diff --git a/Makefile b/Makefile
index b20a852..82b5324 100644
--- a/Makefile
+++ b/Makefile
@@ -1,57 +1,13 @@
-basic_flags := -std=c99 -pipe -Wall -Wpedantic -Wextra -Wconversion -Werror=implicit-function-declaration -Werror=implicit-int -Werror=incompatible-pointer-types -Werror=int-conversion -D_XOPEN_SOURCE_EXTENDED=1
-debug_flags := -DDEBUG -ggdb
-sanitize_flags := -fsanitize=address -fsanitize=undefined
-# note: -fsanitize=leak not available on at least Mac 10.12
-release_flags := -DNDEBUG -O2 -g0
-# safety flags if you want a build that guards. pie doesn't work with clang
-# with the other combinations of options in release we're using on linux.
-safety_flags := -D_FORTIFY_SOURCE=2 -fstack-protector-strong -fpie -Wl,-pie
-cli_library_flags :=
-ifeq ($(shell uname -s), Darwin)
-# no -Og on Mac clang, use O1 instead
-debug_flags := $(debug_flags) -O1
-tui_library_flags := -lncurses
-# clang on Mac 10.12 is slower with -flto, and -s is deprecated
-else
-debug_flags := $(debug_flags) -Og -feliminate-unused-debug-symbols
-# GCC on Linux is way faster and moderately smaller with -flto, and smaller with -s
-release_flags := $(release_flags) -flto -s
-tui_library_flags := -lncursesw
-endif
-common_source_files := field.c mark.c bank.c sim.c
-tui_source_files := $(common_source_files) tui_main.c
-cli_source_files := $(common_source_files) cli_main.c
-
 all: debug
 
-build:
-	@mkdir $@
-
-build/debug build/release: | build
-	@mkdir $@
-
-.PHONY: debug_cli
-debug_cli: | build/debug
-	@$(CC) $(basic_flags) $(debug_flags) $(sanitize_flags) $(cli_source_files) -o build/debug/orca $(cli_library_flags)
-
-.PHONY: debug_tui
-debug_tui: | build/debug
-	@$(CC) $(basic_flags) $(debug_flags) $(sanitize_flags) $(tui_source_files) -o build/debug/orca_tui $(tui_library_flags)
-
 .PHONY: debug
-debug: debug_cli
-
-.PHONY: release_cli
-release_cli: | build/release
-	@$(CC) $(basic_flags) $(release_flags) $(cli_source_files) -o build/release/orca $(cli_library_flags)
-
-.PHONY: release_tui
-release_tui: | build/release
-	@$(CC) $(basic_flags) $(release_flags) $(tui_source_files) -o build/release/orca_tui $(tui_library_flags)
+debug:
+	@./tool build debug
 
 .PHONY: release
-release: release_cli
+release:
+	@./tool build release
 
 .PHONY: clean
 clean:
-	rm -rf build
+	@./tool clean
diff --git a/tool b/tool
index fa53147..d71d5ce 100755
--- a/tool
+++ b/tool
@@ -1,16 +1,6 @@
 #!/usr/bin/env bash
 set -eu -o pipefail
 
-os=
-case $(uname -s | awk '{print tolower($0)}') in
-  linux*) os=linux;;
-  darwin*) os=mac;;
-  cygwin*) os=cygwin;;
-  *bsd*) os=bsd;;
-  *) os=unknown;;
-esac
-
-
 print_usage() {
 cat <<EOF
 Usage: tool [options] command [args]
@@ -35,6 +25,15 @@ Options:
 EOF
 }
 
+os=
+case $(uname -s | awk '{print tolower($0)}') in
+  linux*) os=linux;;
+  darwin*) os=mac;;
+  cygwin*) os=cygwin;;
+  *bsd*) os=bsd;;
+  *) os=unknown;;
+esac
+
 compiler_exe="${CC:-cc}"
 
 verbose=0