lmdb: split outputs and add lmdb.pc

lmdb.a is removed, until someone needs it.

pkgs/development/libraries/lmdb/default.nix

@@ -14,14 +14,28 @@ in stdenv.mkDerivation rec {
 
   postUnpack = "sourceRoot=\${sourceRoot}/libraries/liblmdb";
 
-  makeFlags = ["prefix=$(out)"]
+  outputs = [ "bin" "out" "dev" ];
-              ++ optional stdenv.cc.isClang "CC=clang";
+
+  makeFlags = [ "prefix=$(out)" "CC=cc" ];
 
   doCheck = true;
   checkPhase = "make test";
 
-  preInstall = ''
+  postInstall = ''
-    mkdir -p $out/{bin,lib,include}
+    moveToOutput bin "$bin"
+    moveToOutput "lib/*.a" REMOVE # until someone needs it
+  ''
+    # add lmdb.pc (dynamic only)
+    + ''
+    mkdir -p "$dev/lib/pkgconfig"
+    cat > "$dev/lib/pkgconfig/lmdb.pc" <<EOF
+    Name: lmdb
+    Description: ${meta.description}
+    Version: ${version}
+
+    Cflags: -I$dev/include
+    Libs: -L$out/lib -llmdb
+    EOF
   '';
 
   meta = with stdenv.lib; {
@@ -34,7 +48,7 @@ in stdenv.mkDerivation rec {
       limited to the size of the virtual address space.
     '';
     homepage = http://symas.com/mdb/;
-    maintainers = with maintainers; [ jb55 ];
+    maintainers = with maintainers; [ jb55 vcunat ];
     license = licenses.openldap;
     platforms = platforms.all;
   };