diff --git a/lib/systems/examples.nix b/lib/systems/examples.nix
index 4edbf4df4b61..77fa60e95379 100644
--- a/lib/systems/examples.nix
+++ b/lib/systems/examples.nix
@@ -305,6 +305,11 @@ rec {
     libc = "msvcrt"; # This distinguishes the mingw (non posix) toolchain
   };
 
+  ucrt64 = {
+    config = "x86_64-w64-mingw32";
+    libc = "ucrt"; # This distinguishes the mingw (non posix) toolchain
+  };
+
   # BSDs
 
   x86_64-freebsd = {
diff --git a/pkgs/development/compilers/gcc/10/default.nix b/pkgs/development/compilers/gcc/10/default.nix
index df1cbdf18983..f45e08439062 100644
--- a/pkgs/development/compilers/gcc/10/default.nix
+++ b/pkgs/development/compilers/gcc/10/default.nix
@@ -77,7 +77,7 @@ let majorVersion = "10";
       });
 
     /* Cross-gcc settings (build == host != target) */
-    crossMingw = targetPlatform != hostPlatform && targetPlatform.libc == "msvcrt";
+    crossMingw = targetPlatform != hostPlatform && targetPlatform.isMinGW;
     stageNameAddon = if crossStageStatic then "stage-static" else "stage-final";
     crossNameAddon = optionalString (targetPlatform != hostPlatform) "${targetPlatform.config}-${stageNameAddon}-";
 
@@ -289,7 +289,7 @@ stdenv.mkDerivation ({
 
 }
 
-// optionalAttrs (targetPlatform != hostPlatform && targetPlatform.libc == "msvcrt" && crossStageStatic) {
+// optionalAttrs (targetPlatform != hostPlatform && targetPlatform.isMinGW && crossStageStatic) {
   makeFlags = [ "all-gcc" "all-target-libgcc" ];
   installTargets = "install-gcc install-target-libgcc";
 }
diff --git a/pkgs/development/compilers/gcc/11/default.nix b/pkgs/development/compilers/gcc/11/default.nix
index 8513f03d2da1..97716ecd88b1 100644
--- a/pkgs/development/compilers/gcc/11/default.nix
+++ b/pkgs/development/compilers/gcc/11/default.nix
@@ -90,7 +90,7 @@ let majorVersion = "11";
       ++ [ ./gcc-issue-103910.patch ];
 
     /* Cross-gcc settings (build == host != target) */
-    crossMingw = targetPlatform != hostPlatform && targetPlatform.libc == "msvcrt";
+    crossMingw = targetPlatform != hostPlatform && targetPlatform.isMinGW;
     stageNameAddon = if crossStageStatic then "stage-static" else "stage-final";
     crossNameAddon = optionalString (targetPlatform != hostPlatform) "${targetPlatform.config}-${stageNameAddon}-";
 
@@ -303,7 +303,7 @@ lib.pipe (stdenv.mkDerivation ({
   };
 }
 
-// optionalAttrs (targetPlatform != hostPlatform && targetPlatform.libc == "msvcrt" && crossStageStatic) {
+// optionalAttrs (targetPlatform != hostPlatform && targetPlatform.isMinGW && crossStageStatic) {
   makeFlags = [ "all-gcc" "all-target-libgcc" ];
   installTargets = "install-gcc install-target-libgcc";
 }
diff --git a/pkgs/development/compilers/gcc/12/default.nix b/pkgs/development/compilers/gcc/12/default.nix
index 92bec39e7216..c20351f32ad9 100644
--- a/pkgs/development/compilers/gcc/12/default.nix
+++ b/pkgs/development/compilers/gcc/12/default.nix
@@ -127,7 +127,7 @@ let majorVersion = "12";
       ++ optional (!crossStageStatic && targetPlatform.isMinGW && threadsCross.model == "mcf") ./Added-mcf-thread-model-support-from-mcfgthread.patch;
 
     /* Cross-gcc settings (build == host != target) */
-    crossMingw = targetPlatform != hostPlatform && targetPlatform.libc == "msvcrt";
+    crossMingw = targetPlatform != hostPlatform && targetPlatform.isMinGW;
     stageNameAddon = if crossStageStatic then "stage-static" else "stage-final";
     crossNameAddon = optionalString (targetPlatform != hostPlatform) "${targetPlatform.config}-${stageNameAddon}-";
 
@@ -344,7 +344,7 @@ lib.pipe (stdenv.mkDerivation ({
   };
 }
 
-// optionalAttrs (targetPlatform != hostPlatform && targetPlatform.libc == "msvcrt" && crossStageStatic) {
+// optionalAttrs (targetPlatform != hostPlatform && targetPlatform.isMinGW && crossStageStatic) {
   makeFlags = [ "all-gcc" "all-target-libgcc" ];
   installTargets = "install-gcc install-target-libgcc";
 }
diff --git a/pkgs/development/compilers/gcc/13/default.nix b/pkgs/development/compilers/gcc/13/default.nix
index 230910c19402..b48e37758f08 100644
--- a/pkgs/development/compilers/gcc/13/default.nix
+++ b/pkgs/development/compilers/gcc/13/default.nix
@@ -126,7 +126,7 @@ let majorVersion = "13";
       ++ optional (!crossStageStatic && targetPlatform.isMinGW && threadsCross.model == "mcf") ./Added-mcf-thread-model-support-from-mcfgthread.patch;
 
     /* Cross-gcc settings (build == host != target) */
-    crossMingw = targetPlatform != hostPlatform && targetPlatform.libc == "msvcrt";
+    crossMingw = targetPlatform != hostPlatform && targetPlatform.isMinGW;
     stageNameAddon = if crossStageStatic then "stage-static" else "stage-final";
     crossNameAddon = optionalString (targetPlatform != hostPlatform) "${targetPlatform.config}-${stageNameAddon}-";
 
@@ -343,7 +343,7 @@ lib.pipe (stdenv.mkDerivation ({
   };
 }
 
-// optionalAttrs (targetPlatform != hostPlatform && targetPlatform.libc == "msvcrt" && crossStageStatic) {
+// optionalAttrs (targetPlatform != hostPlatform && targetPlatform.isMinGW && crossStageStatic) {
   makeFlags = [ "all-gcc" "all-target-libgcc" ];
   installTargets = "install-gcc install-target-libgcc";
 }
diff --git a/pkgs/development/compilers/gcc/4.8/default.nix b/pkgs/development/compilers/gcc/4.8/default.nix
index 90489fd3fb1c..fd69725ec7ec 100644
--- a/pkgs/development/compilers/gcc/4.8/default.nix
+++ b/pkgs/development/compilers/gcc/4.8/default.nix
@@ -108,7 +108,7 @@ let majorVersion = "4";
     javaAwtGtk = langJava && x11Support;
 
     /* Cross-gcc settings (build == host != target) */
-    crossMingw = targetPlatform != hostPlatform && targetPlatform.libc == "msvcrt";
+    crossMingw = targetPlatform != hostPlatform && targetPlatform.isMinGW;
     stageNameAddon = if crossStageStatic then "stage-static" else "stage-final";
     crossNameAddon = optionalString (targetPlatform != hostPlatform) "${targetPlatform.config}-${stageNameAddon}-";
 
@@ -317,7 +317,7 @@ stdenv.mkDerivation ({
   };
 }
 
-// optionalAttrs (targetPlatform != hostPlatform && targetPlatform.libc == "msvcrt" && crossStageStatic) {
+// optionalAttrs (targetPlatform != hostPlatform && targetPlatform.isMinGW && crossStageStatic) {
   makeFlags = [ "all-gcc" "all-target-libgcc" ];
   installTargets = "install-gcc install-target-libgcc";
 }
diff --git a/pkgs/development/compilers/gcc/4.9/default.nix b/pkgs/development/compilers/gcc/4.9/default.nix
index ec0f4cde781d..38f43058b9cf 100644
--- a/pkgs/development/compilers/gcc/4.9/default.nix
+++ b/pkgs/development/compilers/gcc/4.9/default.nix
@@ -125,7 +125,7 @@ let majorVersion = "4";
     javaAwtGtk = langJava && x11Support;
 
     /* Cross-gcc settings (build == host != target) */
-    crossMingw = targetPlatform != hostPlatform && targetPlatform.libc == "msvcrt";
+    crossMingw = targetPlatform != hostPlatform && targetPlatform.isMinGW;
     stageNameAddon = if crossStageStatic then "stage-static" else "stage-final";
     crossNameAddon = optionalString (targetPlatform != hostPlatform) "${targetPlatform.config}-${stageNameAddon}-";
 
@@ -338,7 +338,7 @@ stdenv.mkDerivation ({
   };
 }
 
-// optionalAttrs (targetPlatform != hostPlatform && targetPlatform.libc == "msvcrt" && crossStageStatic) {
+// optionalAttrs (targetPlatform != hostPlatform && targetPlatform.isMinGW && crossStageStatic) {
   makeFlags = [ "all-gcc" "all-target-libgcc" ];
   installTargets = "install-gcc install-target-libgcc";
 }
diff --git a/pkgs/development/compilers/gcc/6/default.nix b/pkgs/development/compilers/gcc/6/default.nix
index 965a987aab35..a89895c0223d 100644
--- a/pkgs/development/compilers/gcc/6/default.nix
+++ b/pkgs/development/compilers/gcc/6/default.nix
@@ -110,7 +110,7 @@ let majorVersion = "6";
     javaAwtGtk = langJava && x11Support;
 
     /* Cross-gcc settings (build == host != target) */
-    crossMingw = targetPlatform != hostPlatform && targetPlatform.libc == "msvcrt";
+    crossMingw = targetPlatform != hostPlatform && targetPlatform.isMinGW;
     stageNameAddon = if crossStageStatic then "stage-static" else "stage-final";
     crossNameAddon = optionalString (targetPlatform != hostPlatform) "${targetPlatform.config}-${stageNameAddon}-";
 
@@ -356,7 +356,7 @@ stdenv.mkDerivation ({
   };
 }
 
-// optionalAttrs (targetPlatform != hostPlatform && targetPlatform.libc == "msvcrt" && crossStageStatic) {
+// optionalAttrs (targetPlatform != hostPlatform && targetPlatform.isMinGW && crossStageStatic) {
   makeFlags = [ "all-gcc" "all-target-libgcc" ];
   installTargets = "install-gcc install-target-libgcc";
 }
diff --git a/pkgs/development/compilers/gcc/7/default.nix b/pkgs/development/compilers/gcc/7/default.nix
index 6ec689ab2524..42dbaef52a88 100644
--- a/pkgs/development/compilers/gcc/7/default.nix
+++ b/pkgs/development/compilers/gcc/7/default.nix
@@ -86,7 +86,7 @@ let majorVersion = "7";
       ++ [ ../libsanitizer-no-cyclades-9.patch ];
 
     /* Cross-gcc settings (build == host != target) */
-    crossMingw = targetPlatform != hostPlatform && targetPlatform.libc == "msvcrt";
+    crossMingw = targetPlatform != hostPlatform && targetPlatform.isMinGW;
     stageNameAddon = if crossStageStatic then "stage-static" else "stage-final";
     crossNameAddon = optionalString (targetPlatform != hostPlatform) "${targetPlatform.config}-${stageNameAddon}-";
 
@@ -296,7 +296,7 @@ stdenv.mkDerivation ({
   };
 }
 
-// optionalAttrs (targetPlatform != hostPlatform && targetPlatform.libc == "msvcrt" && crossStageStatic) {
+// optionalAttrs (targetPlatform != hostPlatform && targetPlatform.isMinGW && crossStageStatic) {
   makeFlags = [ "all-gcc" "all-target-libgcc" ];
   installTargets = "install-gcc install-target-libgcc";
 }
diff --git a/pkgs/development/compilers/gcc/8/default.nix b/pkgs/development/compilers/gcc/8/default.nix
index 1baed9137856..b109f72e421b 100644
--- a/pkgs/development/compilers/gcc/8/default.nix
+++ b/pkgs/development/compilers/gcc/8/default.nix
@@ -67,7 +67,7 @@ let majorVersion = "8";
       ++ [ ../libsanitizer-no-cyclades-9.patch ];
 
     /* Cross-gcc settings (build == host != target) */
-    crossMingw = targetPlatform != hostPlatform && targetPlatform.libc == "msvcrt";
+    crossMingw = targetPlatform != hostPlatform && targetPlatform.isMinGW;
     stageNameAddon = if crossStageStatic then "stage-static" else "stage-final";
     crossNameAddon = optionalString (targetPlatform != hostPlatform) "${targetPlatform.config}-${stageNameAddon}-";
 
@@ -271,7 +271,7 @@ stdenv.mkDerivation ({
   };
 }
 
-// optionalAttrs (targetPlatform != hostPlatform && targetPlatform.libc == "msvcrt" && crossStageStatic) {
+// optionalAttrs (targetPlatform != hostPlatform && targetPlatform.isMinGW && crossStageStatic) {
   makeFlags = [ "all-gcc" "all-target-libgcc" ];
   installTargets = "install-gcc install-target-libgcc";
 }
diff --git a/pkgs/development/compilers/gcc/9/default.nix b/pkgs/development/compilers/gcc/9/default.nix
index aceb912d7a69..80eb24062847 100644
--- a/pkgs/development/compilers/gcc/9/default.nix
+++ b/pkgs/development/compilers/gcc/9/default.nix
@@ -78,7 +78,7 @@ let majorVersion = "9";
       ;
 
     /* Cross-gcc settings (build == host != target) */
-    crossMingw = targetPlatform != hostPlatform && targetPlatform.libc == "msvcrt";
+    crossMingw = targetPlatform != hostPlatform && targetPlatform.isMinGW;
     stageNameAddon = if crossStageStatic then "stage-static" else "stage-final";
     crossNameAddon = optionalString (targetPlatform != hostPlatform) "${targetPlatform.config}-${stageNameAddon}-";
 
@@ -285,7 +285,7 @@ stdenv.mkDerivation ({
   };
 }
 
-// optionalAttrs (targetPlatform != hostPlatform && targetPlatform.libc == "msvcrt" && crossStageStatic) {
+// optionalAttrs (targetPlatform != hostPlatform && targetPlatform.isMinGW && crossStageStatic) {
   makeFlags = [ "all-gcc" "all-target-libgcc" ];
   installTargets = "install-gcc install-target-libgcc";
 }
diff --git a/pkgs/development/compilers/gcc/common/configure-flags.nix b/pkgs/development/compilers/gcc/common/configure-flags.nix
index aa8ecc62e55a..6e5a2f206e04 100644
--- a/pkgs/development/compilers/gcc/common/configure-flags.nix
+++ b/pkgs/development/compilers/gcc/common/configure-flags.nix
@@ -47,7 +47,7 @@ let
   # See https://github.com/NixOS/nixpkgs/pull/209870#issuecomment-1500550903
   disableBootstrap' = disableBootstrap && !langFortran && !langGo;
 
-  crossMingw = targetPlatform != hostPlatform && targetPlatform.libc == "msvcrt";
+  crossMingw = targetPlatform != hostPlatform && targetPlatform.isMinGW;
   crossDarwin = targetPlatform != hostPlatform && targetPlatform.libc == "libSystem";
 
   targetPrefix = lib.optionalString (stdenv.targetPlatform != stdenv.hostPlatform)
diff --git a/pkgs/development/libraries/boost/generic.nix b/pkgs/development/libraries/boost/generic.nix
index 7d8aee067c86..f61c25b29386 100644
--- a/pkgs/development/libraries/boost/generic.nix
+++ b/pkgs/development/libraries/boost/generic.nix
@@ -9,7 +9,7 @@
 , enableDebug ? false
 , enableSingleThreaded ? false
 , enableMultiThreaded ? true
-, enableShared ? !(with stdenv.hostPlatform; isStatic || libc == "msvcrt") # problems for now
+, enableShared ? !(with stdenv.hostPlatform; isStatic || isMinGW) # problems for now
 , enableStatic ? !enableShared
 , enablePython ? false
 , enableNumpy ? false
@@ -91,7 +91,7 @@ let
     ++ lib.optional (!enablePython) "--without-python"
     ++ lib.optional needUserConfig "--user-config=user-config.jam"
     ++ lib.optional (stdenv.buildPlatform.isDarwin && stdenv.hostPlatform.isLinux) "pch=off"
-    ++ lib.optionals (stdenv.hostPlatform.libc == "msvcrt") [
+    ++ lib.optionals stdenv.hostPlatform.isMinGW [
     "threadapi=win32"
   ] ++ extraB2Args
   );
@@ -240,7 +240,7 @@ stdenv.mkDerivation {
     # Make boost header paths relative so that they are not runtime dependencies
     cd "$dev" && find include \( -name '*.hpp' -or -name '*.h' -or -name '*.ipp' \) \
       -exec sed '1s/^\xef\xbb\xbf//;1i#line 1 "{}"' -i '{}' \;
-  '' + lib.optionalString (stdenv.hostPlatform.libc == "msvcrt") ''
+  '' + lib.optionalString stdenv.hostPlatform.isMinGW ''
     $RANLIB "$out/lib/"*.a
   '';
 
diff --git a/pkgs/development/libraries/libiconv/default.nix b/pkgs/development/libraries/libiconv/default.nix
index a6481970ef27..c91cd78f16f9 100644
--- a/pkgs/development/libraries/libiconv/default.nix
+++ b/pkgs/development/libraries/libiconv/default.nix
@@ -22,7 +22,7 @@ stdenv.mkDerivation rec {
   ];
 
   postPatch =
-    lib.optionalString ((stdenv.hostPlatform != stdenv.buildPlatform && stdenv.hostPlatform.libc == "msvcrt") || stdenv.cc.nativeLibc)
+    lib.optionalString ((stdenv.hostPlatform != stdenv.buildPlatform && stdenv.hostPlatform.isMinGW) || stdenv.cc.nativeLibc)
       ''
         sed '/^_GL_WARN_ON_USE (gets/d' -i srclib/stdio.in.h
       ''
diff --git a/pkgs/development/libraries/libjpeg-turbo/default.nix b/pkgs/development/libraries/libjpeg-turbo/default.nix
index b6902050b5d5..27d4fda2ddc6 100644
--- a/pkgs/development/libraries/libjpeg-turbo/default.nix
+++ b/pkgs/development/libraries/libjpeg-turbo/default.nix
@@ -42,7 +42,7 @@ stdenv.mkDerivation rec {
 
   # This is needed by freeimage
   patches = [ ./0001-Compile-transupp.c-as-part-of-the-library.patch ]
-    ++ lib.optional (stdenv.hostPlatform.libc or null == "msvcrt")
+    ++ lib.optional stdenv.hostPlatform.isMinGW
     ./mingw-boolean.patch;
 
   outputs = [ "bin" "dev" "dev_private" "out" "man" "doc" ];
diff --git a/pkgs/development/libraries/libxml2/default.nix b/pkgs/development/libraries/libxml2/default.nix
index d59a3a73757b..8e3e97d74206 100644
--- a/pkgs/development/libraries/libxml2/default.nix
+++ b/pkgs/development/libraries/libxml2/default.nix
@@ -17,7 +17,7 @@
     (stdenv.hostPlatform == stdenv.buildPlatform || stdenv.hostPlatform.isCygwin || stdenv.hostPlatform.isLinux || stdenv.hostPlatform.isWasi)
 , icuSupport ? false
 , icu
-, enableShared ? stdenv.hostPlatform.libc != "msvcrt" && !stdenv.hostPlatform.isStatic
+, enableShared ? !stdenv.hostPlatform.isMinGW && !stdenv.hostPlatform.isStatic
 , enableStatic ? !enableShared
 , gnome
 }:
diff --git a/pkgs/development/libraries/zlib/default.nix b/pkgs/development/libraries/zlib/default.nix
index 051a55df8e49..baef243cbdc6 100644
--- a/pkgs/development/libraries/zlib/default.nix
+++ b/pkgs/development/libraries/zlib/default.nix
@@ -51,7 +51,7 @@ stdenv.mkDerivation (finalAttrs: {
   setOutputFlags = false;
   outputDoc = "dev"; # single tiny man3 page
 
-  dontConfigure = stdenv.hostPlatform.libc == "msvcrt";
+  dontConfigure = stdenv.hostPlatform.isMinGW;
 
   preConfigure = lib.optionalString (stdenv.hostPlatform != stdenv.buildPlatform) ''
     export CHOST=${stdenv.hostPlatform.config}
@@ -96,7 +96,7 @@ stdenv.mkDerivation (finalAttrs: {
   ''
     # Non-typical naming confuses libtool which then refuses to use zlib's DLL
     # in some cases, e.g. when compiling libpng.
-  + lib.optionalString (stdenv.hostPlatform.libc == "msvcrt" && shared) ''
+  + lib.optionalString (stdenv.hostPlatform.isMinGW && shared) ''
     ln -s zlib1.dll $out/bin/libz.dll
   '';
 
@@ -109,7 +109,7 @@ stdenv.mkDerivation (finalAttrs: {
   dontStrip = stdenv.hostPlatform != stdenv.buildPlatform && static;
   configurePlatforms = [];
 
-  installFlags = lib.optionals (stdenv.hostPlatform.libc == "msvcrt") [
+  installFlags = lib.optionals stdenv.hostPlatform.isMinGW [
     "BINARY_PATH=$(out)/bin"
     "INCLUDE_PATH=$(dev)/include"
     "LIBRARY_PATH=$(out)/lib"
@@ -120,7 +120,7 @@ stdenv.mkDerivation (finalAttrs: {
 
   makeFlags = [
     "PREFIX=${stdenv.cc.targetPrefix}"
-  ] ++ lib.optionals (stdenv.hostPlatform.libc == "msvcrt") [
+  ] ++ lib.optionals stdenv.hostPlatform.isMinGW [
     "-f" "win32/Makefile.gcc"
   ] ++ lib.optionals shared [
     # Note that as of writing (zlib 1.2.11), this flag only has an effect
diff --git a/pkgs/os-specific/windows/mingw-w64/default.nix b/pkgs/os-specific/windows/mingw-w64/default.nix
index 221bcd8e89f2..3bfc7a58e727 100644
--- a/pkgs/os-specific/windows/mingw-w64/default.nix
+++ b/pkgs/os-specific/windows/mingw-w64/default.nix
@@ -36,6 +36,8 @@ in stdenv.mkDerivation {
   configureFlags = [
     "--enable-idl"
     "--enable-secure-api"
+  ] ++ lib.optionals (stdenv.targetPlatform.libc == "ucrt") [
+    "--with-default-msvcrt=ucrt"
   ];
 
   enableParallelBuilding = true;
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 502655966ea8..cba6de92422f 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -20689,7 +20689,7 @@ with pkgs;
   # These are used when buiding compiler-rt / libgcc, prior to building libc.
   preLibcCrossHeaders = let
     inherit (stdenv.targetPlatform) libc;
-  in     if libc == "msvcrt" then targetPackages.windows.mingw_w64_headers or windows.mingw_w64_headers
+  in     if stdenv.targetPlatform.isMinGW then targetPackages.windows.mingw_w64_headers or windows.mingw_w64_headers
     else if libc == "nblibc" then targetPackages.netbsdCross.headers or netbsdCross.headers
     else if libc == "libSystem" && stdenv.targetPlatform.isAarch64 then targetPackages.darwin.LibsystemCross or darwin.LibsystemCross
     else null;
@@ -20710,6 +20710,7 @@ with pkgs;
     else if name == "newlib-nano" then targetPackages.newlib-nanoCross or newlib-nanoCross
     else if name == "musl" then targetPackages.muslCross or muslCross
     else if name == "msvcrt" then targetPackages.windows.mingw_w64 or windows.mingw_w64
+    else if name == "ucrt" then targetPackages.windows.mingw_w64 or windows.mingw_w64
     else if name == "libSystem" then
       if stdenv.targetPlatform.useiOSPrebuilt
       then targetPackages.darwin.iosSdkPkgs.libraries or darwin.iosSdkPkgs.libraries