diff --git a/pkgs/applications/misc/prusa-slicer/default.nix b/pkgs/applications/misc/prusa-slicer/default.nix
index 830601e189cf..6309889d9d91 100644
--- a/pkgs/applications/misc/prusa-slicer/default.nix
+++ b/pkgs/applications/misc/prusa-slicer/default.nix
@@ -145,14 +145,17 @@ stdenv.mkDerivation (finalAttrs: {
 
   doInstallCheck = true;
 
-  # The build system uses custom logic - defined in
-  # cmake/modules/FindNLopt.cmake in the package source - for finding the nlopt
-  # library, which doesn't pick up the package in the nix store.  We
-  # additionally need to set the path via the NLOPT environment variable.
-  NLOPT = nlopt;
-
-  # prusa-slicer uses dlopen on `libudev.so` at runtime
-  NIX_LDFLAGS = lib.optionalString withSystemd "-ludev";
+  env = {
+    # The build system uses custom logic - defined in
+    # cmake/modules/FindNLopt.cmake in the package source - for finding the nlopt
+    # library, which doesn't pick up the package in the nix store.  We
+    # additionally need to set the path via the NLOPT environment variable.
+    NLOPT = nlopt;
+  }
+  // lib.optionalAttrs withSystemd {
+    # prusa-slicer uses dlopen on `libudev.so` at runtime
+    NIX_LDFLAGS = "-ludev";
+  };
 
   prePatch = ''
     # Since version 2.5.0 of nlopt we need to link to libnlopt, as libnlopt_cxx
diff --git a/pkgs/applications/version-management/svn-all-fast-export/default.nix b/pkgs/applications/version-management/svn-all-fast-export/default.nix
index d62d83c117ab..71b450f442bb 100644
--- a/pkgs/applications/version-management/svn-all-fast-export/default.nix
+++ b/pkgs/applications/version-management/svn-all-fast-export/default.nix
@@ -39,7 +39,7 @@ stdenv.mkDerivation {
     "SVN_INCLUDE=${subversion.dev}/include/subversion-1"
   ];
 
-  NIX_LDFLAGS = "-lsvn_fs-1";
+  env.NIX_LDFLAGS = "-lsvn_fs-1";
 
   dontWrapQtApps = true;
 
diff --git a/pkgs/by-name/pa/pax/package.nix b/pkgs/by-name/pa/pax/package.nix
index bf38bcd5c4b6..b63849172338 100644
--- a/pkgs/by-name/pa/pax/package.nix
+++ b/pkgs/by-name/pa/pax/package.nix
@@ -16,7 +16,9 @@ stdenv.mkDerivation (finalAttrs: {
 
   buildInputs = lib.optional stdenv.hostPlatform.isMusl musl-fts;
 
-  NIX_LDFLAGS = lib.optionalString stdenv.hostPlatform.isMusl "-lfts";
+  env = lib.optionalAttrs stdenv.hostPlatform.isMusl {
+    NIX_LDFLAGS = "-lfts";
+  };
 
   buildPhase = ''
     sh Build.sh -r -tpax
diff --git a/pkgs/by-name/ph/phash/package.nix b/pkgs/by-name/ph/phash/package.nix
index 656a89b2e832..3e9e961d2941 100644
--- a/pkgs/by-name/ph/phash/package.nix
+++ b/pkgs/by-name/ph/phash/package.nix
@@ -34,7 +34,7 @@ stdenv.mkDerivation (finalAttrs: {
     sha256 = "sha256-frISiZ89ei7XfI5F2nJJehfQZsk0Mlb4n91q/AiZ2vA=";
   };
 
-  NIX_LDFLAGS = "-lfftw3_threads";
+  env.NIX_LDFLAGS = "-lfftw3_threads";
 
   patches = [
     # proper pthread return value (https://github.com/clearscene/pHash/pull/20)
diff --git a/pkgs/by-name/ph/phodav/package.nix b/pkgs/by-name/ph/phodav/package.nix
index a5bb57ae66d0..c965f5856213 100644
--- a/pkgs/by-name/ph/phodav/package.nix
+++ b/pkgs/by-name/ph/phodav/package.nix
@@ -45,7 +45,9 @@ stdenv.mkDerivation rec {
     "-Dudevrulesdir=${placeholder "out"}/lib/udev/rules.d"
   ];
 
-  NIX_LDFLAGS = lib.optionalString stdenv.hostPlatform.isDarwin "-lintl";
+  env = lib.optionalAttrs stdenv.hostPlatform.isDarwin {
+    NIX_LDFLAGS = "-lintl";
+  };
 
   doInstallCheck = true;
 
diff --git a/pkgs/by-name/pk/pktgen/package.nix b/pkgs/by-name/pk/pktgen/package.nix
index bfb3aa43a347..2c7cf0cc9f32 100644
--- a/pkgs/by-name/pk/pktgen/package.nix
+++ b/pkgs/by-name/pk/pktgen/package.nix
@@ -45,15 +45,16 @@ stdenv.mkDerivation (finalAttrs: {
     gtk2
   ];
 
-  RTE_SDK = dpdk;
-  GUI = lib.optionalString withGtk "true";
+  env = {
+    RTE_SDK = dpdk;
+    GUI = lib.optionalString withGtk "true";
 
-  env.NIX_CFLAGS_COMPILE = toString [
-    "-Wno-error=sign-compare"
-  ];
-
-  # requires symbols from this file
-  NIX_LDFLAGS = "-lrte_net_bond";
+    NIX_CFLAGS_COMPILE = toString [
+      "-Wno-error=sign-compare"
+    ];
+    # requires symbols from this file
+    NIX_LDFLAGS = "-lrte_net_bond";
+  };
 
   postPatch = ''
     substituteInPlace lib/common/lscpu.h --replace /usr/bin/lscpu ${util-linux}/bin/lscpu
diff --git a/pkgs/by-name/pl/plugdata/package.nix b/pkgs/by-name/pl/plugdata/package.nix
index 66d9c571e179..d64452d3c066 100644
--- a/pkgs/by-name/pl/plugdata/package.nix
+++ b/pkgs/by-name/pl/plugdata/package.nix
@@ -92,18 +92,16 @@ stdenv.mkDerivation (finalAttrs: {
     })
   ];
 
-  NIX_LDFLAGS = (
-    toString [
-      "-lX11"
-      "-lXext"
-      "-lXcomposite"
-      "-lXcursor"
-      "-lXinerama"
-      "-lXrandr"
-      "-lXtst"
-      "-lXdmcp"
-    ]
-  );
+  env.NIX_LDFLAGS = toString [
+    "-lX11"
+    "-lXext"
+    "-lXcomposite"
+    "-lXcursor"
+    "-lXinerama"
+    "-lXrandr"
+    "-lXtst"
+    "-lXdmcp"
+  ];
 
   patches = [
     # fiddle~.c prevents building with gcc15. Upstream puredata has fixed this issue,
diff --git a/pkgs/by-name/po/postfix/package.nix b/pkgs/by-name/po/postfix/package.nix
index 8cbd827770bc..0989e9622ef7 100644
--- a/pkgs/by-name/po/postfix/package.nix
+++ b/pkgs/by-name/po/postfix/package.nix
@@ -147,7 +147,9 @@ stdenv.mkDerivation (finalAttrs: {
 
   enableParallelBuilding = true;
 
-  NIX_LDFLAGS = lib.optionalString withLDAP "-llber";
+  env = lib.optionalAttrs withLDAP {
+    NIX_LDFLAGS = "-llber";
+  };
 
   installTargets = [ "non-interactive-package" ];
 
diff --git a/pkgs/by-name/pp/ppp/package.nix b/pkgs/by-name/pp/ppp/package.nix
index a4c577d4c015..547c7ee8f7dd 100644
--- a/pkgs/by-name/pp/ppp/package.nix
+++ b/pkgs/by-name/pp/ppp/package.nix
@@ -73,7 +73,7 @@ stdenv.mkDerivation (finalAttrs: {
     "CC=${stdenv.cc.targetPrefix}cc"
   ];
 
-  NIX_LDFLAGS = "-lcrypt";
+  env.NIX_LDFLAGS = "-lcrypt";
 
   installFlags = [
     "sysconfdir=$(out)/etc"
diff --git a/pkgs/by-name/qt/qtgreet/package.nix b/pkgs/by-name/qt/qtgreet/package.nix
index 508e4a5f4d23..497777b37023 100644
--- a/pkgs/by-name/qt/qtgreet/package.nix
+++ b/pkgs/by-name/qt/qtgreet/package.nix
@@ -47,7 +47,7 @@ stdenv.mkDerivation (finalAttrs: {
     (lib.mesonOption "dynpath" "${placeholder "out"}/var/lib/qtgreet")
   ];
 
-  NIX_LDFLAGS = "-lwayqt-utils-qt6";
+  env.NIX_LDFLAGS = "-lwayqt-utils-qt6";
 
   meta = {
     description = "Qt based greeter for greetd, to be run under wayfire or similar wlr-based compositors";
diff --git a/pkgs/by-name/ri/ripplerx/package.nix b/pkgs/by-name/ri/ripplerx/package.nix
index 670b2cff797d..edbc55fd9a41 100644
--- a/pkgs/by-name/ri/ripplerx/package.nix
+++ b/pkgs/by-name/ri/ripplerx/package.nix
@@ -52,28 +52,30 @@ stdenv.mkDerivation (finalAttrs: {
     libXrandr
   ];
 
-  # JUCE dlopens these at runtime, standalone executable crashes without them
-  NIX_LDFLAGS = [
-    "-lX11"
-    "-lXext"
-    "-lXcursor"
-    "-lXinerama"
-    "-lXrandr"
-  ];
+  env = {
+    # JUCE dlopens these at runtime, standalone executable crashes without them
+    NIX_LDFLAGS = toString [
+      "-lX11"
+      "-lXext"
+      "-lXcursor"
+      "-lXinerama"
+      "-lXrandr"
+    ];
 
-  env.NIX_CFLAGS_COMPILE = toString [
-    # juce, compiled in this build as part of a Git submodule, uses `-flto` as
-    # a Link Time Optimization flag, and instructs the plugin compiled here to
-    # use this flag to. This breaks the build for us. Using _fat_ LTO allows
-    # successful linking while still providing LTO benefits. If our build of
-    # `juce` was used as a dependency, we could have patched that `-flto` line
-    # in our juce's source, but that is not possible because it is used as a
-    # Git Submodule.
-    "-ffat-lto-objects"
-  ];
+    NIX_CFLAGS_COMPILE = toString [
+      # juce, compiled in this build as part of a Git submodule, uses `-flto` as
+      # a Link Time Optimization flag, and instructs the plugin compiled here to
+      # use this flag to. This breaks the build for us. Using _fat_ LTO allows
+      # successful linking while still providing LTO benefits. If our build of
+      # `juce` was used as a dependency, we could have patched that `-flto` line
+      # in our juce's source, but that is not possible because it is used as a
+      # Git Submodule.
+      "-ffat-lto-objects"
+    ];
 
-  # Fontconfig error: Cannot load default config file: No such file: (null)
-  env.FONTCONFIG_FILE = "${fontconfig.out}/etc/fonts/fonts.conf";
+    # Fontconfig error: Cannot load default config file: No such file: (null)
+    FONTCONFIG_FILE = "${fontconfig.out}/etc/fonts/fonts.conf";
+  };
 
   installPhase = ''
     runHook preInstall
diff --git a/pkgs/by-name/sc/scorched3d/package.nix b/pkgs/by-name/sc/scorched3d/package.nix
index 0df07831a439..8d781d15d676 100644
--- a/pkgs/by-name/sc/scorched3d/package.nix
+++ b/pkgs/by-name/sc/scorched3d/package.nix
@@ -65,7 +65,7 @@ stdenv.mkDerivation (finalAttrs: {
 
   configureFlags = [ "--with-fftw=${fftwSinglePrec.dev}" ];
 
-  NIX_LDFLAGS = "-lopenal";
+  env.NIX_LDFLAGS = "-lopenal";
 
   meta = {
     homepage = "http://scorched3d.co.uk/";
diff --git a/pkgs/by-name/si/siege/package.nix b/pkgs/by-name/si/siege/package.nix
index c3e5901b6477..0e074b880f96 100644
--- a/pkgs/by-name/si/siege/package.nix
+++ b/pkgs/by-name/si/siege/package.nix
@@ -15,9 +15,14 @@ stdenv.mkDerivation rec {
     hash = "sha256-7BQM7dFZl5OD1g2+h6AVHCwSraeHkQlaj6hK5jW5MCY=";
   };
 
-  NIX_LDFLAGS = lib.optionalString stdenv.hostPlatform.isLinux [
-    "-lgcc_s"
-  ];
+  env =
+    lib.optionalAttrs stdenv.hostPlatform.isLinux {
+      NIX_LDFLAGS = toString [ "-lgcc_s" ];
+    }
+    // lib.optionalAttrs stdenv.cc.isClang {
+      # Borrowed solution from homebrew: https://github.com/Homebrew/homebrew-core/blob/1c7c95183c0984a84b1680422afab6578c300a27/Formula/s/siege.rb#L31
+      CFLAGS = "-Wno-int-conversion";
+    };
 
   buildInputs = [
     openssl
@@ -33,9 +38,6 @@ stdenv.mkDerivation rec {
     "--with-zlib=${zlib.dev}"
   ];
 
-  # Borrowed solution from homebrew: https://github.com/Homebrew/homebrew-core/blob/1c7c95183c0984a84b1680422afab6578c300a27/Formula/s/siege.rb#L31
-  CFLAGS = lib.optionalString stdenv.cc.isClang "-Wno-int-conversion";
-
   meta = {
     description = "HTTP load tester";
     homepage = "https://www.joedog.org/siege-home/";
diff --git a/pkgs/by-name/si/siesta/package.nix b/pkgs/by-name/si/siesta/package.nix
index 36a6c07e3b82..7c6dd18d31c0 100644
--- a/pkgs/by-name/si/siesta/package.nix
+++ b/pkgs/by-name/si/siesta/package.nix
@@ -51,7 +51,7 @@ stdenv.mkDerivation (finalAttrs: {
     scalapack
   ];
 
-  NIX_LDFLAGS = "-lm";
+  env.NIX_LDFLAGS = "-lm";
 
   cmakeFlags = [
     "-DCMAKE_POLICY_VERSION_MINIMUM=3.5"
diff --git a/pkgs/by-name/si/silver-searcher/package.nix b/pkgs/by-name/si/silver-searcher/package.nix
index 87151fd393e2..6015d39697c6 100644
--- a/pkgs/by-name/si/silver-searcher/package.nix
+++ b/pkgs/by-name/si/silver-searcher/package.nix
@@ -22,13 +22,17 @@ stdenv.mkDerivation (finalAttrs: {
 
   patches = [ ./bash-completion.patch ];
 
-  # Workaround build failure on -fno-common toolchains like upstream
-  # gcc-10. Otherwise build fails as:
-  #   ld: src/zfile.o:/build/source/src/log.h:12: multiple definition of
-  #     `print_mtx'; src/ignore.o:/build/source/src/log.h:12: first defined here
-  # TODO: remove once next release has https://github.com/ggreer/the_silver_searcher/pull/1377
-  env.NIX_CFLAGS_COMPILE = "-fcommon";
-  NIX_LDFLAGS = lib.optionalString stdenv.hostPlatform.isLinux "-lgcc_s";
+  env = {
+    # Workaround build failure on -fno-common toolchains like upstream
+    # gcc-10. Otherwise build fails as:
+    #   ld: src/zfile.o:/build/source/src/log.h:12: multiple definition of
+    #     `print_mtx'; src/ignore.o:/build/source/src/log.h:12: first defined here
+    # TODO: remove once next release has https://github.com/ggreer/the_silver_searcher/pull/1377
+    NIX_CFLAGS_COMPILE = "-fcommon";
+  }
+  // lib.optionalAttrs stdenv.hostPlatform.isLinux {
+    NIX_LDFLAGS = "-lgcc_s";
+  };
 
   nativeBuildInputs = [
     autoreconfHook
diff --git a/pkgs/by-name/sm/smpeg/package.nix b/pkgs/by-name/sm/smpeg/package.nix
index c25a0c09ad77..53b2612f4e46 100644
--- a/pkgs/by-name/sm/smpeg/package.nix
+++ b/pkgs/by-name/sm/smpeg/package.nix
@@ -93,7 +93,9 @@ stdenv.mkDerivation (finalAttrs: {
       --prefix PKG_CONFIG_PATH ":" "${lib.getDev SDL}/lib/pkgconfig"
   '';
 
-  NIX_LDFLAGS = lib.optionalString (!stdenv.hostPlatform.isDarwin) "-lX11";
+  env = lib.optionalAttrs (!stdenv.hostPlatform.isDarwin) {
+    NIX_LDFLAGS = "-lX11";
+  };
 
   meta = {
     homepage = "https://icculus.org/smpeg/";
diff --git a/pkgs/by-name/so/socalabs-papu/package.nix b/pkgs/by-name/so/socalabs-papu/package.nix
index 31632fc4ee2c..70ca9f7137e3 100644
--- a/pkgs/by-name/so/socalabs-papu/package.nix
+++ b/pkgs/by-name/so/socalabs-papu/package.nix
@@ -120,18 +120,16 @@ stdenv.mkDerivation (finalAttrs: {
 
   passthru.updateScript = nix-update-script { };
 
-  NIX_LDFLAGS = (
-    toString [
-      "-lX11"
-      "-lXext"
-      "-lXcomposite"
-      "-lXcursor"
-      "-lXinerama"
-      "-lXrandr"
-      "-lXtst"
-      "-lXdmcp"
-    ]
-  );
+  env.NIX_LDFLAGS = toString [
+    "-lX11"
+    "-lXext"
+    "-lXcomposite"
+    "-lXcursor"
+    "-lXinerama"
+    "-lXrandr"
+    "-lXtst"
+    "-lXdmcp"
+  ];
 
   meta = {
     description = "Socalabs Nintendo Gameboy PAPU Emulation Plugin";
diff --git a/pkgs/by-name/so/socalabs-rp2a03/package.nix b/pkgs/by-name/so/socalabs-rp2a03/package.nix
index 64b38d9c86f0..7bee247d80ac 100644
--- a/pkgs/by-name/so/socalabs-rp2a03/package.nix
+++ b/pkgs/by-name/so/socalabs-rp2a03/package.nix
@@ -117,18 +117,16 @@ stdenv.mkDerivation (finalAttrs: {
     runHook postInstall
   '';
 
-  NIX_LDFLAGS = (
-    toString [
-      "-lX11"
-      "-lXext"
-      "-lXcomposite"
-      "-lXcursor"
-      "-lXinerama"
-      "-lXrandr"
-      "-lXtst"
-      "-lXdmcp"
-    ]
-  );
+  env.NIX_LDFLAGS = toString [
+    "-lX11"
+    "-lXext"
+    "-lXcomposite"
+    "-lXcursor"
+    "-lXinerama"
+    "-lXrandr"
+    "-lXtst"
+    "-lXdmcp"
+  ];
 
   meta = {
     description = "Socalabs NES Ricoh 2A03 Emulation Plugin";
diff --git a/pkgs/by-name/so/socalabs-sid/package.nix b/pkgs/by-name/so/socalabs-sid/package.nix
index bc9a6d7dcdaf..792b529a75b4 100644
--- a/pkgs/by-name/so/socalabs-sid/package.nix
+++ b/pkgs/by-name/so/socalabs-sid/package.nix
@@ -152,18 +152,16 @@ stdenv.mkDerivation {
     runHook postInstall
   '';
 
-  NIX_LDFLAGS = (
-    toString [
-      "-lX11"
-      "-lXext"
-      "-lXcomposite"
-      "-lXcursor"
-      "-lXinerama"
-      "-lXrandr"
-      "-lXtst"
-      "-lXdmcp"
-    ]
-  );
+  env.NIX_LDFLAGS = toString [
+    "-lX11"
+    "-lXext"
+    "-lXcomposite"
+    "-lXcursor"
+    "-lXinerama"
+    "-lXrandr"
+    "-lXtst"
+    "-lXdmcp"
+  ];
 
   meta = {
     description = "Socalabs Commodore 64 SID Emulation Plugin";
diff --git a/pkgs/by-name/so/socalabs-sn76489/package.nix b/pkgs/by-name/so/socalabs-sn76489/package.nix
index aaf32ae6a205..a54c6b796bc2 100644
--- a/pkgs/by-name/so/socalabs-sn76489/package.nix
+++ b/pkgs/by-name/so/socalabs-sn76489/package.nix
@@ -127,18 +127,16 @@ stdenv.mkDerivation {
     runHook postInstall
   '';
 
-  NIX_LDFLAGS = (
-    toString [
-      "-lX11"
-      "-lXext"
-      "-lXcomposite"
-      "-lXcursor"
-      "-lXinerama"
-      "-lXrandr"
-      "-lXtst"
-      "-lXdmcp"
-    ]
-  );
+  env.NIX_LDFLAGS = toString [
+    "-lX11"
+    "-lXext"
+    "-lXcomposite"
+    "-lXcursor"
+    "-lXinerama"
+    "-lXrandr"
+    "-lXtst"
+    "-lXdmcp"
+  ];
 
   passthru.updateScript = nix-update-script { };
 
diff --git a/pkgs/by-name/so/socalabs-voc/package.nix b/pkgs/by-name/so/socalabs-voc/package.nix
index 3de5e6148c9c..3be3fdd55677 100644
--- a/pkgs/by-name/so/socalabs-voc/package.nix
+++ b/pkgs/by-name/so/socalabs-voc/package.nix
@@ -130,18 +130,16 @@ stdenv.mkDerivation (finalAttrs: {
     runHook postInstall
   '';
 
-  NIX_LDFLAGS = (
-    toString [
-      "-lX11"
-      "-lXext"
-      "-lXcomposite"
-      "-lXcursor"
-      "-lXinerama"
-      "-lXrandr"
-      "-lXtst"
-      "-lXdmcp"
-    ]
-  );
+  env.NIX_LDFLAGS = toString [
+    "-lX11"
+    "-lXext"
+    "-lXcomposite"
+    "-lXcursor"
+    "-lXinerama"
+    "-lXrandr"
+    "-lXtst"
+    "-lXdmcp"
+  ];
 
   passthru.updateScript = nix-update-script { };
 
diff --git a/pkgs/by-name/su/surge-XT/package.nix b/pkgs/by-name/su/surge-XT/package.nix
index 82ec458255eb..daee093f35c0 100644
--- a/pkgs/by-name/su/surge-XT/package.nix
+++ b/pkgs/by-name/su/surge-XT/package.nix
@@ -77,15 +77,13 @@ stdenv.mkDerivation (finalAttrs: {
   ];
 
   # JUCE dlopen's these at runtime, crashes without them
-  NIX_LDFLAGS = (
-    toString [
-      "-lX11"
-      "-lXext"
-      "-lXcursor"
-      "-lXinerama"
-      "-lXrandr"
-    ]
-  );
+  env.NIX_LDFLAGS = toString [
+    "-lX11"
+    "-lXext"
+    "-lXcursor"
+    "-lXinerama"
+    "-lXrandr"
+  ];
 
   passthru = {
     rev-prefix = "release_xt_";
diff --git a/pkgs/by-name/sv/svnfs/package.nix b/pkgs/by-name/sv/svnfs/package.nix
index 2c07913c63d2..d955b25b5a41 100644
--- a/pkgs/by-name/sv/svnfs/package.nix
+++ b/pkgs/by-name/sv/svnfs/package.nix
@@ -41,12 +41,20 @@ stdenv.mkDerivation (finalAttrs: {
     export LD_LIBRARY_PATH=${subversion.out}/lib
   '';
 
-  # -fcommon: workaround build failure on -fno-common toolchains like upstream
-  # gcc-10. Otherwise build fails as:
-  #   ld: svnclient.o:/build/svnfs-0.4/src/svnfs.h:40: multiple definition of
-  #     `dirbuf'; svnfs.o:/build/svnfs-0.4/src/svnfs.h:40: first defined here
-  env.NIX_CFLAGS_COMPILE = "-I ${subversion.dev}/include/subversion-1 -fcommon";
-  NIX_LDFLAGS = "-lsvn_client-1 -lsvn_subr-1";
+  env = {
+    # -fcommon: workaround build failure on -fno-common toolchains like upstream
+    # gcc-10. Otherwise build fails as:
+    #   ld: svnclient.o:/build/svnfs-0.4/src/svnfs.h:40: multiple definition of
+    #     `dirbuf'; svnfs.o:/build/svnfs-0.4/src/svnfs.h:40: first defined here
+    NIX_CFLAGS_COMPILE = toString [
+      "-I ${subversion.dev}/include/subversion-1"
+      "-fcommon"
+    ];
+    NIX_LDFLAGS = toString [
+      "-lsvn_client-1"
+      "-lsvn_subr-1"
+    ];
+  };
 
   meta = {
     description = "FUSE filesystem for accessing Subversion repositories";
diff --git a/pkgs/by-name/sy/sylpheed/package.nix b/pkgs/by-name/sy/sylpheed/package.nix
index f6149e7e9b6f..f30cee26dba6 100644
--- a/pkgs/by-name/sy/sylpheed/package.nix
+++ b/pkgs/by-name/sy/sylpheed/package.nix
@@ -54,7 +54,9 @@ stdenv.mkDerivation rec {
   configureFlags = lib.optional gpgSupport "--enable-gpgme" ++ lib.optional sslSupport "--enable-ssl";
 
   # Undefined symbols for architecture arm64: "_OBJC_CLASS_$_NSAutoreleasePool"
-  NIX_LDFLAGS = lib.optionalString stdenv.hostPlatform.isDarwin "-framework Foundation";
+  env = lib.optionalAttrs stdenv.hostPlatform.isDarwin {
+    NIX_LDFLAGS = "-framework Foundation";
+  };
 
   meta = {
     homepage = "https://sylpheed.sraoss.jp/en/";