diff --git a/src/ast/workspace/mod.rs b/src/ast/workspace/mod.rs
index 09083b3..43ef669 100644
--- a/src/ast/workspace/mod.rs
+++ b/src/ast/workspace/mod.rs
@@ -54,6 +54,7 @@ impl<'a> AstWorkspace<'a> {
             settings.push(Settings {
                 adept_version: AdeptVersion::CURRENT,
                 debug_skip_merging_helper_exprs: false,
+                imported_namespaces: vec![],
             }),
             Self::DEFAULT_SETTINGS_ID.0
         );
@@ -114,6 +115,7 @@ impl<'a> AstWorkspace<'a> {
 pub struct Settings {
     pub adept_version: AdeptVersion,
     pub debug_skip_merging_helper_exprs: bool,
+    pub imported_namespaces: Vec<Box<str>>,
 }
 
 #[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord)]
diff --git a/src/interpreter/syscall_handler.rs b/src/interpreter/syscall_handler.rs
index c452f95..c6f64a5 100644
--- a/src/interpreter/syscall_handler.rs
+++ b/src/interpreter/syscall_handler.rs
@@ -35,6 +35,7 @@ pub struct BuildSystemSyscallHandler {
     pub link_filenames: HashSet<String>,
     pub link_frameworks: HashSet<String>,
     pub debug_skip_merging_helper_exprs: bool,
+    pub imported_namespaces: Vec<Box<str>>,
 }
 
 fn read_cstring(memory: &Memory, value: &Value) -> String {
@@ -66,6 +67,13 @@ impl SyscallHandler for BuildSystemSyscallHandler {
                 println!("{}", read_cstring(memory, &args[0]));
                 Value::Literal(ir::Literal::Void)
             }
+            ir::InterpreterSyscallKind::BuildAddProject => {
+                assert_eq!(args.len(), 2);
+                let name = read_cstring(memory, &args[0]);
+                let kind = ProjectKind::from_u64(args[1].as_u64().unwrap()).unwrap();
+                self.projects.push(Project { name, kind });
+                Value::Literal(ir::Literal::Void)
+            }
             ir::InterpreterSyscallKind::BuildLinkFilename => {
                 assert_eq!(args.len(), 1);
                 self.link_filenames.insert(read_cstring(memory, &args[0]));
@@ -110,11 +118,10 @@ impl SyscallHandler for BuildSystemSyscallHandler {
 
                 Value::Literal(ir::Literal::Void)
             }
-            ir::InterpreterSyscallKind::BuildAddProject => {
-                assert_eq!(args.len(), 2);
-                let name = read_cstring(memory, &args[0]);
-                let kind = ProjectKind::from_u64(args[1].as_u64().unwrap()).unwrap();
-                self.projects.push(Project { name, kind });
+            ir::InterpreterSyscallKind::ImportNamespace => {
+                assert_eq!(args.len(), 1);
+                self.imported_namespaces
+                    .push(read_cstring(memory, &args[0]).into_boxed_str());
                 Value::Literal(ir::Literal::Void)
             }
         }
diff --git a/src/interpreter_env/mod.rs b/src/interpreter_env/mod.rs
index ba02aef..4fce2f5 100644
--- a/src/interpreter_env/mod.rs
+++ b/src/interpreter_env/mod.rs
@@ -145,6 +145,12 @@ pub fn setup_build_system_interpreter_symbols(file: &mut AstFile) {
         InterpreterSyscallKind::Experimental,
     ));
 
+    file.functions.push(thin_cstring_function(
+        "importNamespace",
+        "namespace",
+        InterpreterSyscallKind::ImportNamespace,
+    ));
+
     file.functions.push(Function {
         name: "project".into(),
         parameters: Parameters {
diff --git a/src/ir/mod.rs b/src/ir/mod.rs
index 9ecd2e7..0dd7f26 100644
--- a/src/ir/mod.rs
+++ b/src/ir/mod.rs
@@ -145,6 +145,7 @@ pub enum InterpreterSyscallKind {
     BuildLinkFilename,
     BuildLinkFrameworkName,
     Experimental,
+    ImportNamespace,
 }
 
 #[derive(Clone, Debug)]
diff --git a/src/pragma_section/run.rs b/src/pragma_section/run.rs
index 004fab0..8b82e2f 100644
--- a/src/pragma_section/run.rs
+++ b/src/pragma_section/run.rs
@@ -110,6 +110,7 @@ impl PragmaSection {
         Ok(Settings {
             adept_version,
             debug_skip_merging_helper_exprs: user_settings.debug_skip_merging_helper_exprs,
+            imported_namespaces: user_settings.imported_namespaces,
         })
     }
 }
diff --git a/src/resolve/function_search_ctx.rs b/src/resolve/function_search_ctx.rs
index 1b3259a..8f2e13f 100644
--- a/src/resolve/function_search_ctx.rs
+++ b/src/resolve/function_search_ctx.rs
@@ -17,11 +17,10 @@ pub enum FindFunctionError {
 }
 
 impl FunctionSearchCtx {
-    pub fn new() -> Self {
+    pub fn new(imported_namespaces: Vec<Box<str>>) -> Self {
         Self {
             available: Default::default(),
-            // TODO: Make this value user-specified
-            imported_namespaces: vec!["io".to_string().into_boxed_str()],
+            imported_namespaces,
         }
     }
 
diff --git a/src/resolve/mod.rs b/src/resolve/mod.rs
index 0d42afd..fc6bb55 100644
--- a/src/resolve/mod.rs
+++ b/src/resolve/mod.rs
@@ -281,9 +281,21 @@ pub fn resolve<'a>(
             ctx.jobs
                 .push_back(Job::Regular(*real_file_id, function_i, function_ref));
 
-            let function_search_context = ctx
-                .function_search_ctxs
-                .get_or_insert_with(file_id, || FunctionSearchCtx::new());
+            let imported_namespaces =
+                if let Some(settings) = file.settings.map(|id| &ast_workspace.settings[id.0]) {
+                    Some(&settings.imported_namespaces)
+                } else {
+                    None
+                };
+
+            let function_search_context =
+                ctx.function_search_ctxs.get_or_insert_with(file_id, || {
+                    FunctionSearchCtx::new(
+                        imported_namespaces
+                            .map(|namespaces| namespaces.clone())
+                            .unwrap_or_else(|| vec![]),
+                    )
+                });
 
             function_search_context
                 .available