PaperWM";
diff --git a/pkgs/development/tools/misc/edb/default.nix b/pkgs/development/tools/misc/edb/default.nix
index ec65ca62fa30..2203863264f3 100644
--- a/pkgs/development/tools/misc/edb/default.nix
+++ b/pkgs/development/tools/misc/edb/default.nix
@@ -30,6 +30,8 @@ mkDerivation rec {
 
     # Change default optional terminal program path to one that is more likely to work on NixOS.
     substituteInPlace ./src/Configuration.cpp --replace "/usr/bin/xterm" "xterm";
+
+    sed '1i#include <memory>' -i include/{RegisterViewModelBase,State,IState}.h # gcc12
   '';
 
   meta = with lib; {
diff --git a/pkgs/games/openmw/default.nix b/pkgs/games/openmw/default.nix
index 389f59f91a6a..8df88c92ff1c 100644
--- a/pkgs/games/openmw/default.nix
+++ b/pkgs/games/openmw/default.nix
@@ -63,6 +63,10 @@ mkDerivation rec {
     })
   ];
 
+  postPatch = ''
+    sed '1i#include <memory>' -i components/myguiplatform/myguidatamanager.cpp # gcc12
+  '';
+
   nativeBuildInputs = [ cmake pkg-config wrapQtAppsHook ];
 
   buildInputs = [
diff --git a/pkgs/games/stepmania/default.nix b/pkgs/games/stepmania/default.nix
index 2445ee9096c9..6cb7a23dff5f 100644
--- a/pkgs/games/stepmania/default.nix
+++ b/pkgs/games/stepmania/default.nix
@@ -18,6 +18,10 @@ stdenv.mkDerivation rec {
     ./0001-fix-build-with-ffmpeg-4.patch
   ];
 
+  postPatch = ''
+    sed '1i#include <ctime>' -i src/arch/ArchHooks/ArchHooks.h # gcc12
+  '';
+
   nativeBuildInputs = [ cmake nasm ];
 
   buildInputs = [
diff --git a/pkgs/games/supertux/default.nix b/pkgs/games/supertux/default.nix
index 679500f974c3..857617bc4bfa 100644
--- a/pkgs/games/supertux/default.nix
+++ b/pkgs/games/supertux/default.nix
@@ -29,6 +29,10 @@ stdenv.mkDerivation rec {
     sha256 = "1xkr3ka2sxp5s0spp84iv294i29s1vxqzazb6kmjc0n415h0x57p";
   };
 
+  postPatch = ''
+    sed '1i#include <memory>' -i external/partio_zip/zip_manager.hpp # gcc12
+  '';
+
   nativeBuildInputs = [ pkg-config cmake ];
 
   buildInputs = [
diff --git a/pkgs/os-specific/linux/ocf-resource-agents/default.nix b/pkgs/os-specific/linux/ocf-resource-agents/default.nix
index 8d7f2b527144..976c5f1779d7 100644
--- a/pkgs/os-specific/linux/ocf-resource-agents/default.nix
+++ b/pkgs/os-specific/linux/ocf-resource-agents/default.nix
@@ -42,6 +42,11 @@ let
       python3
     ];
 
+    NIX_CFLAGS_COMPILE = lib.optionals (stdenv.cc.isGNU && lib.versionAtLeast stdenv.cc.version "12") [
+      # Needed with GCC 12 but breaks on darwin (with clang) or older gcc
+      "-Wno-error=maybe-uninitialized"
+    ];
+
     meta = with lib; {
       homepage = "https://github.com/ClusterLabs/resource-agents";
       description = "Combined repository of OCF agents from the RHCS and Linux-HA projects";
diff --git a/pkgs/os-specific/linux/projecteur/default.nix b/pkgs/os-specific/linux/projecteur/default.nix
index 63de7453935c..ecb0fe535d35 100644
--- a/pkgs/os-specific/linux/projecteur/default.nix
+++ b/pkgs/os-specific/linux/projecteur/default.nix
@@ -13,6 +13,10 @@ mkDerivation rec {
     sha256 = "sha256-kg6oYtJ4H5A6RNATBg+XvMfCb9FlhEBFjfxamGosMQg=";
   };
 
+  postPatch = ''
+    sed '1i#include <array>' -i src/device.h # gcc12
+  '';
+
   buildInputs = [ qtbase qtgraphicaleffects ];
   nativeBuildInputs = [ wrapQtAppsHook cmake pkg-config ];
 
diff --git a/pkgs/tools/misc/yafetch/default.nix b/pkgs/tools/misc/yafetch/default.nix
index f55926d0ae39..4ebaea963c29 100644
--- a/pkgs/tools/misc/yafetch/default.nix
+++ b/pkgs/tools/misc/yafetch/default.nix
@@ -15,6 +15,8 @@ stdenv.mkDerivation rec {
   prePatch = ''
     substituteInPlace ./config.h --replace \
       "#include \"ascii/gnu.h\"" "#include \"ascii/nixos.h\""
+
+    sed '1i#include <array>' -i config.h # gcc12
   '';
 
   # Fixes installation path
diff --git a/pkgs/tools/networking/ip2unix/default.nix b/pkgs/tools/networking/ip2unix/default.nix
index c4c03cae3a7f..fabbbb40e7a7 100644
--- a/pkgs/tools/networking/ip2unix/default.nix
+++ b/pkgs/tools/networking/ip2unix/default.nix
@@ -14,6 +14,10 @@ stdenv.mkDerivation rec {
     sha256 = "1pl8ayadxb0zzh5s26yschkjhr1xffbzzv347m88f9y0jv34d24r";
   };
 
+  postPatch = ''
+    sed '1i#include <array>' -i src/dynports/dynports.cc # gcc12
+  '';
+
   nativeBuildInputs = [
     meson ninja pkg-config asciidoc libxslt.bin docbook_xml_dtd_45 docbook_xsl
     libxml2.bin docbook5 python3Packages.pytest python3Packages.pytest-timeout
diff --git a/pkgs/tools/networking/uqmi/default.nix b/pkgs/tools/networking/uqmi/default.nix
index 93be3b78cee1..067bc51854ad 100644
--- a/pkgs/tools/networking/uqmi/default.nix
+++ b/pkgs/tools/networking/uqmi/default.nix
@@ -18,8 +18,8 @@ stdenv.mkDerivation {
   nativeBuildInputs = [ cmake perl ];
   buildInputs = [ libubox json_c ];
 
-  NIX_CFLAGS_COMPILE = [
-    # Needed with GCC 12
+  NIX_CFLAGS_COMPILE = lib.optionals (stdenv.cc.isGNU && lib.versionAtLeast stdenv.cc.version "12") [
+    # Needed with GCC 12 but breaks on darwin (with clang) or older gcc
     "-Wno-error=dangling-pointer"
   ];
 
diff --git a/pkgs/tools/text/justify/default.nix b/pkgs/tools/text/justify/default.nix
index 1e18e22db8e2..86de7365663e 100644
--- a/pkgs/tools/text/justify/default.nix
+++ b/pkgs/tools/text/justify/default.nix
@@ -16,6 +16,10 @@ stdenv.mkDerivation rec {
     sha256 = "sha256-406OhJt2Ila/LIhfqJXhbFqFxJJiRyMVI4/VK8Y43kc=";
   };
 
+  postPatch = ''
+    sed '1i#include <algorithm>' -i src/stringHelper.h # gcc12
+  '';
+
   nativeBuildInputs = [ cmake ];
 
   installPhase = ''
diff --git a/pkgs/tools/text/qgrep/default.nix b/pkgs/tools/text/qgrep/default.nix
index 20c85e76e160..4145ec656d20 100644
--- a/pkgs/tools/text/qgrep/default.nix
+++ b/pkgs/tools/text/qgrep/default.nix
@@ -21,8 +21,8 @@ stdenv.mkDerivation rec {
 
   buildInputs = lib.optionals stdenv.isDarwin [ CoreServices CoreFoundation ];
 
-  NIX_CFLAGS_COMPILE = [
-    # Needed with GCC 12
+  NIX_CFLAGS_COMPILE = lib.optionals (stdenv.cc.isGNU && lib.versionAtLeast stdenv.cc.version "12") [
+    # Needed with GCC 12 but breaks on darwin (with clang) or older gcc
     "-Wno-error=mismatched-new-delete"
   ];
 
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 760cfa4e56ab..cf8288b203c6 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -2532,7 +2532,7 @@ with pkgs;
 
   writefreely = callPackage ../applications/misc/writefreely { };
 
-  iqueue = callPackage ../development/libraries/iqueue { stdenv = gcc10StdenvCompat; };
+  iqueue = callPackage ../development/libraries/iqueue { };
 
   lifecycled = callPackage ../tools/misc/lifecycled { };
 
@@ -15237,7 +15237,7 @@ with pkgs;
   mitama-cpp-result = callPackage ../development/libraries/mitama-cpp-result { };
 
   mitscheme = callPackage ../development/compilers/mit-scheme
-    { stdenv = gcc10StdenvCompat; texLive = texlive.combine { inherit (texlive) scheme-small epsf texinfo; }; };
+    { texLive = texlive.combine { inherit (texlive) scheme-small epsf texinfo; }; };
 
   mitschemeX11 = mitscheme.override {
     enableX11 = true;
@@ -17497,6 +17497,7 @@ with pkgs;
 
   libgcc = callPackage ../development/libraries/gcc/libgcc {
     stdenvNoLibs = gccStdenvNoLibs; # cannot be built with clang it seems
+    gcc = gcc11; # fails to build with gcc12
   };
 
   # This is for e.g. LLVM libraries on linux.