diff --git a/pkgs/applications/graphics/ipe/default.nix b/pkgs/applications/graphics/ipe/default.nix
index c30bef90f3d..01f17bb41b9 100644
--- a/pkgs/applications/graphics/ipe/default.nix
+++ b/pkgs/applications/graphics/ipe/default.nix
@@ -55,7 +55,7 @@ stdenv.mkDerivation rec {
     "IPE_NO_SPELLCHECK=1" # qtSpell is not yet packaged
   ];
 
-  qtWrapperArgs = lib.optional withTeXLive [ "--prefix PATH : ${lib.makeBinPath [ texlive ]}" ];
+  qtWrapperArgs = lib.optionals withTeXLive [ "--prefix PATH : ${lib.makeBinPath [ texlive ]}" ];
 
   enableParallelBuilding = true;
 
diff --git a/pkgs/development/libraries/mpfr/default.nix b/pkgs/development/libraries/mpfr/default.nix
index aba3a413a66..cf5035948cb 100644
--- a/pkgs/development/libraries/mpfr/default.nix
+++ b/pkgs/development/libraries/mpfr/default.nix
@@ -30,7 +30,7 @@ stdenv.mkDerivation rec {
 
   configureFlags = lib.optional stdenv.hostPlatform.isSunOS "--disable-thread-safe"
     ++ lib.optional stdenv.hostPlatform.is64bit "--with-pic"
-    ++ lib.optional stdenv.hostPlatform.isPower64 [
+    ++ lib.optionals stdenv.hostPlatform.isPower64 [
       # Without this, the `tget_set_d128` test experiences a link
       # error due to missing `__dpd_trunctdkf`.
       "--disable-decimal-float"
diff --git a/pkgs/development/python-modules/python-mapnik/default.nix b/pkgs/development/python-modules/python-mapnik/default.nix
index a6e42d2369b..5eee8f59c39 100644
--- a/pkgs/development/python-modules/python-mapnik/default.nix
+++ b/pkgs/development/python-modules/python-mapnik/default.nix
@@ -133,7 +133,7 @@ buildPythonPackage rec {
     "test_visual_zoom_all_rendering1"
     "test_visual_zoom_all_rendering2"
     "test_wgs84_inverse_forward"
-  ] ++ lib.optional stdenv.isDarwin [
+  ] ++ lib.optionals stdenv.isDarwin [
     "test_passing_pycairo_context_pdf"
   ];
 
diff --git a/pkgs/development/tools/rust/cargo-dephell/default.nix b/pkgs/development/tools/rust/cargo-dephell/default.nix
index 374e88ad38e..6a6cfa46d5f 100644
--- a/pkgs/development/tools/rust/cargo-dephell/default.nix
+++ b/pkgs/development/tools/rust/cargo-dephell/default.nix
@@ -32,7 +32,7 @@ rustPlatform.buildRustPackage rec {
 
   buildInputs = [
     openssl
-  ] ++ lib.optional stdenv.isDarwin [
+  ] ++ lib.optionals stdenv.isDarwin [
     curl
     darwin.apple_sdk.frameworks.Security
     libgit2_1_3_0
diff --git a/pkgs/misc/ghostscript/default.nix b/pkgs/misc/ghostscript/default.nix
index 2588e7e9140..ad1f3e8e1e4 100644
--- a/pkgs/misc/ghostscript/default.nix
+++ b/pkgs/misc/ghostscript/default.nix
@@ -60,7 +60,7 @@ let
 
 in
 stdenv.mkDerivation rec {
-  pname = "ghostscript${lib.optionalString (x11Support) "-with-X"}";
+  pname = "ghostscript${lib.optionalString x11Support "-with-X"}";
   version = "10.01.1";
 
   src = fetchurl {
@@ -112,7 +112,7 @@ stdenv.mkDerivation rec {
   ] ++ lib.optionals dynamicDrivers [
     "--enable-dynamic"
     "--disable-hidden-visibility"
-  ] ++ lib.optional x11Support [
+  ] ++ lib.optionals x11Support [
     "--with-x"
   ] ++ lib.optionals cupsSupport [
     "--enable-cups"
diff --git a/pkgs/os-specific/linux/ax99100/default.nix b/pkgs/os-specific/linux/ax99100/default.nix
index 9ff6add9fe9..91999c0113c 100644
--- a/pkgs/os-specific/linux/ax99100/default.nix
+++ b/pkgs/os-specific/linux/ax99100/default.nix
@@ -1,6 +1,6 @@
-{ kernel, stdenv, kmod, lib, fetchzip, fetchpatch, dos2unix }:
-stdenv.mkDerivation
-{
+{ kernel, stdenv, kmod, lib, fetchzip, dos2unix }:
+
+stdenv.mkDerivation {
   pname = "ax99100";
   version = "1.8.0";
 
@@ -26,9 +26,9 @@ stdenv.mkDerivation
   patches = [
     ./kernel-5.18-pci_free_consistent-pci_alloc_consistent.patch
     ./kernel-6.1-set_termios-const-ktermios.patch
-  ] ++ (lib.optional (lib.versionAtLeast kernel.version "6.2") [
+  ] ++ lib.optionals (lib.versionAtLeast kernel.version "6.2") [
     ./kernel-6.2-fix-pointer-type.patch
-  ]);
+  ];
 
   patchFlags = [ "-p0" ];
 
diff --git a/pkgs/tools/misc/flashrom/default.nix b/pkgs/tools/misc/flashrom/default.nix
index 3bd04051263..6463595c28c 100644
--- a/pkgs/tools/misc/flashrom/default.nix
+++ b/pkgs/tools/misc/flashrom/default.nix
@@ -1,5 +1,4 @@
 { fetchurl
-, fetchpatch
 , stdenv
 , installShellFiles
 , lib
@@ -22,7 +21,7 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ pkg-config installShellFiles ];
   buildInputs = [ libftdi1 libusb1 ]
-    ++ lib.optional (!stdenv.isDarwin) [ pciutils ]
+    ++ lib.optionals (!stdenv.isDarwin) [ pciutils ]
     ++ lib.optional jlinkSupport libjaylink;
 
   postPatch = ''