diff --git a/include/cmake_generator.hpp b/include/cmake_generator.hpp
index 13f1e15..5b34632 100644
--- a/include/cmake_generator.hpp
+++ b/include/cmake_generator.hpp
@@ -1,11 +1,13 @@
 #pragma once
 
+#include "project_parser.hpp"
+
 namespace cmkr {
 namespace gen {
 
 int generate_project(const char *typ);
 
-int generate_cmake(const char *path, bool root = true);
+int generate_cmake(const char *path, const parser::Project *parent_project = nullptr);
 
 } // namespace gen
 } // namespace cmkr
diff --git a/include/project_parser.hpp b/include/project_parser.hpp
index e86cd92..2e4392f 100644
--- a/include/project_parser.hpp
+++ b/include/project_parser.hpp
@@ -152,7 +152,7 @@ struct Project {
     tsl::ordered_map<std::string, std::string> conditions;
     std::vector<Subdir> subdirs;
 
-    Project(const std::string &path, bool build);
+    Project(const Project *parent, const std::string &path, bool build);
 };
 
 bool is_root_path(const std::string &path);
diff --git a/src/build.cpp b/src/build.cpp
index b115615..f647746 100644
--- a/src/build.cpp
+++ b/src/build.cpp
@@ -1,7 +1,7 @@
 #include "build.hpp"
-#include "project_parser.hpp"
-#include "error.hpp"
 #include "cmake_generator.hpp"
+#include "error.hpp"
+#include "project_parser.hpp"
 
 #include "fs.hpp"
 #include <sstream>
@@ -14,7 +14,7 @@ namespace cmkr {
 namespace build {
 
 int run(int argc, char **argv) {
-    parser::Project project(".", true);
+    parser::Project project(nullptr, ".", true);
     if (argc > 2) {
         for (int i = 2; i < argc; ++i) {
             project.build_args.push_back(argv[i]);
@@ -50,7 +50,7 @@ int run(int argc, char **argv) {
 
 int clean() {
     bool ret = false;
-    parser::Project project(".", true);
+    parser::Project project(nullptr, ".", true);
     if (fs::exists(project.build_dir)) {
         ret = fs::remove_all(project.build_dir);
         fs::create_directory(project.build_dir);
@@ -59,7 +59,7 @@ int clean() {
 }
 
 int install() {
-    parser::Project project(".", false);
+    parser::Project project(nullptr, ".", false);
     auto cmd = "cmake --install " + project.build_dir;
     return ::system(cmd.c_str());
 }
diff --git a/src/cmake_generator.cpp b/src/cmake_generator.cpp
index b7ff456..470c3c9 100644
--- a/src/cmake_generator.cpp
+++ b/src/cmake_generator.cpp
@@ -1,7 +1,6 @@
 #include "cmake_generator.hpp"
 #include "error.hpp"
 #include "literals.hpp"
-#include "project_parser.hpp"
 
 #include "fs.hpp"
 #include <cassert>
@@ -440,12 +439,12 @@ static std::string vcpkg_escape_identifier(const std::string &name) {
     return escaped;
 }
 
-int generate_cmake(const char *path, bool root) {
+int generate_cmake(const char *path, const parser::Project *parent_project) {
     if (!fs::exists(fs::path(path) / "cmake.toml")) {
         throw std::runtime_error("No cmake.toml found!");
     }
 
-    parser::Project project(path, false);
+    parser::Project project(parent_project, path, false);
     Generator gen(project);
 
     // Helper lambdas for more convenient CMake generation
@@ -461,7 +460,8 @@ int generate_cmake(const char *path, bool root) {
     comment("See " + cmkr_url + " for more information");
     endl();
 
-    if (root) {
+    // Root project doesn't have a parent
+    if (parent_project == nullptr) {
         cmd("cmake_minimum_required")("VERSION", project.cmake_version).endl();
 
         if (!project.allow_in_tree) {
@@ -919,7 +919,7 @@ int generate_cmake(const char *path, bool root) {
         }
     }
 
-    auto generate_subdir = [path](const fs::path &sub) {
+    auto generate_subdir = [path, &project](const fs::path &sub) {
         // Skip generating for subdirectories that have a cmake.toml with a [project] in it
         fs::path subpath;
         for (const auto &p : sub) {
@@ -931,7 +931,7 @@ int generate_cmake(const char *path, bool root) {
 
         subpath = path / sub;
         if (fs::exists(subpath / "cmake.toml")) {
-            generate_cmake(subpath.string().c_str(), false);
+            generate_cmake(subpath.string().c_str(), &project);
         }
     };
     for (const auto &itr : project.project_subdirs) {
diff --git a/src/project_parser.cpp b/src/project_parser.cpp
index 75d4177..bc8d9b6 100644
--- a/src/project_parser.cpp
+++ b/src/project_parser.cpp
@@ -61,7 +61,7 @@ static void get_optional(const TomlBasicValue &v, const toml::key &ky, T &destin
     }
 }
 
-Project::Project(const std::string &path, bool build) {
+Project::Project(const Project *parent, const std::string &path, bool build) {
     const auto toml_path = fs::path(path) / "cmake.toml";
     if (!fs::exists(toml_path)) {
         throw std::runtime_error("No cmake.toml was found!");
@@ -313,14 +313,18 @@ Project::Project(const std::string &path, bool build) {
         }
 
         // Reasonable default conditions (you can override these if you desire)
-        conditions["windows"] = R"cmake(WIN32)cmake";
-        conditions["macos"] = R"cmake(CMAKE_SYSTEM_NAME MATCHES "Darwin")cmake";
-        conditions["unix"] = R"cmake(UNIX)cmake";
-        conditions["bsd"] = R"cmake(CMAKE_SYSTEM_NAME MATCHES "BSD")cmake";
-        conditions["linux"] = conditions["lunix"] = R"cmake(CMAKE_SYSTEM_NAME MATCHES "Linux")cmake";
-        conditions["gcc"] = R"cmake(CMAKE_CXX_COMPILER_ID STREQUAL "GNU" OR CMAKE_C_COMPILER_ID STREQUAL "GNU")cmake";
-        conditions["clang"] = R"cmake(CMAKE_CXX_COMPILER_ID MATCHES "Clang" OR CMAKE_C_COMPILER_ID MATCHES "Clang")cmake";
-        conditions["msvc"] = R"cmake(MSVC)cmake";
+        if (parent == nullptr) {
+            conditions["windows"] = R"cmake(WIN32)cmake";
+            conditions["macos"] = R"cmake(CMAKE_SYSTEM_NAME MATCHES "Darwin")cmake";
+            conditions["unix"] = R"cmake(UNIX)cmake";
+            conditions["bsd"] = R"cmake(CMAKE_SYSTEM_NAME MATCHES "BSD")cmake";
+            conditions["linux"] = conditions["lunix"] = R"cmake(CMAKE_SYSTEM_NAME MATCHES "Linux")cmake";
+            conditions["gcc"] = R"cmake(CMAKE_CXX_COMPILER_ID STREQUAL "GNU" OR CMAKE_C_COMPILER_ID STREQUAL "GNU")cmake";
+            conditions["clang"] = R"cmake(CMAKE_CXX_COMPILER_ID MATCHES "Clang" OR CMAKE_C_COMPILER_ID MATCHES "Clang")cmake";
+            conditions["msvc"] = R"cmake(MSVC)cmake";
+        } else {
+            conditions = parent->conditions;
+        }
 
         if (toml.contains("conditions")) {
             auto conds = toml::find<decltype(conditions)>(toml, "conditions");