diff --git a/pkgs/applications/misc/wego/default.nix b/pkgs/applications/misc/wego/default.nix
index b61566af6b2c..7a09a8045770 100644
--- a/pkgs/applications/misc/wego/default.nix
+++ b/pkgs/applications/misc/wego/default.nix
@@ -14,4 +14,8 @@ buildGoPackage rec {
   };
 
   goDeps = ./deps.nix;
+
+  meta = {
+    license = stdenv.lib.licenses.isc;
+  };
 }
diff --git a/pkgs/applications/networking/sipcmd/default.nix b/pkgs/applications/networking/sipcmd/default.nix
index 4c8a90137bd0..a36c2286956b 100644
--- a/pkgs/applications/networking/sipcmd/default.nix
+++ b/pkgs/applications/networking/sipcmd/default.nix
@@ -28,6 +28,7 @@ stdenv.mkDerivation rec {
     homepage = https://github.com/tmakkonen/sipcmd;
     description = "The command line SIP/H.323/RTP softphone";
     platforms = with stdenv.lib.platforms; linux;
+    license = stdenv.lib.licenses.gpl2;
   };
 }
 
diff --git a/pkgs/development/libraries/rlog/default.nix b/pkgs/development/libraries/rlog/default.nix
index f96addffb1ae..f8268b5eb7cd 100644
--- a/pkgs/development/libraries/rlog/default.nix
+++ b/pkgs/development/libraries/rlog/default.nix
@@ -12,5 +12,6 @@ stdenv.mkDerivation {
     homepage = http://www.arg0.net/rlog;
     description = "A C++ logging library used in encfs";
     platforms = stdenv.lib.platforms.linux;
+    license = stdenv.lib.licenses.lgpl3;
   };
 }
diff --git a/pkgs/development/libraries/tnt/default.nix b/pkgs/development/libraries/tnt/default.nix
index 23ef997e5ce1..229e4cfaa6c0 100644
--- a/pkgs/development/libraries/tnt/default.nix
+++ b/pkgs/development/libraries/tnt/default.nix
@@ -19,6 +19,7 @@ stdenv.mkDerivation rec {
   meta = {
     homepage = https://math.nist.gov/tnt/;
     description = "Template Numerical Toolkit: C++ headers for array and matrices";
+    license = stdenv.lib.licenses.publicDomain;
     platforms = stdenv.lib.platforms.unix;
   };
 }
diff --git a/pkgs/development/libraries/wolfssl/default.nix b/pkgs/development/libraries/wolfssl/default.nix
index 30291a180226..8f57a0bf1b71 100644
--- a/pkgs/development/libraries/wolfssl/default.nix
+++ b/pkgs/development/libraries/wolfssl/default.nix
@@ -29,6 +29,7 @@ stdenv.mkDerivation rec {
     description = "A small, fast, portable implementation of TLS/SSL for embedded devices";
     homepage    = "https://www.wolfssl.com/";
     platforms   = platforms.all;
+    license = stdenv.lib.licenses.gpl2;
     maintainers = with maintainers; [ mcmtroffaes ];
   };
 }
diff --git a/pkgs/tools/text/zimreader/default.nix b/pkgs/tools/text/zimreader/default.nix
index 4271bf095a14..fbd9bc3fa20a 100644
--- a/pkgs/tools/text/zimreader/default.nix
+++ b/pkgs/tools/text/zimreader/default.nix
@@ -31,6 +31,7 @@ stdenv.mkDerivation rec {
   meta = {
     description = "A tool to serve ZIM files using HTTP";
     homepage = http://git.wikimedia.org/log/openzim;
+    license = stdenv.lib.licenses.gpl2;
     maintainers = with stdenv.lib.maintainers; [ robbinch juliendehos ];
     platforms = [ "x86_64-linux" ];
   };