diff --git a/Makefile b/Makefile
index 1bb0d254..433a597c 100644
--- a/Makefile
+++ b/Makefile
@@ -10,7 +10,9 @@ endif
 
 DEVENV=devenv$(shell pwd | sed 's/\//-/g')
 DEVENV_IMAGE=nostalgia-devenv
-RM_RF=python3 scripts/pybb rm
+PYBB=python3 scripts/pybb
+CMAKE_BUILD=${PYBB} cmake-build
+RM_RF=${PYBB} rm
 ifndef VCPKG_DIR_BASE
 	VCPKG_DIR_BASE=.vcpkg
 endif
@@ -33,17 +35,17 @@ endif
 
 .PHONY: build
 build:
-	$(foreach file, $(wildcard build/*), ${ENV_RUN} cmake --build $(file) --target;)
+	${ENV_RUN} ${CMAKE_BUILD} build
 .PHONY: pkg-gba
 pkg-gba:
-	$(foreach file, $(wildcard build/*), ${ENV_RUN} cmake --build $(file) --target install;)
+	${ENV_RUN} ${CMAKE_BUILD} build install
 	${ENV_RUN} ./scripts/pkg-gba sample_project
 .PHONY: install
 install:
-	$(foreach file, $(wildcard build/*), ${ENV_RUN} cmake --build $(file) --target install;)
+	${ENV_RUN} ${CMAKE_BUILD} build install
 .PHONY: clean
 clean:
-	$(foreach file, $(wildcard build/*), ${ENV_RUN} cmake --build $(file) --target clean;)
+	${ENV_RUN} ${CMAKE_BUILD} build clean
 .PHONY: purge
 purge:
 	${ENV_RUN} ${RM_RF} .current_build
diff --git a/scripts/pybb b/scripts/pybb
index f52b45d6..98c64aa5 100644
--- a/scripts/pybb
+++ b/scripts/pybb
@@ -3,20 +3,34 @@
 import os
 import shutil
 import stat
+import subprocess
 import sys
 
 def mkdir(path):
     if not os.path.exists(path) and os.path.isdir(path):
         os.mkdir(path)
 
+# this exists because Windows is utterly incapable of providing a proper rm -rf
 def rm(path):
     if (os.path.exists(path) or os.path.islink(path)) and not os.path.isdir(path):
         os.remove(path)
     elif os.path.isdir(path):
         shutil.rmtree(path)
 
-if sys.argv[1] == 'mkdir':
-    mkdir(sys.argv[2])
-elif sys.argv[1] == 'rm':
-    for i in range(2, len(sys.argv)):
-        rm(sys.argv[i])
+def cmake_build(base_path, target):
+    for d in os.listdir(base_path):
+        args = ['cmake', '--build', os.path.join(base_path, d), '--target']
+        if target is not None:
+            args.append(target)
+        err = subprocess.run(args).returncode
+        if err != 0:
+            sys.exit(err)
+
+if __name__ == '__main__':
+    if sys.argv[1] == 'mkdir':
+        mkdir(sys.argv[2])
+    elif sys.argv[1] == 'rm':
+        for i in range(2, len(sys.argv)):
+            rm(sys.argv[i])
+    elif sys.argv[1] == 'cmake-build':
+        cmake_build(sys.argv[2], sys.argv[3] if len(sys.argv) > 3 else None)