diff --git a/pkgs/applications/radio/sdrangel/default.nix b/pkgs/applications/radio/sdrangel/default.nix
index 392088eca95f..0bda52d425e4 100644
--- a/pkgs/applications/radio/sdrangel/default.nix
+++ b/pkgs/applications/radio/sdrangel/default.nix
@@ -1,4 +1,6 @@
-{ airspy
+{ lib
+, stdenv
+, airspy
 , airspyhf
 , aptdec
 , boost
@@ -13,7 +15,6 @@
 , glew
 , hackrf
 , hidapi
-, lib
 , ffmpeg
 , libiio
 , libopus
@@ -95,7 +96,7 @@ mkDerivation rec {
     "-DDAB_LIB=${dab_lib}"
     "-DLIBSERIALDV_INCLUDE_DIR:PATH=${serialdv}/include/serialdv"
     "-DLIMESUITE_INCLUDE_DIR:PATH=${limesuite}/include"
-    "-DLIMESUITE_LIBRARY:FILEPATH=${limesuite}/lib/libLimeSuite.so"
+    "-DLIMESUITE_LIBRARY:FILEPATH=${limesuite}/lib/libLimeSuite${stdenv.hostPlatform.extensions.sharedLibrary}"
     "-DSGP4_DIR=${sgp4}"
     "-DSOAPYSDR_DIR=${soapysdr-with-plugins}"
   ];
@@ -110,6 +111,6 @@ mkDerivation rec {
     homepage = "https://github.com/f4exb/sdrangel";
     license = licenses.gpl3Plus;
     maintainers = with maintainers; [ alkeryn ];
-    platforms = platforms.linux;
+    platforms = platforms.unix;
   };
 }
diff --git a/pkgs/development/libraries/aptdec/default.nix b/pkgs/development/libraries/aptdec/default.nix
index 5f1db6d35593..dce52f7e668c 100644
--- a/pkgs/development/libraries/aptdec/default.nix
+++ b/pkgs/development/libraries/aptdec/default.nix
@@ -26,6 +26,6 @@ stdenv.mkDerivation {
     homepage = "https://github.com/Xerbo/aptdec";
     license = licenses.gpl2;
     maintainers = with maintainers; [ alexwinter ];
-    platforms = platforms.linux;
+    platforms = platforms.unix;
   };
 }
diff --git a/pkgs/development/libraries/cm256cc/default.nix b/pkgs/development/libraries/cm256cc/default.nix
index 3a2538898cce..4b49bcbbcc99 100644
--- a/pkgs/development/libraries/cm256cc/default.nix
+++ b/pkgs/development/libraries/cm256cc/default.nix
@@ -23,7 +23,7 @@ stdenv.mkDerivation rec {
   meta = with lib; {
     description = "Fast GF(256) Cauchy MDS Block Erasure Codec in C++";
     homepage = "https://github.com/f4exb/cm256cc";
-    platforms = platforms.linux;
+    platforms = platforms.unix;
     maintainers = with maintainers; [ alkeryn ];
     license = licenses.gpl3;
   };
diff --git a/pkgs/development/libraries/dab_lib/default.nix b/pkgs/development/libraries/dab_lib/default.nix
index 7570d8aaca72..019456b3c5d7 100644
--- a/pkgs/development/libraries/dab_lib/default.nix
+++ b/pkgs/development/libraries/dab_lib/default.nix
@@ -23,6 +23,6 @@ stdenv.mkDerivation {
     homepage = "https://github.com/JvanKatwijk/dab-cmdline";
     license = licenses.gpl2;
     maintainers = with maintainers; [ alexwinter ];
-    platforms = platforms.linux;
+    platforms = platforms.unix;
   };
 }
diff --git a/pkgs/development/libraries/dsdcc/default.nix b/pkgs/development/libraries/dsdcc/default.nix
index a992eac27cb0..3bc8d6c49a8e 100644
--- a/pkgs/development/libraries/dsdcc/default.nix
+++ b/pkgs/development/libraries/dsdcc/default.nix
@@ -30,6 +30,6 @@ stdenv.mkDerivation rec {
     homepage = "https://github.com/f4exb/dsdcc";
     license = licenses.gpl3;
     maintainers = with maintainers; [ alexwinter ];
-    platforms = platforms.linux;
+    platforms = platforms.unix;
   };
 }
diff --git a/pkgs/development/libraries/opencv/3.x.nix b/pkgs/development/libraries/opencv/3.x.nix
index 75d8c712df1f..45d55542c82a 100644
--- a/pkgs/development/libraries/opencv/3.x.nix
+++ b/pkgs/development/libraries/opencv/3.x.nix
@@ -32,7 +32,7 @@
 , enableDC1394    ? false, libdc1394
 , enableDocs      ? false, doxygen, graphviz-nox
 
-, AVFoundation, Cocoa, VideoDecodeAcceleration, bzip2
+, AVFoundation, Cocoa, VideoDecodeAcceleration, bzip2, CoreMedia, MediaToolbox
 }:
 
 assert blas.implementation == "openblas" && lapack.implementation == "openblas";
@@ -211,7 +211,7 @@ stdenv.mkDerivation {
     # tesseract & leptonica.
     ++ lib.optionals enableTesseract [ tesseract leptonica ]
     ++ lib.optional enableTbb tbb
-    ++ lib.optionals stdenv.isDarwin [ bzip2 AVFoundation Cocoa VideoDecodeAcceleration ]
+    ++ lib.optionals stdenv.isDarwin [ bzip2 AVFoundation Cocoa VideoDecodeAcceleration CoreMedia MediaToolbox ]
     ++ lib.optionals enableDocs [ doxygen graphviz-nox ];
 
   propagatedBuildInputs = lib.optional enablePython pythonPackages.numpy
@@ -250,7 +250,6 @@ stdenv.mkDerivation {
   ] ++ lib.optionals stdenv.isDarwin [
     "-DWITH_OPENCL=OFF"
     "-DWITH_LAPACK=OFF"
-    "-DBUILD_opencv_videoio=OFF"
   ] ++ lib.optionals enablePython [
     "-DOPENCV_SKIP_PYTHON_LOADER=ON"
   ] ++ lib.optionals enableEigen [
diff --git a/pkgs/development/libraries/qt-5/modules/qtspeech.nix b/pkgs/development/libraries/qt-5/modules/qtspeech.nix
index a1ecb48f0d9d..371162324c0b 100644
--- a/pkgs/development/libraries/qt-5/modules/qtspeech.nix
+++ b/pkgs/development/libraries/qt-5/modules/qtspeech.nix
@@ -1,9 +1,9 @@
-{ qtModule, speechd, pkg-config }:
+{ lib, qtModule, stdenv, speechd, pkg-config }:
 
 qtModule {
   pname = "qtspeech";
   qtInputs = [ ];
-  buildInputs = [ speechd ];
+  buildInputs = lib.optionals stdenv.isLinux [ speechd ];
   nativeBuildInputs = [ pkg-config ];
   outputs = [ "out" "dev" ];
 }
diff --git a/pkgs/development/libraries/qt-5/modules/qtwebengine.nix b/pkgs/development/libraries/qt-5/modules/qtwebengine.nix
index bebfe37f686e..60899e50535f 100644
--- a/pkgs/development/libraries/qt-5/modules/qtwebengine.nix
+++ b/pkgs/development/libraries/qt-5/modules/qtwebengine.nix
@@ -221,6 +221,7 @@ qtModule {
     Prefix = ..
     EOF
 
+  '' + ''
     # Fix for out-of-sync QtWebEngine and Qt releases (since 5.15.3)
     sed 's/${lib.head (lib.splitString "-" version)} /${qtCompatVersion} /' -i "$out"/lib/cmake/*/*Config.cmake
   '';
diff --git a/pkgs/development/libraries/serialdv/default.nix b/pkgs/development/libraries/serialdv/default.nix
index d1d9c6299b35..bff7a107eebe 100644
--- a/pkgs/development/libraries/serialdv/default.nix
+++ b/pkgs/development/libraries/serialdv/default.nix
@@ -16,7 +16,7 @@ stdenv.mkDerivation rec {
   meta = with lib; {
     description = "C++ Minimal interface to encode and decode audio with AMBE3000 based devices in packet mode over a serial link";
     homepage = "https://github.com/f4exb/serialdv";
-    platforms = platforms.linux;
+    platforms = platforms.unix;
     maintainers = with maintainers; [ alkeryn ];
     license = licenses.gpl3;
   };
diff --git a/pkgs/development/libraries/sgp4/default.nix b/pkgs/development/libraries/sgp4/default.nix
index 98c62f9cd345..166e3c08fd30 100644
--- a/pkgs/development/libraries/sgp4/default.nix
+++ b/pkgs/development/libraries/sgp4/default.nix
@@ -18,6 +18,6 @@ stdenv.mkDerivation {
     homepage = "https://github.com/dnwrnr/sgp4";
     license = licenses.asl20;
     maintainers = with maintainers; [ alexwinter ];
-    platforms = platforms.linux;
+    platforms = platforms.unix;
   };
 }
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 045d0b908b8d..37c573123715 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -22816,7 +22816,7 @@ with pkgs;
   };
 
   opencv3 = callPackage ../development/libraries/opencv/3.x.nix {
-    inherit (darwin.apple_sdk.frameworks) AVFoundation Cocoa VideoDecodeAcceleration;
+    inherit (darwin.apple_sdk.frameworks) AVFoundation Cocoa VideoDecodeAcceleration CoreMedia MediaToolbox;
     ffmpeg = ffmpeg_4;
   };