diff --git a/src/tasks/boost.cpp b/src/tasks/boost.cpp
index bd97c27..e77f5cd 100644
--- a/src/tasks/boost.cpp
+++ b/src/tasks/boost.cpp
@@ -1,5 +1,6 @@
 #include "pch.h"
 #include "tasks.h"
+#include "../core/process.h"
 
 namespace mob
 {
diff --git a/src/tasks/ncc.cpp b/src/tasks/ncc.cpp
index 417ac4f..4af1302 100644
--- a/src/tasks/ncc.cpp
+++ b/src/tasks/ncc.cpp
@@ -1,5 +1,6 @@
 #include "pch.h"
 #include "tasks.h"
+#include "../core/process.h"
 
 namespace mob
 {
diff --git a/src/tasks/openssl.cpp b/src/tasks/openssl.cpp
index 91b43e3..5c85b3e 100644
--- a/src/tasks/openssl.cpp
+++ b/src/tasks/openssl.cpp
@@ -1,5 +1,6 @@
 #include "pch.h"
 #include "tasks.h"
+#include "../core/process.h"
 
 namespace mob
 {
diff --git a/src/tasks/pyqt.cpp b/src/tasks/pyqt.cpp
index d156aed..102faa2 100644
--- a/src/tasks/pyqt.cpp
+++ b/src/tasks/pyqt.cpp
@@ -1,5 +1,6 @@
 #include "pch.h"
 #include "tasks.h"
+#include "../core/process.h"
 
 namespace mob
 {
diff --git a/src/tasks/python.cpp b/src/tasks/python.cpp
index 59e3bd7..6b84f1c 100644
--- a/src/tasks/python.cpp
+++ b/src/tasks/python.cpp
@@ -1,5 +1,6 @@
 #include "pch.h"
 #include "tasks.h"
+#include "../core/process.h"
 
 namespace mob
 {
diff --git a/src/tasks/sip.cpp b/src/tasks/sip.cpp
index 98875a6..00c6e56 100644
--- a/src/tasks/sip.cpp
+++ b/src/tasks/sip.cpp
@@ -1,5 +1,6 @@
 #include "pch.h"
 #include "tasks.h"
+#include "../core/process.h"
 
 namespace mob
 {
diff --git a/src/tasks/translations.cpp b/src/tasks/translations.cpp
index 0bee069..e61191e 100644
--- a/src/tasks/translations.cpp
+++ b/src/tasks/translations.cpp
@@ -1,5 +1,6 @@
 #include "pch.h"
 #include "tasks.h"
+#include "../core/env.h"
 #include "../utility/threading.h"
 
 namespace mob
diff --git a/src/tools/cmake.cpp b/src/tools/cmake.cpp
index 5d6e027..34a1e4b 100644
--- a/src/tools/cmake.cpp
+++ b/src/tools/cmake.cpp
@@ -1,5 +1,6 @@
 #include "pch.h"
 #include "tools.h"
+#include "../core/process.h"
 
 namespace mob
 {
@@ -46,7 +47,7 @@ cmake& cmake::prefix(const fs::path& s)
 
 cmake& cmake::def(const std::string& name, const std::string& value)
 {
-	process_.arg("-D" + name + "=" + value + "");
+	def_.emplace_back(name, value);
 	return *this;
 }
 
@@ -119,7 +120,7 @@ void cmake::do_generate()
 
 	const auto& g = get_generator(gen_);
 
-	process_
+	auto p = process()
 		.stdout_encoding(encodings::utf8)
 		.stderr_encoding(encodings::utf8)
 		.binary(binary())
@@ -130,29 +131,33 @@ void cmake::do_generate()
 
 	if (genstring_.empty())
 	{
-		process_
+		p
 			.arg("-G", "\"" + g.name + "\"")
 			.arg(g.get_arch(arch_));
 	}
 	else
 	{
-		process_
+		p
 			.arg("-G", "\"" + genstring_ + "\"");
 	}
 
 	if (!prefix_.empty())
-		process_.arg("-DCMAKE_INSTALL_PREFIX=", prefix_, process::nospace);
+		p.arg("-DCMAKE_INSTALL_PREFIX=", prefix_, process::nospace);
+
+	for (auto&& [name, value] : def_)
+		p.arg("-D" + name + "=" + value + "");
 
 	if (cmd_.empty())
-		process_.arg("..");
+		p.arg("..");
 	else
-		process_.arg(cmd_);
+		p.arg(cmd_);
 
-	process_
+	p
 		.env(env::vs(arch_)
 			.set("CXXFLAGS", "/wd4566"))
 		.cwd(build_path());
 
+	set_process(p);
 	execute_and_join();
 }
 
diff --git a/src/tools/extractor.cpp b/src/tools/extractor.cpp
index 6510e48..ebb7a63 100644
--- a/src/tools/extractor.cpp
+++ b/src/tools/extractor.cpp
@@ -1,5 +1,6 @@
 #include "pch.h"
 #include "tools.h"
+#include "../core/process.h"
 
 namespace mob
 {
@@ -89,18 +90,18 @@ void extractor::do_run()
 			.arg("-ttar")
 			.arg("-o", where_, process::nospace);
 
-		process_ = process::pipe(extract_tar, extract_gz);
+		set_process(process::pipe(extract_tar, extract_gz));
 	}
 	else
 	{
-		process_ = process()
+		set_process(process()
 			.binary(binary())
 			.arg("x")
 			.arg("-aoa")
 			.arg("-bd")
 			.arg("-bb0")
 			.arg("-o", where_, process::nospace)
-			.arg(file_);
+			.arg(file_));
 	}
 
 	execute_and_join();
diff --git a/src/tools/git.cpp b/src/tools/git.cpp
index 5ee623f..aff3620 100644
--- a/src/tools/git.cpp
+++ b/src/tools/git.cpp
@@ -1,6 +1,7 @@
 #include "pch.h"
 #include "tools.h"
 #include "../core/conf.h"
+#include "../core/process.h"
 #include "../utility/threading.h"
 
 namespace mob
@@ -130,12 +131,12 @@ void git::apply(const fs::path& p, const std::string& diff)
 
 void git::apply(const std::string& diff)
 {
-	process_ = make_process()
+	set_process(make_process()
 		.stdin_string(diff)
 		.arg("apply")
 		.arg("--whitespace", "nowarn")
 		.arg("-")
-		.cwd(root_);
+		.cwd(root_));
 
 	execute_and_join();
 }
@@ -150,12 +151,12 @@ void git::fetch(
 
 void git::fetch(const std::string& remote, const std::string& branch)
 {
-	process_ = make_process()
+	set_process(make_process()
 		.arg("fetch")
 		.arg("-q")
 		.arg(remote)
 		.arg(branch)
-		.cwd(root_);
+		.cwd(root_));
 
 	execute_and_join();
 }
@@ -169,12 +170,12 @@ void git::checkout(const fs::path& p, const std::string& what)
 
 void git::checkout(const std::string& what)
 {
-	process_ = make_process()
+	set_process(make_process()
 		.arg("-c", "advice.detachedHead=false")
 		.arg("checkout")
 		.arg("-q")
 		.arg(what)
-		.cwd(root_);
+		.cwd(root_));
 
 	execute_and_join();
 }
@@ -188,15 +189,15 @@ std::string git::current_branch(const fs::path& p)
 
 std::string git::current_branch()
 {
-	process_ = make_process()
+	set_process(make_process()
 		.stdout_flags(process::keep_in_string)
 		.arg("branch")
 		.arg("--show-current")
-		.cwd(root_);
+		.cwd(root_));
 
 	execute_and_join();
 
-	return trim_copy(process_.stdout_string());
+	return trim_copy(get_process().stdout_string());
 }
 
 fs::path git::binary()
@@ -327,7 +328,7 @@ process git::make_process()
 
 void git::do_add_submodule()
 {
-	process_ = make_process()
+	set_process(make_process()
 		.stderr_level(context::level::trace)
 		.arg("-c", "core.autocrlf=false")
 		.arg("submodule")
@@ -338,7 +339,7 @@ void git::do_add_submodule()
 		.arg("--name", submodule_)
 		.arg(url_)
 		.arg(submodule_)
-		.cwd(root_);
+		.cwd(root_));
 
 	execute_and_join();
 }
@@ -358,21 +359,22 @@ bool git::do_clone()
 		return false;
 	}
 
-	process_ = make_process()
+	auto p = make_process()
 		.stderr_level(context::level::trace)
 		.arg("clone")
 		.arg("--recurse-submodules");
 
 	if (shallow_)
-		process_.arg("--depth", "1");
+		p.arg("--depth", "1");
 
-	process_
+	p
 		.arg("--branch", branch_)
 		.arg("--quiet", process::log_quiet)
 		.arg("-c", "advice.detachedHead=false", process::log_quiet)
 		.arg(url_)
 		.arg(root_);
 
+	set_process(p);
 	execute_and_join();
 
 
@@ -393,14 +395,14 @@ void git::do_pull()
 	if (revert_ts_)
 		do_revert_ts();
 
-	process_ = make_process()
+	set_process(make_process()
 		.stderr_level(context::level::trace)
 		.arg("pull")
 		.arg("--recurse-submodules")
 		.arg("--quiet", process::log_quiet)
 		.arg(url_)
 		.arg(branch_)
-		.cwd(root_);
+		.cwd(root_));
 
 	execute_and_join();
 }
@@ -489,11 +491,11 @@ void git::do_revert_ts()
 			return;
 		}
 
-		process_ = make_process()
+		set_process(make_process()
 			.stderr_level(context::level::trace)
 			.arg("checkout")
 			.arg(p)
-			.cwd(root_);
+			.cwd(root_));
 
 		execute_and_join();
 	});
@@ -501,93 +503,93 @@ void git::do_revert_ts()
 
 void git::set_config(const std::string& key, const std::string& value)
 {
-	process_ = make_process()
+	set_process(make_process()
 		.stderr_level(context::level::trace)
 		.arg("config")
 		.arg(key)
 		.arg(value)
-		.cwd(root_);
+		.cwd(root_));
 
 	execute_and_join();
 }
 
 bool git::has_remote(const std::string& name)
 {
-	process_ = make_process()
+	set_process(make_process()
 		.flags(process::allow_failure)
 		.stderr_level(context::level::debug)
 		.arg("config")
 		.arg("remote." + name + ".url")
-		.cwd(root_);
+		.cwd(root_));
 
 	return (execute_and_join() == 0);
 }
 
 void git::rename_remote(const std::string& from, const std::string& to)
 {
-	process_ = make_process()
+	set_process(make_process()
 		.arg("remote")
 		.arg("rename")
 		.arg(from)
 		.arg(to)
-		.cwd(root_);
+		.cwd(root_));
 
 	execute_and_join();
 }
 
 void git::add_remote(const std::string& name, const std::string& url)
 {
-	process_ = make_process()
+	set_process(make_process()
 		.arg("remote")
 		.arg("add")
 		.arg(name)
 		.arg(url)
-		.cwd(root_);
+		.cwd(root_));
 
 	execute_and_join();
 }
 
 void git::set_remote_push(const std::string& remote, const std::string& url)
 {
-	process_ = make_process()
+	set_process(make_process()
 		.arg("remote")
 		.arg("set-url")
 		.arg("--push")
 		.arg(remote)
 		.arg(url)
-		.cwd(root_);
+		.cwd(root_));
 
 	execute_and_join();
 }
 
 void git::set_assume_unchanged(const fs::path& relative_file, bool on)
 {
-	process_ = make_process()
+	set_process(make_process()
 		.arg("update-index")
 		.arg(on ? "--assume-unchanged" : "--no-assume-unchanged")
 		.arg(relative_file, process::forward_slashes)
-		.cwd(root_);
+		.cwd(root_));
 
 	execute_and_join();
 }
 
 bool git::is_tracked(const fs::path& relative_file)
 {
-	process_ = make_process()
+	set_process(make_process()
 		.stdout_level(context::level::debug)
 		.stderr_level(context::level::debug)
 		.flags(process::allow_failure)
 		.arg("ls-files")
 		.arg("--error-unmatch")
 		.arg(relative_file, process::forward_slashes)
-		.cwd(root_);
+		.cwd(root_));
 
 	return (execute_and_join() == 0);
 }
 
 bool git::is_repo()
 {
-	process_ = make_process()
+	set_process(make_process()
 		.arg("rev-parse")
 		.arg("--is-inside-work-tree")
 		.stderr_filter([](process::filter& f)
@@ -596,71 +598,71 @@ bool git::is_repo()
 				f.lv = context::level::trace;
 		})
 		.flags(process::allow_failure)
-		.cwd(root_);
+		.cwd(root_));
 
 	return (execute_and_join() == 0);
 }
 
 bool git::branch_exists()
 {
-	process_ = make_process()
+	set_process(make_process()
 		.flags(process::allow_failure)
 		.arg("ls-remote")
 		.arg("--exit-code")
 		.arg("--heads")
 		.arg(url_)
-		.arg(branch_);
+		.arg(branch_));
 
 	return (execute_and_join() == 0);
 }
 
 bool git::has_uncommitted_changes()
 {
-	process_ = make_process()
+	set_process(make_process()
 		.flags(process::allow_failure)
 		.stdout_flags(process::keep_in_string)
 		.arg("status")
 		.arg("-s")
 		.arg("--porcelain")
-		.cwd(root_);
+		.cwd(root_));
 
 	execute_and_join();
 
-	return (process_.stdout_string() != "");
+	return (get_process().stdout_string() != "");
 }
 
 bool git::has_stashed_changes()
 {
-	process_ = make_process()
+	set_process(make_process()
 		.flags(process::allow_failure)
 		.stderr_level(context::level::trace)
 		.arg("stash show")
-		.cwd(root_);
+		.cwd(root_));
 
 	return (execute_and_join() == 0);
 }
 
 void git::init()
 {
-	process_ = make_process()
+	set_process(make_process()
 		.arg("init")
-		.cwd(root_);
+		.cwd(root_));
 
 	execute_and_join();
 }
 
 std::string git::git_file()
 {
-	process_ = make_process()
+	set_process(make_process()
 		.stdout_flags(process::keep_in_string)
 		.arg("remote")
 		.arg("get-url")
 		.arg("origin")
-		.cwd(root_);
+		.cwd(root_));
 
 	execute_and_join();
 
-	const std::string out = process_.stdout_string();
+	const std::string out = get_process().stdout_string();
 
 	const auto last_slash = out.find_last_of("/");
 	if (last_slash == std::string::npos)
diff --git a/src/tools/jom.cpp b/src/tools/jom.cpp
index 45426c0..b4163e5 100644
--- a/src/tools/jom.cpp
+++ b/src/tools/jom.cpp
@@ -1,6 +1,7 @@
 #include "pch.h"
 #include "tools.h"
 #include "../core/conf.h"
+#include "../core/process.h"
 
 namespace mob
 {
@@ -17,7 +18,7 @@ fs::path jom::binary()
 
 jom& jom::path(const fs::path& p)
 {
-	process_.cwd(p);
+	cwd_ = p;
 	return *this;
 }
 
@@ -29,7 +30,7 @@ jom& jom::target(const std::string& s)
 
 jom& jom::def(const std::string& s)
 {
-	process_.arg(s);
+	def_.push_back(s);
 	return *this;
 }
 
@@ -52,15 +53,18 @@ int jom::result() const
 
 void jom::do_run()
 {
+	process p;
+
 	process::flags_t pflags = process::terminate_on_interrupt;
 	if (flags_ & allow_failure)
 	{
-		process_.stderr_level(context::level::trace);
+		p.stderr_level(context::level::trace);
 		pflags |= process::allow_failure;
 	}
 
-	process_
+	p
 		.binary(binary())
+		.cwd(cwd_)
 		.stderr_filter([](process::filter& f)
 		{
 			if (f.line.find("empower your cores") != std::string::npos)
@@ -75,13 +79,17 @@ void jom::do_run()
 		.arg("/K");
 
 	if (flags_ & single_job)
-		process_.arg("/J", "1");
+		p.arg("/J", "1");
 
-	process_
+	for (auto&& def : def_)
+		p.arg(def);
+
+	p
 		.arg(target_)
 		.flags(pflags)
 		.env(env::vs(arch_));
 
+	set_process(p);
 	execute_and_join();
 }
 
diff --git a/src/tools/msbuild.cpp b/src/tools/msbuild.cpp
index 3c23ad5..22d6d91 100644
--- a/src/tools/msbuild.cpp
+++ b/src/tools/msbuild.cpp
@@ -1,10 +1,21 @@
 #include "pch.h"
 #include "tools.h"
 #include "../core/conf.h"
+#include "../core/process.h"
 
 namespace mob
 {
 
+void error_filter(process::filter& f)
+{
+	// ": error C2065"
+	// ": error MSB1009"
+	static std::regex re(": error [A-Z]");
+	if (std::regex_search(f.line.begin(), f.line.end(), re))
+		f.lv = context::level::error;
+}
+
+
 msbuild::msbuild(ops o) :
 	basic_process_runner("msbuild"),
 	op_(o), config_("Release"), arch_(arch::def), flags_(noflags)
@@ -127,18 +138,19 @@ void msbuild::do_run(const std::vector<std::string>& targets)
 	}
 
 	process::flags_t pflags = process::noflags;
+	process p;
 
 	if (is_set(flags_, allow_failure))
 	{
-		process_.stderr_level(context::level::trace);
+		p.stderr_level(context::level::trace);
 		pflags |= process::allow_failure;
 	}
 	else
 	{
-		process_.stdout_filter([&](auto& f){ error_filter(f); });
+		p.stdout_filter([&](auto& f){ error_filter(f); });
 	}
 
-	process_
+	p
 		.binary(binary())
 		.chcp(65001)
 		.stdout_encoding(encodings::utf8)
@@ -147,13 +159,13 @@ void msbuild::do_run(const std::vector<std::string>& targets)
 
 	if (!is_set(flags_, single_job))
 	{
-		process_
+		p
 			.arg("-maxCpuCount")
 			.arg("-property:UseMultiToolTask=true")
 			.arg("-property:EnforceProcessCountAcrossBuilds=true");
 	}
 
-	process_
+	p
 		.arg("-property:Configuration=", config_, process::quote)
 		.arg("-property:PlatformToolset=" + toolset)
 		.arg("-property:WindowsTargetPlatformVersion=" + vs::sdk())
@@ -163,22 +175,23 @@ void msbuild::do_run(const std::vector<std::string>& targets)
 		.arg("-consoleLoggerParameters:ErrorsOnly", process::log_quiet);
 
 	if (!targets.empty())
-		process_.arg("-target:" + mob::join(targets, ";"));
+		p.arg("-target:" + mob::join(targets, ";"));
 
-	for (auto&& p : params_)
-		process_.arg("-property:" + p);
+	for (auto&& param : params_)
+		p.arg("-property:" + param);
 
 	env e = env::vs(arch_);
 
-	for (auto&& p : prepend_path_)
-		e.prepend_path(p);
+	for (auto&& path : prepend_path_)
+		e.prepend_path(path);
 
-	process_
+	p
 		.arg(sln_)
 		.flags(pflags)
 		.cwd(sln_.parent_path())
 		.env(e);
 
+	set_process(p);
 	execute_and_join();
 }
 
@@ -188,13 +201,4 @@ void msbuild::do_clean()
 	do_run(map(targets_, [&](auto&& t){ return t + ":Clean"; }));
 }
 
-void msbuild::error_filter(process::filter& f) const
-{
-	// ": error C2065"
-	// ": error MSB1009"
-	static std::regex re(": error [A-Z]");
-	if (std::regex_search(f.line.begin(), f.line.end(), re))
-		f.lv = context::level::error;
-}
-
 }	// namespace
diff --git a/src/tools/patcher.cpp b/src/tools/patcher.cpp
index 27d6916..bffb138 100644
--- a/src/tools/patcher.cpp
+++ b/src/tools/patcher.cpp
@@ -1,6 +1,7 @@
 #include "pch.h"
 #include "tools.h"
 #include "../core/conf.h"
+#include "../core/process.h"
 
 namespace mob
 {
@@ -129,7 +130,7 @@ void patcher::do_patch(const fs::path& patch_file)
 		cx().trace(context::generic,
 			"checking if already patched");
 
-		process_ = check;
+		set_process(check);
 		const auto ret = execute_and_join();
 
 		if (ret == 0)
@@ -154,7 +155,7 @@ void patcher::do_patch(const fs::path& patch_file)
 		// apply
 
 		cx().trace(context::generic, "applying patch {}", patch_file);
-		process_ = apply;
+		set_process(apply);
 		execute_and_join();
 	}
 }
diff --git a/src/tools/process_runner.cpp b/src/tools/process_runner.cpp
index 53cdbcc..4de5c11 100644
--- a/src/tools/process_runner.cpp
+++ b/src/tools/process_runner.cpp
@@ -1,43 +1,58 @@
 #include "pch.h"
 #include "tools.h"
 #include "../core/conf.h"
+#include "../core/process.h"
 
 namespace mob
 {
 
 basic_process_runner::basic_process_runner(std::string name)
-	: tool(std::move(name))
+	: tool(std::move(name)), process_(new process)
 {
 }
 
+basic_process_runner::basic_process_runner(basic_process_runner&& r) = default;
+
+basic_process_runner::~basic_process_runner() = default;
+
+void basic_process_runner::set_process(const process& p)
+{
+	process_.reset(new process(p));
+}
+
+process& basic_process_runner::get_process()
+{
+	return *process_;
+}
+
 void basic_process_runner::do_interrupt()
 {
-	process_.interrupt();
+	process_->interrupt();
 }
 
 int basic_process_runner::execute_and_join()
 {
-	set_name(process_.name());
-	process_.set_context(&cx());
-	process_.run();
+	set_name(process_->name());
+	process_->set_context(&cx());
+	process_->run();
 	join();
 
-	return process_.exit_code();
+	return process_->exit_code();
 }
 
 void basic_process_runner::join()
 {
-	process_.join();
+	process_->join();
 }
 
 int basic_process_runner::exit_code() const
 {
-	return process_.exit_code();
+	return process_->exit_code();
 }
 
 
 process_runner::process_runner(process&& p)
-	: tool(p.name()), own_(std::move(p)), p_(nullptr)
+	: tool(p.name()), own_(new process(std::move(p))), p_(nullptr)
 {
 }
 
@@ -46,6 +61,8 @@ process_runner::process_runner(process& p)
 {
 }
 
+process_runner::~process_runner() = default;
+
 void process_runner::do_run()
 {
 	execute_and_join();
@@ -87,7 +104,7 @@ process& process_runner::real_process()
 	if (p_)
 		return *p_;
 	else
-		return own_;
+		return *own_;
 }
 
 const process& process_runner::real_process() const
@@ -95,7 +112,7 @@ const process& process_runner::real_process() const
 	if (p_)
 		return *p_;
 	else
-		return own_;
+		return *own_;
 }
 
 }	// namespace
diff --git a/src/tools/tools.cpp b/src/tools/tools.cpp
index e74599f..d6cd95b 100644
--- a/src/tools/tools.cpp
+++ b/src/tools/tools.cpp
@@ -3,6 +3,7 @@
 #include "../utility.h"
 #include "../core/op.h"
 #include "../core/conf.h"
+#include "../core/process.h"
 #include "../tasks/tasks.h"
 
 namespace mob
@@ -177,11 +178,11 @@ void vs::do_upgrade()
 		return;
 	}
 
-	process_
+	set_process(process()
 		.binary(devenv_binary())
 		.env(env::vs(arch::x64))
 		.arg("/upgrade")
-		.arg(sln_);
+		.arg(sln_));
 
 	execute_and_join();
 }
@@ -190,11 +191,11 @@ void vs::do_upgrade()
 nuget::nuget(fs::path sln)
 	: basic_process_runner("nuget"), sln_(std::move(sln))
 {
-	process_
+	set_process(process()
 		.binary(binary())
 		.arg("restore")
 		.arg(sln_)
-		.cwd(sln_.parent_path());
+		.cwd(sln_.parent_path()));
 }
 
 fs::path nuget::binary()
@@ -233,7 +234,7 @@ pip_install& pip_install::file(const fs::path& p)
 
 void pip_install::do_run()
 {
-	process_
+	auto p = process()
 		.binary(python::python_exe())
 		.chcp(65001)
 		.stdout_encoding(encodings::utf8)
@@ -245,14 +246,15 @@ void pip_install::do_run()
 		.arg("--disable-pip-version-check");
 
 	if (!package_.empty())
-		process_.arg(package_ + "==" + version_);
+		p.arg(package_ + "==" + version_);
 	else if (!file_.empty())
-		process_.arg(file_);
+		p.arg(file_);
 
-	process_
+	p
 		.env(this_env::get()
 			.set("PYTHONUTF8", "1"));
 
+	set_process(p);
 	execute_and_join();
 }
 
@@ -331,13 +333,13 @@ void transifex::do_init()
 
 	// exit code is 2 when the directory already contains a .tx
 
-	process_ = process()
+	set_process(process()
 		.binary(binary())
 		.success_exit_codes({0, 2})
 		.flags(process::ignore_output_on_success)
 		.arg("init")
 		.arg("--no-interactive")
-		.cwd(root_);
+		.cwd(root_));
 
 	execute_and_join();
 }
@@ -349,7 +351,7 @@ void transifex::do_config()
 
 	op::create_directories(cx(), root_, op::unsafe);
 
-	process_ = process()
+	set_process(process()
 		.binary(binary())
 		.stdout_level(stdout_)
 		.arg("config")
@@ -357,7 +359,7 @@ void transifex::do_config()
 		.arg(url_)
 		.env(this_env::get()
 			.set("TX_TOKEN", key_))
-		.cwd(root_);
+		.cwd(root_));
 
 	execute_and_join();
 }
@@ -366,7 +368,7 @@ void transifex::do_pull()
 {
 	op::create_directories(cx(), root_, op::unsafe);
 
-	process_ = process()
+	auto p = process()
 		.binary(binary())
 		.stdout_level(stdout_)
 		.arg("pull")
@@ -379,8 +381,9 @@ void transifex::do_pull()
 		.cwd(root_);
 
 	if (force_)
-		process_.arg("--force");
+		p.arg("--force");
 
+	set_process(p);
 	execute_and_join();
 }
 
@@ -438,7 +441,7 @@ void lrelease::do_run()
 {
 	const auto qm = qm_file();
 
-	process_ = process()
+	auto p = process()
 		.binary(binary())
 		.arg("-silent")
 		.stderr_filter([](auto&& f)
@@ -451,11 +454,12 @@ void lrelease::do_run()
 
 
 	for (auto&& s : sources_)
-		process_.arg(s);
+		p.arg(s);
 
-	process_
+	p
 		.arg("-qm", (out_ / qm));
 
+	set_process(p);
 	execute_and_join();
 }
 
@@ -481,9 +485,9 @@ void iscc::do_run()
 	if (iss_.empty())
 		cx().bail_out(context::generic, "iscc missing iss file");
 
-	process_
+	set_process(process()
 		.binary(binary())
-		.arg(iss_);
+		.arg(iss_));
 
 	execute_and_join();
 }
diff --git a/src/tools/tools.h b/src/tools/tools.h
index 9001763..2b1c3bd 100644
--- a/src/tools/tools.h
+++ b/src/tools/tools.h
@@ -1,7 +1,6 @@
 #pragma once
 
 #include "../net.h"
-#include "../core/process.h"
 #include "../core/conf.h"
 #include "../core/op.h"
 #include "../core/context.h"
@@ -9,6 +8,8 @@
 namespace mob
 {
 
+class process;
+
 class tool
 {
 public:
@@ -100,16 +101,24 @@ private:
 class basic_process_runner : public tool
 {
 public:
+	// anchors
+	basic_process_runner(basic_process_runner&&);
+	~basic_process_runner();
+
 	void join();
 	int exit_code() const;
 
 protected:
-	process process_;
-
 	basic_process_runner(std::string name);
 
+	void set_process(const process& p);
+	process& get_process();
+
 	void do_interrupt() override;
 	int execute_and_join();
+
+private:
+	std::unique_ptr<process> process_;
 };
 
 
@@ -119,6 +128,9 @@ public:
 	process_runner(process&& p);
 	process_runner(process& p);
 
+	// anchor
+	~process_runner();
+
 	void join();
 	int exit_code() const;
 
@@ -128,7 +140,7 @@ protected:
 	void do_run() override;
 
 private:
-	process own_;
+	std::unique_ptr<process> own_;
 	process* p_;
 
 	void do_interrupt() override;
@@ -411,6 +423,7 @@ private:
 	generators gen_;
 	std::string genstring_;
 	fs::path prefix_;
+	std::vector<std::pair<std::string, std::string>> def_;
 	fs::path output_;
 	arch arch_;
 	std::string cmd_;
@@ -449,6 +462,8 @@ protected:
 	void do_run() override;
 
 private:
+	fs::path cwd_;
+	std::vector<std::string> def_;
 	std::string target_;
 	flags_t flags_;
 	arch arch_;
@@ -503,8 +518,6 @@ private:
 	void do_clean();
 	void do_build();
 	void do_run(const std::vector<std::string>& targets);
-
-	void error_filter(process::filter& f) const;
 };
 
 MOB_ENUM_OPERATORS(msbuild::flags_t);