diff --git a/pkgs/assaultcube/default.nix b/pkgs/assaultcube/default.nix
index 86c7f60..914af52 100644
--- a/pkgs/assaultcube/default.nix
+++ b/pkgs/assaultcube/default.nix
@@ -3,7 +3,7 @@
 , stdenv
 , makeDesktopItem
 , openal
-, pkgconfig
+, pkg-config
 , libogg
 , libvorbis
 , SDL
@@ -38,7 +38,7 @@ stdenv.mkDerivation rec {
   # was useless before someone broke SDL_image, see https://github.com/NixOS/nixpkgs/pull/97919/
   NIX_LDFLAGS = "-lpng -ljpeg";
 
-  nativeBuildInputs = [ makeWrapper pkgconfig ];
+  nativeBuildInputs = [ makeWrapper pkg-config ];
 
   buildInputs = [ file zlib ]
     ++ optionals client [ openal SDL SDL_image libogg libvorbis libjpeg_turbo libpng ];
diff --git a/pkgs/caprice32/default.nix b/pkgs/caprice32/default.nix
index 2bba408..a1036c1 100644
--- a/pkgs/caprice32/default.nix
+++ b/pkgs/caprice32/default.nix
@@ -3,7 +3,7 @@
 , fetchFromGitHub
 , desktop-file-utils
 , libpng
-, pkgconfig
+, pkg-config
 , SDL2
 , freetype
 , zlib
@@ -21,7 +21,7 @@ stdenv.mkDerivation rec {
     sha256 = "sha256-bO1HJxNp9+aFukvtaoz9WrB6y21ok3Dxu+CpyoRf+2Q=";
   };
 
-  nativeBuildInputs = [ desktop-file-utils pkgconfig ];
+  nativeBuildInputs = [ desktop-file-utils pkg-config ];
   buildInputs = [ libpng SDL2 freetype zlib ];
 
   makeFlags = [
diff --git a/pkgs/freediag/default.nix b/pkgs/freediag/default.nix
index 273e5a4..21b1e05 100644
--- a/pkgs/freediag/default.nix
+++ b/pkgs/freediag/default.nix
@@ -2,7 +2,7 @@
 , stdenv
 , fetchFromGitHub
 , cmake
-, pkgconfig
+, pkg-config
 , enableGUI ? false
 , libGLU_combined ? null
 , fltk ? null
@@ -23,7 +23,7 @@ stdenv.mkDerivation rec {
     sha256 = "0krwbz9jnyzjwmjkx1ffh7v3qk8r2xd4lg3jm9mqxyiw780r4n4s";
   };
 
-  nativeBuildInputs = [ cmake pkgconfig ];
+  nativeBuildInputs = [ cmake pkg-config ];
   buildInputs = optionals enableGUI [ libGLU_combined fltk ];
 
   cmakeFlags = optional enableGUI [ "-DBUILD_GUI=1" ];
diff --git a/pkgs/magick2cpc/default.nix b/pkgs/magick2cpc/default.nix
index 331110a..9478bf3 100644
--- a/pkgs/magick2cpc/default.nix
+++ b/pkgs/magick2cpc/default.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchFromGitHub, imagemagick6, pkgconfig, autoreconfHook }:
+{ lib, stdenv, fetchFromGitHub, imagemagick6, pkg-config, autoreconfHook }:
 
 stdenv.mkDerivation rec {
   name = "magick2cpc-${version}";
@@ -11,7 +11,7 @@ stdenv.mkDerivation rec {
     sha256 = "16412i9skdmi9a297dxwr6817wfwafbpx4vxfkks9pwx2jcmp75j";
   };
 
-  nativeBuildInputs = [ autoreconfHook pkgconfig ];
+  nativeBuildInputs = [ autoreconfHook pkg-config ];
   buildInputs = [ imagemagick6 ];
 
   meta = with lib; {
diff --git a/pkgs/mkpsxiso/default.nix b/pkgs/mkpsxiso/default.nix
index e349af3..f17ba6b 100644
--- a/pkgs/mkpsxiso/default.nix
+++ b/pkgs/mkpsxiso/default.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchFromGitHub, cmake, pkgconfig, tinyxml2 }:
+{ lib, stdenv, fetchFromGitHub, cmake, pkg-config, tinyxml2 }:
 
 stdenv.mkDerivation rec {
   pname = "mkpsxiso";
@@ -18,7 +18,7 @@ stdenv.mkDerivation rec {
   #'';
 
   buildInputs = [ tinyxml2 ];
-  nativeBuildInputs = [ cmake pkgconfig ];
+  nativeBuildInputs = [ cmake pkg-config ];
   #cmakeFlags = [
   #  "-DTINYXML_INCLUDE_DIR=${tinyxml}/include"
   #  "-DTINYXML_LIBRARIES=${tinyxml}/lib"
diff --git a/pkgs/navit/default.nix b/pkgs/navit/default.nix
index 796eb93..1a375ab 100644
--- a/pkgs/navit/default.nix
+++ b/pkgs/navit/default.nix
@@ -1,7 +1,7 @@
 { lib
 , stdenv
 , fetchFromGitHub
-, pkgconfig
+, pkg-config
 , fontconfig
 , freetype
 , imlib2
@@ -13,13 +13,13 @@
 , librsvg #inkscape
 , libxslt
 , cairo
-, gdk_pixbuf
+, gdk-pixbuf
 , pango
 , atk
 , patchelf
 , fetchurl
 , bzip2
-, python
+, python3
 , gettext
 , libpng
 , zlib
@@ -120,12 +120,12 @@ stdenv.mkDerivation rec {
     "-DCMAKE_RC_COMPILER=${stdenv.cc.targetPrefix}windres"
   ];
 
-  nativeBuildInputs = [ gettext makeWrapper pkgconfig cmake patchelf bzip2 libxslt ]
+  nativeBuildInputs = [ gettext makeWrapper pkg-config cmake patchelf bzip2 libxslt ]
     ++ optional stdenv.targetPlatform.isMinGW nsis;
 
   buildInputs = [ libpng zlib ]
     ++ optionals stdenv.hostPlatform.isLinux [
-    python
+    python3
     gd
     freetype
     fribidi
@@ -136,7 +136,7 @@ stdenv.mkDerivation rec {
     gpsd
     shapelib
   ]
-    ++ optionals gtkSupport [ atk cairo gtk2 gdk_pixbuf pango imlib2 ]
+    ++ optionals gtkSupport [ atk cairo gtk2 gdk-pixbuf pango imlib2 ]
     ++ optionals sdlSupport [ SDL SDL_image ]
     ++ optionals qtSupport [
     qtquickcontrols
diff --git a/pkgs/nsntrace/default.nix b/pkgs/nsntrace/default.nix
index 7392729..4320ab7 100644
--- a/pkgs/nsntrace/default.nix
+++ b/pkgs/nsntrace/default.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchFromGitHub, autoreconfHook, pkgconfig, iptables, libpcap, libxslt, libnl }:
+{ lib, stdenv, fetchFromGitHub, autoreconfHook, pkg-config, iptables, libpcap, libxslt, libnl }:
 
 stdenv.mkDerivation rec {
   version = "unstable-2020-05-25";
@@ -11,7 +11,7 @@ stdenv.mkDerivation rec {
     sha256 = "1650h49gr8dn2z9m7cglg8whvyc7isf071aqbxz2zxlq432858y7";
   };
 
-  nativeBuildInputs = [ autoreconfHook pkgconfig ];
+  nativeBuildInputs = [ autoreconfHook pkg-config ];
   buildInputs = [ iptables libnl libpcap libxslt ];
 
   #very ugly for now
diff --git a/pkgs/quickbms/default.nix b/pkgs/quickbms/default.nix
index 14917f9..48ca34b 100644
--- a/pkgs/quickbms/default.nix
+++ b/pkgs/quickbms/default.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchurl, pkgconfig, unzip, lzo, bzip2, zlib, openssl }:
+{ lib, stdenv, fetchurl, pkg-config, unzip, lzo, bzip2, zlib, openssl }:
 
 stdenv.mkDerivation rec {
   version = "0.10.1";
diff --git a/pkgs/scriptcommunicator/default.nix b/pkgs/scriptcommunicator/default.nix
index 301d7c5..30ceb8f 100644
--- a/pkgs/scriptcommunicator/default.nix
+++ b/pkgs/scriptcommunicator/default.nix
@@ -2,7 +2,7 @@
 , stdenv
 , fetchFromGitHub
 , qmake
-, pkgconfig
+, pkg-config
 , libpng
 , zlib
 , unzip