diff --git a/flake-info/src/data/export.rs b/flake-info/src/data/export.rs
index f953814..f48c5ee 100644
--- a/flake-info/src/data/export.rs
+++ b/flake-info/src/data/export.rs
@@ -2,6 +2,7 @@
 /// Additionally, we implement converseions from the two possible input formats, i.e.
 /// Flakes, or Nixpkgs.
 use std::{
+    collections::HashSet,
     convert::{TryFrom, TryInto},
     path::PathBuf,
 };
@@ -11,7 +12,6 @@ use serde::{Deserialize, Serialize};
 use super::{
     import::{self, DocString, DocValue, ModulePath, NixOption},
     pandoc::PandocExt,
-    system::System,
     utility::{AttributeQuery, Flatten, OneOrMany, Reverse},
 };
 
@@ -65,7 +65,7 @@ pub enum Derivation {
         package_pname: String,
         package_pname_reverse: Reverse<String>,
         package_pversion: String,
-        package_platforms: Vec<System>,
+        package_platforms: Vec<String>,
         package_outputs: Vec<String>,
         package_default_output: Option<String>,
         package_license: Vec<License>,
@@ -84,7 +84,7 @@ pub enum Derivation {
     #[serde(rename = "app")]
     App {
         app_attr_name: String,
-        app_platforms: Vec<System>,
+        app_platforms: Vec<String>,
 
         app_type: Option<String>,
 
@@ -213,8 +213,7 @@ impl TryFrom<import::NixpkgsEntry> for Derivation {
                 let package_license: Vec<License> = package
                     .meta
                     .license
-                    .map(OneOrMany::into_list)
-                    .unwrap_or_default()
+                    .map_or(Default::default(), OneOrMany::into_list)
                     .into_iter()
                     .map(|sos| sos.0.into())
                     .collect();
@@ -224,6 +223,23 @@ impl TryFrom<import::NixpkgsEntry> for Derivation {
                     .map(|l: &License| l.fullName.to_owned())
                     .collect();
 
+                let platforms: HashSet<String> = package
+                    .meta
+                    .platforms
+                    .map_or(Default::default(), Flatten::flatten)
+                    .into_iter()
+                    .collect();
+
+                let bad_platforms: HashSet<String> = package
+                    .meta
+                    .bad_platforms
+                    .map_or(Default::default(), Flatten::flatten)
+                    .into_iter()
+                    .collect();
+
+                let platforms: Vec<String> =
+                    platforms.difference(&bad_platforms).cloned().collect();
+
                 let package_maintainers: Vec<Maintainer> = package
                     .meta
                     .maintainers
@@ -261,11 +277,7 @@ impl TryFrom<import::NixpkgsEntry> for Derivation {
                     package_pname: package.pname.clone(),
                     package_pname_reverse: Reverse(package.pname),
                     package_pversion: package.version,
-                    package_platforms: package
-                        .meta
-                        .platforms
-                        .map(Flatten::flatten)
-                        .unwrap_or_default(),
+                    package_platforms: platforms,
                     package_outputs: package.outputs.into_keys().collect(),
                     package_default_output: package.default_output,
                     package_license,
diff --git a/flake-info/src/data/import.rs b/flake-info/src/data/import.rs
index 4e11c0a..eef11b3 100644
--- a/flake-info/src/data/import.rs
+++ b/flake-info/src/data/import.rs
@@ -11,7 +11,6 @@ use serde_json::Value;
 
 use super::pandoc::PandocExt;
 use super::prettyprint::print_value;
-use super::system::System;
 use super::utility::{Flatten, OneOrMany};
 
 /// Holds information about a specific derivation
@@ -27,7 +26,7 @@ pub enum FlakeEntry {
         attribute_name: String,
         name: String,
         version: String,
-        platforms: Vec<System>,
+        platforms: Vec<String>,
         outputs: Vec<String>,
         default_output: String,
         description: Option<String>,
@@ -37,7 +36,7 @@ pub enum FlakeEntry {
     App {
         bin: Option<PathBuf>,
         attribute_name: String,
-        platforms: Vec<System>,
+        platforms: Vec<String>,
         app_type: Option<String>,
     },
     /// an option defined in a module of a flake
@@ -189,7 +188,9 @@ pub struct Meta {
     pub license: Option<OneOrMany<StringOrStruct<License>>>,
     pub maintainers: Option<Flatten<Maintainer>>,
     pub homepage: Option<OneOrMany<String>>,
-    pub platforms: Option<Flatten<System>>,
+    pub platforms: Option<Flatten<String>>,
+    #[serde(rename = "badPlatforms")]
+    pub bad_platforms: Option<Flatten<String>>,
     pub position: Option<String>,
     pub description: Option<String>,
     #[serde(rename = "longDescription")]
diff --git a/flake-info/src/data/mod.rs b/flake-info/src/data/mod.rs
index 2915a92..a72de5d 100644
--- a/flake-info/src/data/mod.rs
+++ b/flake-info/src/data/mod.rs
@@ -4,7 +4,6 @@ pub mod import;
 mod pandoc;
 mod prettyprint;
 mod source;
-mod system;
 mod utility;
 
 pub use export::Export;
diff --git a/flake-info/src/data/system.rs b/flake-info/src/data/system.rs
deleted file mode 100644
index 1ebe319..0000000
--- a/flake-info/src/data/system.rs
+++ /dev/null
@@ -1,33 +0,0 @@
-use serde::{Deserialize, Serialize};
-
-#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
-#[serde(untagged)]
-pub enum System {
-    Plain(String),
-    Detailed { cpu: Cpu, kernel: Kernel },
-}
-
-#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
-pub struct Cpu {
-    family: String,
-}
-
-#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
-pub struct Kernel {
-    name: String,
-}
-
-impl ToString for System {
-    fn to_string(&self) -> String {
-        match self {
-            System::Plain(system) => system.to_owned(),
-            System::Detailed { cpu, kernel } => format!("{}-{}", cpu.family, kernel.name),
-        }
-    }
-}
-
-#[derive(Debug, PartialEq, Serialize, Deserialize)]
-pub struct InstancePlatform {
-    system: System,
-    version: String,
-}