diff --git a/lib/licenses.nix b/lib/licenses.nix
index c370af34679..611e6ddb35b 100644
--- a/lib/licenses.nix
+++ b/lib/licenses.nix
@@ -585,6 +585,11 @@ lib.mapAttrs (n: v: v // { shortName = n; }) rec {
     fullName = "Ruby License";
   };
 
+  sendmail = spdx {
+    spdxId = "Sendmail";
+    fullName = "Sendmail License";
+  };
+
   sgi-b-20 = spdx {
     spdxId = "SGI-B-2.0";
     fullName = "SGI Free Software License B v2.0";
diff --git a/pkgs/development/libraries/libdbusmenu-qt/default.nix b/pkgs/development/libraries/libdbusmenu-qt/default.nix
index 501341d202b..72c3ca0e2b0 100644
--- a/pkgs/development/libraries/libdbusmenu-qt/default.nix
+++ b/pkgs/development/libraries/libdbusmenu-qt/default.nix
@@ -24,6 +24,6 @@ stdenv.mkDerivation {
     description = "Provides a Qt implementation of the DBusMenu spec";
     inherit homepage;
     inherit (qt4.meta) platforms;
-    license = licenses.gpl2;
+    license = licenses.lgpl2;
   };
 }
diff --git a/pkgs/development/libraries/libdbusmenu-qt/qt-5.5.nix b/pkgs/development/libraries/libdbusmenu-qt/qt-5.5.nix
index e8651de2b34..60572e7676b 100644
--- a/pkgs/development/libraries/libdbusmenu-qt/qt-5.5.nix
+++ b/pkgs/development/libraries/libdbusmenu-qt/qt-5.5.nix
@@ -19,6 +19,6 @@ stdenv.mkDerivation {
     description = "Provides a Qt implementation of the DBusMenu spec";
     maintainers = [ maintainers.ttuegel ];
     inherit (qtbase.meta) platforms;
-    license = licenses.gpl2;
+    license = licenses.lgpl2;
   };
 }
diff --git a/pkgs/development/libraries/libgnome-keyring/default.nix b/pkgs/development/libraries/libgnome-keyring/default.nix
index 0b496ff593b..8dcbab95e97 100644
--- a/pkgs/development/libraries/libgnome-keyring/default.nix
+++ b/pkgs/development/libraries/libgnome-keyring/default.nix
@@ -16,6 +16,6 @@ stdenv.mkDerivation {
 
   meta = {
     inherit (glib.meta) platforms maintainers;
-    license = stdenv.lib.licenses.gpl2;
+    license = with stdenv.lib.licenses; [ gpl2 lgpl2 ];
   };
 }
diff --git a/pkgs/development/libraries/libite/default.nix b/pkgs/development/libraries/libite/default.nix
index 1616aa1e0cc..0b00cf90ba0 100644
--- a/pkgs/development/libraries/libite/default.nix
+++ b/pkgs/development/libraries/libite/default.nix
@@ -31,7 +31,7 @@ stdenv.mkDerivation rec {
     '';
     platforms = platforms.unix;
     maintainers = with maintainers; [ fpletz ];
-    license = with licenses; [ mit isc ];
+    license = with licenses; [ mit isc bsd2 bsd3 ];
   };
 }
 
diff --git a/pkgs/development/libraries/libjson/default.nix b/pkgs/development/libraries/libjson/default.nix
index a53918fd5f7..c83143dd6b1 100644
--- a/pkgs/development/libraries/libjson/default.nix
+++ b/pkgs/development/libraries/libjson/default.nix
@@ -11,10 +11,17 @@ in stdenv.mkDerivation rec {
   buildInputs = [ unzip ];
   makeFlags = [ "prefix=$(out)" ];
   preInstall = "mkdir -p $out/lib";
-  meta = {
+
+  meta = with stdenv.lib; {
     homepage = http://libjson.sourceforge.net/;
     description = "A JSON reader and writer";
-    longDescription = "A JSON reader and writer which is super-effiecient and usually runs circles around other JSON libraries. It's highly customizable to optimize for your particular project, and very lightweight. For Windows, OSX, or Linux. Works in any language.";
-    platforms = stdenv.lib.platforms.unix;
+    longDescription = ''
+      A JSON reader and writer which is super-efficient and
+      usually runs circles around other JSON libraries.
+      It's highly customizable to optimize for your particular project, and
+      very lightweight. For Windows, OSX, or Linux. Works in any language.
+    '';
+    platforms = platforms.unix;
+    license = licenses.bsd2;
   };
 }
diff --git a/pkgs/development/libraries/libkate/default.nix b/pkgs/development/libraries/libkate/default.nix
index 6c7e5881a78..7eff302397a 100644
--- a/pkgs/development/libraries/libkate/default.nix
+++ b/pkgs/development/libraries/libkate/default.nix
@@ -10,7 +10,7 @@ stdenv.mkDerivation rec {
 
   buildInputs = [ libogg libpng ];
 
-  meta = {
+  meta = with stdenv.lib; {
     description = "A library for encoding and decoding Kate streams";
     longDescription = ''
       This is libkate, the reference implementation of a codec for the Kate
@@ -18,7 +18,7 @@ stdenv.mkDerivation rec {
       in an Ogg container. It can carry Unicode text, images, and animate
       them.'';
     homepage = https://code.google.com/archive/p/libkate/;
-    maintainers = [ ];
-    platforms = stdenv.lib.platforms.unix;
+    platforms = platforms.unix;
+    license = licenses.bsd3;
   };
 }
diff --git a/pkgs/development/libraries/liblastfm/default.nix b/pkgs/development/libraries/liblastfm/default.nix
index 331422dd892..b7d90100837 100644
--- a/pkgs/development/libraries/liblastfm/default.nix
+++ b/pkgs/development/libraries/liblastfm/default.nix
@@ -18,11 +18,12 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ pkgconfig which cmake ];
   buildInputs = stdenv.lib.optional stdenv.isDarwin darwin.apple_sdk.frameworks.SystemConfiguration;
 
-  meta = {
+  meta = with stdenv.lib; {
     homepage = https://github.com/lastfm/liblastfm;
     repositories.git = git://github.com/lastfm/liblastfm.git;
     description = "Official LastFM library";
     inherit (qt4.meta) platforms;
-    maintainers = with stdenv.lib.maintainers; [ phreedom ];
+    maintainers =  [ maintainers.phreedom ];
+    license = licenses.gpl3;
   };
 }
diff --git a/pkgs/development/libraries/liblastfmSF/default.nix b/pkgs/development/libraries/liblastfmSF/default.nix
index 73d996c5ec8..d9f460d44e8 100644
--- a/pkgs/development/libraries/liblastfmSF/default.nix
+++ b/pkgs/development/libraries/liblastfmSF/default.nix
@@ -15,5 +15,6 @@ stdenv.mkDerivation rec {
   meta = {
     homepage = http://liblastfm.sourceforge.net;
     description = "Unofficial C lastfm library";
+    license = stdenv.lib.licenses.gpl3;
   };
 }
diff --git a/pkgs/development/libraries/liblqr-1/default.nix b/pkgs/development/libraries/liblqr-1/default.nix
index 4b445c93175..aa6922ea342 100644
--- a/pkgs/development/libraries/liblqr-1/default.nix
+++ b/pkgs/development/libraries/liblqr-1/default.nix
@@ -15,6 +15,6 @@ stdenv.mkDerivation rec {
     homepage = http://liblqr.wikidot.com;
     description = "Seam-carving C/C++ library called Liquid Rescaling";
     platforms = platforms.all;
-    maintainers = [ ];
+    license = with licenses; [ gpl3 lgpl3 ];
   };
 }
diff --git a/pkgs/development/libraries/libmilter/default.nix b/pkgs/development/libraries/libmilter/default.nix
index bd0cd9fe904..7e3c45634d9 100644
--- a/pkgs/development/libraries/libmilter/default.nix
+++ b/pkgs/development/libraries/libmilter/default.nix
@@ -37,5 +37,6 @@ stdenv.mkDerivation rec {
     description = "Sendmail Milter mail filtering API library";
     platforms = platforms.unix;
     maintainers = with maintainers; [ fpletz ];
+    license = licenses.sendmail;
   };
 }
diff --git a/pkgs/development/libraries/libmms/default.nix b/pkgs/development/libraries/libmms/default.nix
index d1dd7860de4..7f73fb09cd1 100644
--- a/pkgs/development/libraries/libmms/default.nix
+++ b/pkgs/development/libraries/libmms/default.nix
@@ -12,9 +12,10 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ pkgconfig ];
 
-  meta = {
+  meta = with stdenv.lib; {
+    description = "Library for downloading (streaming) media files using the mmst and mmsh protocols";
     homepage = http://libmms.sourceforge.net;
-    maintainers = [ ];
-    platforms = stdenv.lib.platforms.all;
+    platforms = platforms.all;
+    license = licenses.lgpl21;
   };
 }
diff --git a/pkgs/development/libraries/libmp3splt/default.nix b/pkgs/development/libraries/libmp3splt/default.nix
index af8297e9854..52072000115 100644
--- a/pkgs/development/libraries/libmp3splt/default.nix
+++ b/pkgs/development/libraries/libmp3splt/default.nix
@@ -19,5 +19,6 @@ stdenv.mkDerivation rec {
     description = "Utility to split mp3, ogg vorbis and FLAC files without decoding";
     maintainers = with maintainers; [ bosu ];
     platforms   = platforms.unix;
+    license = licenses.gpl2;
   };
 }
diff --git a/pkgs/development/libraries/libmtp/default.nix b/pkgs/development/libraries/libmtp/default.nix
index c3061626a6a..1d8dd7e20f1 100644
--- a/pkgs/development/libraries/libmtp/default.nix
+++ b/pkgs/development/libraries/libmtp/default.nix
@@ -17,7 +17,7 @@ stdenv.mkDerivation rec {
   # tried to install files to /lib/udev, hopefully OK
   configureFlags = [ "--with-udev=$$bin/lib/udev" ];
 
-  meta = {
+  meta = with stdenv.lib; {
     homepage = http://libmtp.sourceforge.net;
     description = "An implementation of Microsoft's Media Transfer Protocol";
     longDescription = ''
@@ -25,7 +25,7 @@ stdenv.mkDerivation rec {
       in the form of a library suitable primarily for POSIX compliant operating
       systems. We implement MTP Basic, the stuff proposed for standardization.
       '';
-    platforms = stdenv.lib.platforms.unix;
-    maintainers = [ ];
+    platforms = platforms.unix;
+    license = licenses.lgpl21;
   };
 }
diff --git a/pkgs/development/libraries/libmusicbrainz/5.x.nix b/pkgs/development/libraries/libmusicbrainz/5.x.nix
index f197d5bcef9..2b59adf8f92 100644
--- a/pkgs/development/libraries/libmusicbrainz/5.x.nix
+++ b/pkgs/development/libraries/libmusicbrainz/5.x.nix
@@ -16,14 +16,14 @@ stdenv.mkDerivation rec {
 
   dontUseCmakeBuildDir=true;
 
-  meta = {
+  meta = with stdenv.lib; {
     homepage = http://musicbrainz.org/doc/libmusicbrainz;
     description = "MusicBrainz Client Library (5.x version)";
     longDescription = ''
       The libmusicbrainz (also known as mb_client or MusicBrainz Client
       Library) is a development library geared towards developers who wish to
       add MusicBrainz lookup capabilities to their applications.'';
-    maintainers = [ ];
-    platforms = stdenv.lib.platforms.all;
+    platforms = platforms.all;
+    license = licenses.lgpl21;
   };
 }
diff --git a/pkgs/development/libraries/libmusicbrainz/default.nix b/pkgs/development/libraries/libmusicbrainz/default.nix
index 596399c4fa8..5335b6577f0 100644
--- a/pkgs/development/libraries/libmusicbrainz/default.nix
+++ b/pkgs/development/libraries/libmusicbrainz/default.nix
@@ -10,14 +10,14 @@ stdenv.mkDerivation rec {
     sha256 = "1i9qly13bwwmgj68vma766hgvsd1m75236haqsp9zgh5znlmkm3z";
   };
 
-  meta = {
+  meta = with stdenv.lib; {
     homepage = http://musicbrainz.org/doc/libmusicbrainz;
     description = "MusicBrainz Client Library (3.x version)";
     longDescription = ''
       The libmusicbrainz (also known as mb_client or MusicBrainz Client
       Library) is a development library geared towards developers who wish to
       add MusicBrainz lookup capabilities to their applications.'';
-    maintainers = [ ];
-    platforms = stdenv.lib.platforms.all;
+    platforms = platforms.all;
+    license = licenses.lgpl21;
   };
 }
diff --git a/pkgs/development/libraries/libnatspec/default.nix b/pkgs/development/libraries/libnatspec/default.nix
index 9b692e9e3b2..db4f6f5d468 100644
--- a/pkgs/development/libraries/libnatspec/default.nix
+++ b/pkgs/development/libraries/libnatspec/default.nix
@@ -12,11 +12,11 @@ stdenv.mkDerivation (rec {
 
   buildInputs = [ popt ];
 
-  meta = {
+  meta = with stdenv.lib; {
     homepage = http://natspec.sourceforge.net/ ;
     description = "A library intended to smooth national specificities in using of programs";
-    platforms = stdenv.lib.platforms.unix;
-    maintainers = [ ];
+    platforms = platforms.unix;
+    license = licenses.lgpl21;
   };
 } // stdenv.lib.optionalAttrs (!stdenv.isLinux) {
   propagatedBuildInputs = [ libiconv ];
diff --git a/pkgs/development/libraries/libnetfilter_queue/default.nix b/pkgs/development/libraries/libnetfilter_queue/default.nix
index 12a45d088ef..94b3dc90a0b 100644
--- a/pkgs/development/libraries/libnetfilter_queue/default.nix
+++ b/pkgs/development/libraries/libnetfilter_queue/default.nix
@@ -12,10 +12,10 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ pkgconfig ];
   buildInputs = [ libmnl libnfnetlink ];
 
-  meta = {
+  meta = with stdenv.lib; {
     homepage = http://www.netfilter.org/projects/libnetfilter_queue/;
     description = "Userspace API to packets queued by the kernel packet filter";
-
-    platforms = stdenv.lib.platforms.linux;
+    license = licenses.gpl2;
+    platforms = platforms.linux;
   };
 }
diff --git a/pkgs/development/libraries/libnice/default.nix b/pkgs/development/libraries/libnice/default.nix
index 1f58545574c..8582dc4e1d9 100644
--- a/pkgs/development/libraries/libnice/default.nix
+++ b/pkgs/development/libraries/libnice/default.nix
@@ -14,7 +14,7 @@ stdenv.mkDerivation rec {
 
   doCheck = false; # fails with "fatal error: nice/agent.h: No such file or directory"
 
-  meta = {
+  meta = with stdenv.lib; {
     homepage = https://nice.freedesktop.org/wiki/;
     description = "The GLib ICE implementation";
     longDescription = ''
@@ -24,6 +24,7 @@ stdenv.mkDerivation rec {
 
       It provides a GLib-based library, libnice and a Glib-free library,
       libstun as well as GStreamer elements.'';
-    platforms = stdenv.lib.platforms.linux;
+    platforms = platforms.linux;
+    license = with licenses; [ lgpl21 mpl11 ];
   };
 }
diff --git a/pkgs/development/libraries/libnotify/default.nix b/pkgs/development/libraries/libnotify/default.nix
index fbde49a54d0..11f2731eb72 100644
--- a/pkgs/development/libraries/libnotify/default.nix
+++ b/pkgs/development/libraries/libnotify/default.nix
@@ -17,9 +17,10 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ pkgconfig autoreconfHook gobjectIntrospection ];
   buildInputs = [ glib gdk_pixbuf ];
 
-  meta = {
+  meta = with stdenv.lib; {
     homepage = https://developer.gnome.org/notification-spec/;
     description = "A library that sends desktop notifications to a notification daemon";
-    platforms = stdenv.lib.platforms.unix;
+    platforms = platforms.unix;
+    license = licenses.lgpl21;
   };
 }
diff --git a/pkgs/development/libraries/libnova/default.nix b/pkgs/development/libraries/libnova/default.nix
index a66a1a88c74..cb70d803ac0 100644
--- a/pkgs/development/libraries/libnova/default.nix
+++ b/pkgs/development/libraries/libnova/default.nix
@@ -2,15 +2,16 @@
 
 stdenv.mkDerivation rec {
   name = "libnova-0.12.3";
-	
+
   src = fetchurl {
     url = "mirror://sourceforge/libnova/${name}.tar.gz";
     sha256 = "18mkx79gyhccp5zqhf6k66sbhv97s7839sg15534ijajirkhw9dc";
   };
-  
-  meta = {
+
+  meta = with stdenv.lib; {
     description = "Celestial Mechanics, Astrometry and Astrodynamics Library";
     homepage = http://libnova.sf.net;
-    platforms = stdenv.lib.platforms.unix;
+    platforms = platforms.unix;
+    license = licenses.gpl2;
   };
 }
diff --git a/pkgs/development/libraries/liboauth/default.nix b/pkgs/development/libraries/liboauth/default.nix
index 855d921206e..ea792b007ba 100644
--- a/pkgs/development/libraries/liboauth/default.nix
+++ b/pkgs/development/libraries/liboauth/default.nix
@@ -25,6 +25,7 @@ stdenv.mkDerivation rec {
     description = "C library implementing the OAuth secure authentication protocol";
     homepage = http://liboauth.sourceforge.net/;
     repositories.git = https://github.com/x42/liboauth.git;
+    license = licenses.mit;
   };
 
 }
diff --git a/pkgs/development/libraries/libofa/default.nix b/pkgs/development/libraries/libofa/default.nix
index 531e30ba755..8131420cfd6 100644
--- a/pkgs/development/libraries/libofa/default.nix
+++ b/pkgs/development/libraries/libofa/default.nix
@@ -27,12 +27,13 @@ stdenv.mkDerivation rec {
 
   propagatedBuildInputs = [ expat curl fftw ];
 
-  meta = {
+  meta = with stdenv.lib; {
     homepage = https://code.google.com/archive/p/musicip-libofa/;
     description = "Library Open Fingerprint Architecture";
     longDescription = ''
       LibOFA (Library Open Fingerprint Architecture) is an open-source audio
       fingerprint created and provided by MusicIP'';
-    platforms = stdenv.lib.platforms.linux;
+    platforms = platforms.linux;
+    license = licenses.gpl2;
   };
 }
diff --git a/pkgs/development/libraries/liboggz/default.nix b/pkgs/development/libraries/liboggz/default.nix
index f6fe9ecd03a..d7c3b747924 100644
--- a/pkgs/development/libraries/liboggz/default.nix
+++ b/pkgs/development/libraries/liboggz/default.nix
@@ -12,7 +12,7 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ pkgconfig ];
 
-  meta = {
+  meta = with stdenv.lib; {
     homepage = https://xiph.org/oggz/;
     description = "A C library and tools for manipulating with Ogg files and streams";
     longDescription = ''
@@ -27,7 +27,7 @@ stdenv.mkDerivation rec {
       interleaving data container developed by Monty at Xiph.Org, originally to
       support the Ogg Vorbis audio format but now used for many free codecs
       including Dirac, FLAC, Speex and Theora.'';
-    maintainers = [ ];
-    platforms = stdenv.lib.platforms.unix;
+    platforms = platforms.unix;
+    license = licenses.bsd3;
   };
 }
diff --git a/pkgs/development/libraries/libpcap/default.nix b/pkgs/development/libraries/libpcap/default.nix
index f94f327ea02..267859cb217 100644
--- a/pkgs/development/libraries/libpcap/default.nix
+++ b/pkgs/development/libraries/libpcap/default.nix
@@ -50,5 +50,6 @@ stdenv.mkDerivation rec {
     description = "Packet Capture Library";
     platforms = platforms.unix;
     maintainers = with maintainers; [ fpletz ];
+    license = licenses.bsd3;
   };
 }
diff --git a/pkgs/development/libraries/librdf/redland.nix b/pkgs/development/libraries/librdf/redland.nix
index 422ace462a9..30d8d8a94e9 100644
--- a/pkgs/development/libraries/librdf/redland.nix
+++ b/pkgs/development/libraries/librdf/redland.nix
@@ -38,8 +38,10 @@ stdenv.mkDerivation rec {
 
   doCheck = false; # fails 1 out of 17 tests with a segmentation fault
 
-  meta = {
+  meta = with stdenv.lib; {
+    description = "C libraries that provide support for the Resource Description Framework (RDF)";
     homepage = http://librdf.org/;
-    platforms = stdenv.lib.platforms.unix;
+    platforms = platforms.unix;
+    license = licenses.asl20;
   };
 }