diff --git a/source/dub/compilers/compiler.d b/source/dub/compilers/compiler.d
index 2eb8a9a..3ecda83 100644
--- a/source/dub/compilers/compiler.d
+++ b/source/dub/compilers/compiler.d
@@ -15,14 +15,12 @@
 import dub.internal.vibecompat.core.log;
 import dub.internal.vibecompat.data.json;
 import dub.internal.vibecompat.inet.path;
-import dub.recipe.packagerecipe : ToolchainRequirements;
 
 import std.algorithm;
 import std.array;
 import std.conv;
 import std.exception;
 import std.process;
-import std.typecons : Flag;
 
 
 /** Returns a compiler handler for a given binary name.
diff --git a/source/dub/compilers/dmd.d b/source/dub/compilers/dmd.d
index e7feeb8..358fef1 100644
--- a/source/dub/compilers/dmd.d
+++ b/source/dub/compilers/dmd.d
@@ -12,7 +12,6 @@
 import dub.internal.utils;
 import dub.internal.vibecompat.core.log;
 import dub.internal.vibecompat.inet.path;
-import dub.recipe.packagerecipe : ToolchainRequirements;
 
 import std.algorithm;
 import std.array;
diff --git a/source/dub/compilers/gdc.d b/source/dub/compilers/gdc.d
index cec2dbc..f8a5a38 100644
--- a/source/dub/compilers/gdc.d
+++ b/source/dub/compilers/gdc.d
@@ -12,7 +12,6 @@
 import dub.internal.utils;
 import dub.internal.vibecompat.core.log;
 import dub.internal.vibecompat.inet.path;
-import dub.recipe.packagerecipe : ToolchainRequirements;
 
 import std.algorithm;
 import std.array;
diff --git a/source/dub/compilers/ldc.d b/source/dub/compilers/ldc.d
index 9170896..bcd3b6a 100644
--- a/source/dub/compilers/ldc.d
+++ b/source/dub/compilers/ldc.d
@@ -12,7 +12,6 @@
 import dub.internal.utils;
 import dub.internal.vibecompat.core.log;
 import dub.internal.vibecompat.inet.path;
-import dub.recipe.packagerecipe : ToolchainRequirements;
 
 import std.algorithm;
 import std.array;
diff --git a/source/dub/dependencyresolver.d b/source/dub/dependencyresolver.d
index eb4462c..8ec82cc 100644
--- a/source/dub/dependencyresolver.d
+++ b/source/dub/dependencyresolver.d
@@ -14,8 +14,7 @@
 import std.array : appender, array, join;
 import std.conv : to;
 import std.exception : enforce;
-import std.typecons : Nullable;
-import std.string : format, indexOf, lastIndexOf;
+import std.string : format, lastIndexOf;
 
 
 /** Resolves dependency graph with multiple configurations per package.