diff --git a/pkgs/applications/window-managers/oroborus/default.nix b/pkgs/applications/window-managers/oroborus/default.nix
index 13eef1c045a..2681d31ccb1 100644
--- a/pkgs/applications/window-managers/oroborus/default.nix
+++ b/pkgs/applications/window-managers/oroborus/default.nix
@@ -11,7 +11,8 @@ stdenv.mkDerivation rec {
   version = "2.0.20";
 
   nativeBuildInputs = [ pkgconfig ];
-  buildInputs = [ freetype fribidi libSM libICE libXt libXaw libXmu libXext libXft libXpm libXrandr libXrender xextproto libXinerama ];
+  buildInputs = [ freetype fribidi libSM libICE libXt libXaw libXmu libXext
+                  libXft libXpm libXrandr libXrender xextproto libXinerama ];
 
   src = fetchurl {
     url = "http://ftp.debian.org/debian/pool/main/o/oroborus/oroborus_${version}.tar.gz";
diff --git a/pkgs/applications/window-managers/pekwm/default.nix b/pkgs/applications/window-managers/pekwm/default.nix
index bdf914fbd75..b2677218e85 100644
--- a/pkgs/applications/window-managers/pekwm/default.nix
+++ b/pkgs/applications/window-managers/pekwm/default.nix
@@ -32,7 +32,7 @@ stdenv.mkDerivation rec {
         appear as they should when starting applications.
       - Chainable Keygrabber, usability for everyone.
     '';
-      homepage = https://www.pekwm.org;
+      homepage = http://www.pekwm.org;
       license = licenses.gpl2;
       maintainers = [ maintainers.AndersonTorres ];
       platforms = platforms.linux;
diff --git a/pkgs/development/guile-modules/guile-reader/default.nix b/pkgs/development/guile-modules/guile-reader/default.nix
index 010c523507f..35bcd7bfc2f 100644
--- a/pkgs/development/guile-modules/guile-reader/default.nix
+++ b/pkgs/development/guile-modules/guile-reader/default.nix
@@ -38,7 +38,7 @@ stdenv.mkDerivation rec {
        "token readers" of a standard Scheme readers. For example, it
        is used to implement Skribilo's R5RS-derived document syntax.
     '';
-    homepage = https://www.gnu.org/software/guile-reader;
+    homepage = https://www.nongnu.org/guile-reader/;
     license = licenses.lgpl3Plus;
     maintainers = with maintainers; [ AndersonTorres ];
     platforms = platforms.gnu;
diff --git a/pkgs/development/libraries/libtap/default.nix b/pkgs/development/libraries/libtap/default.nix
index 2671199ab0e..99e0ab0a476 100644
--- a/pkgs/development/libraries/libtap/default.nix
+++ b/pkgs/development/libraries/libtap/default.nix
@@ -14,16 +14,16 @@ stdenv.mkDerivation rec{
   nativeBuildInputs = [ pkgconfig ];
   propagatedBuildInputs = [ cmake perl ];
 
-  meta = {
+  meta = with stdenv.lib; {
     description = "A library to implement a test protocol";
     longDescription = ''
       libtap is a library to implement the Test Anything Protocol for
       C originally created by Nik Clayton. This is a maintenance
       branch by Shlomi Fish.
     '';
-    homepage = http://www.shlomifish.org/open-source/projects/libtap/;
+    homepage = https://www.shlomifish.org/open-source/projects/libtap/;
     license = licenses.bsd3;
     maintainers = [ maintainers.AndersonTorres ];
-    platforms = stdenv.lib.platforms.unix;
+    platforms = platforms.unix;
   };
 }
diff --git a/pkgs/misc/emulators/higan/default.nix b/pkgs/misc/emulators/higan/default.nix
index fbe44c6540b..18db78d82ad 100644
--- a/pkgs/misc/emulators/higan/default.nix
+++ b/pkgs/misc/emulators/higan/default.nix
@@ -23,7 +23,8 @@ stdenv.mkDerivation rec {
   postPatch = "sed '1i#include <cmath>' -i higan/fc/ppu/ppu.cpp";
 
   buildInputs =
-  [ p7zip pkgconfig libX11 libXv udev libGLU_combined SDL libao openal libpulseaudio gtk2 gtksourceview ];
+  [ p7zip pkgconfig libX11 libXv udev libGLU_combined
+    SDL libao openal libpulseaudio gtk2 gtksourceview ];
 
   unpackPhase = ''
     7z x $src
@@ -75,7 +76,7 @@ stdenv.mkDerivation rec {
         - NEC's PC Engine, SuperGrafx;
         - Bandai's WonderSwan, WonderSwan Color.
     '';
-    homepage = https://byuu.org/higan/;
+    homepage = https://byuu.org/emulation/higan/;
     license = licenses.gpl3Plus;
     maintainers = with maintainers; [ AndersonTorres ];
     platforms = with platforms; unix;