diff --git a/pkgs/development/compilers/ccl/default.nix b/pkgs/development/compilers/ccl/default.nix
index 30eb528cab71..de6a041871ea 100644
--- a/pkgs/development/compilers/ccl/default.nix
+++ b/pkgs/development/compilers/ccl/default.nix
@@ -1,11 +1,8 @@
 { stdenv, fetchsvn, gcc, glibc, m4, coreutils }:
 
-/* TODO: there are also MacOS, FreeBSD and Windows versions */
-assert stdenv.system == "x86_64-linux" || stdenv.system == "i686-linux"
-  || stdenv.system == "armv7l-linux" || stdenv.system == "armv6l-linux";
-
 let
   options = rec {
+    /* TODO: there are also MacOS, FreeBSD and Windows versions */
     x86_64-linux = {
       arch = "linuxx86";
       sha256 = "04p77n18cw0bc8i66mp2vfrhlliahrx66lm004a3nw3h0mdk0gd8";
@@ -28,6 +25,9 @@ let
   };
   cfg = options.${stdenv.system};
 in
+
+assert builtins.hasAttr stdenv.system options;
+
 stdenv.mkDerivation rec {
   name     = "ccl-${version}";
   version  = "1.10";
@@ -70,11 +70,11 @@ stdenv.mkDerivation rec {
     chmod a+x "$out"/bin/"${CCL_RUNTIME}"
   '';
 
-  meta = {
+  meta = with stdenv.lib; {
     description = "Clozure Common Lisp";
     homepage    = http://ccl.clozure.com/;
-    maintainers = with stdenv.lib.maintainers; [ raskin muflax ];
-    platforms   = stdenv.lib.platforms.linux;
-    license     = stdenv.lib.licenses.lgpl21;
+    maintainers = with maintainers; [ raskin muflax ];
+    platforms   = attrNames options;
+    license     = licenses.lgpl21;
   };
 }
diff --git a/pkgs/development/compilers/sbcl/bootstrap.nix b/pkgs/development/compilers/sbcl/bootstrap.nix
index 8c1a6e27a769..0b5b48e088ee 100644
--- a/pkgs/development/compilers/sbcl/bootstrap.nix
+++ b/pkgs/development/compilers/sbcl/bootstrap.nix
@@ -46,15 +46,15 @@ stdenv.mkDerivation rec {
       --add-flags "--core $out/share/sbcl/sbcl.core"
   '';
 
-  postFixup = if stdenv.isArm then "" else ''
+  postFixup = stdenv.lib.optionalString (!stdenv.isArm) ''
     patchelf --set-interpreter $(cat $NIX_CC/nix-support/dynamic-linker) $out/share/sbcl/sbcl
   '';
 
-  meta = {
+  meta = with stdenv.lib; {
     description = "Lisp compiler";
     homepage = "http://www.sbcl.org";
-    license = "bsd";
-    maintainers = [stdenv.lib.maintainers.raskin];
-    platforms = stdenv.lib.platforms.unix;
+    license = licenses.publicDomain; # and FreeBSD
+    maintainers = [maintainers.raskin];
+    platforms = attrNames options;
   };
 }
diff --git a/pkgs/development/compilers/sbcl/default.nix b/pkgs/development/compilers/sbcl/default.nix
index 534e54f03962..661279db1a90 100644
--- a/pkgs/development/compilers/sbcl/default.nix
+++ b/pkgs/development/compilers/sbcl/default.nix
@@ -72,12 +72,7 @@ stdenv.mkDerivation rec {
     INSTALL_ROOT=$out sh install.sh
   '';
 
-  meta = {
-    description = "Lisp compiler";
-    homepage = http://www.sbcl.org;
-    license = stdenv.lib.licenses.bsd3;
-    maintainers = [stdenv.lib.maintainers.raskin];
-    platforms = stdenv.lib.platforms.all;
+  meta = sbclBootstrap.meta // {
     inherit version;
     updateWalker = true;
   };
diff --git a/pkgs/development/interpreters/picolisp/default.nix b/pkgs/development/interpreters/picolisp/default.nix
index 496a4ff66681..c43a3ce2429b 100644
--- a/pkgs/development/interpreters/picolisp/default.nix
+++ b/pkgs/development/interpreters/picolisp/default.nix
@@ -8,8 +8,8 @@ stdenv.mkDerivation rec {
     url = "http://www.software-lab.de/${name}.tgz";
     sha256 = "01kgyz0lkz36lxvibv07qd06gwdxvvbain9f9cnya7a12kq3009i";
   };
-  buildInputs = if stdenv.is64bit then [ jdk ] else [];
-  patchPhase = if stdenv.isArm then ''
+  buildInputs = optional stdenv.is64bit jdk;
+  patchPhase = optionalString stdenv.isArm ''
     sed -i s/-m32//g Makefile
     cat >>Makefile <<EOF
     ext.o: ext.c
@@ -17,8 +17,7 @@ stdenv.mkDerivation rec {
     ht.o: ht.c
     	\$(CC) \$(CFLAGS) -fPIC -D_OS='"\$(OS)"' \$*.c
     EOF
-  ''
-  else "";
+  '';
   sourceRoot = ''picoLisp/src${optionalString stdenv.is64bit "64"}'';
   installPhase = ''
     cd ..