diff --git a/.efrocachemap b/.efrocachemap
index 33047f4b..c3ec53ee 100644
--- a/.efrocachemap
+++ b/.efrocachemap
@@ -4080,18 +4080,18 @@
   "build/prefab/full/linux_x86_64_gui/release/ballisticakit": "https://files.ballistica.net/cache/ba1/58/55/8451262689d989ea20afb41de14c",
   "build/prefab/full/linux_x86_64_server/debug/dist/ballisticakit_headless": "https://files.ballistica.net/cache/ba1/4f/52/dce0af89103a5a03d1bb5782e7d0",
   "build/prefab/full/linux_x86_64_server/release/dist/ballisticakit_headless": "https://files.ballistica.net/cache/ba1/78/64/c34c3f8fb8bce1e08da4438b3350",
-  "build/prefab/full/mac_arm64_gui/debug/ballisticakit": "https://files.ballistica.net/cache/ba1/54/71/675c8ca94c655d9c1518e95fcf29",
+  "build/prefab/full/mac_arm64_gui/debug/ballisticakit": "https://files.ballistica.net/cache/ba1/53/e8/bdb466635413cef003cc7beb4179",
   "build/prefab/full/mac_arm64_gui/release/ballisticakit": "https://files.ballistica.net/cache/ba1/14/fb/35f54fb4b97377263f6305bd45c1",
-  "build/prefab/full/mac_arm64_server/debug/dist/ballisticakit_headless": "https://files.ballistica.net/cache/ba1/11/bd/9140d3716853388db6b964b48b10",
+  "build/prefab/full/mac_arm64_server/debug/dist/ballisticakit_headless": "https://files.ballistica.net/cache/ba1/94/ea/a22528edfc013e57f7c0d51af7c4",
   "build/prefab/full/mac_arm64_server/release/dist/ballisticakit_headless": "https://files.ballistica.net/cache/ba1/7b/7b/b41669c7b97755276ab1cbdcb92f",
-  "build/prefab/full/mac_x86_64_gui/debug/ballisticakit": "https://files.ballistica.net/cache/ba1/02/6c/a150463c7081403d91f1fed02172",
+  "build/prefab/full/mac_x86_64_gui/debug/ballisticakit": "https://files.ballistica.net/cache/ba1/b4/9d/468212340606bda65f6c1a827b79",
   "build/prefab/full/mac_x86_64_gui/release/ballisticakit": "https://files.ballistica.net/cache/ba1/f2/7b/7efa84c6410a671cf97586614669",
-  "build/prefab/full/mac_x86_64_server/debug/dist/ballisticakit_headless": "https://files.ballistica.net/cache/ba1/a9/16/099f8d7333f08ac27d6c6c9bbf34",
+  "build/prefab/full/mac_x86_64_server/debug/dist/ballisticakit_headless": "https://files.ballistica.net/cache/ba1/e7/a1/a976c972c118ab91821d4b012fd5",
   "build/prefab/full/mac_x86_64_server/release/dist/ballisticakit_headless": "https://files.ballistica.net/cache/ba1/f6/6e/657e14ff3c06d29ad2541647b191",
-  "build/prefab/full/windows_x86_gui/debug/BallisticaKit.exe": "https://files.ballistica.net/cache/ba1/41/4a/c79a3b9c4088a843c89450526ed2",
-  "build/prefab/full/windows_x86_gui/release/BallisticaKit.exe": "https://files.ballistica.net/cache/ba1/ae/f2/66c4eacac9556e27152ce7887848",
-  "build/prefab/full/windows_x86_server/debug/dist/BallisticaKitHeadless.exe": "https://files.ballistica.net/cache/ba1/99/d0/e59aeff459d771250752c1c9e855",
-  "build/prefab/full/windows_x86_server/release/dist/BallisticaKitHeadless.exe": "https://files.ballistica.net/cache/ba1/37/ef/77009c474fbf78a623e536080f44",
+  "build/prefab/full/windows_x86_gui/debug/BallisticaKit.exe": "https://files.ballistica.net/cache/ba1/c2/05/d36ce195d6c282938d8aaa9415ab",
+  "build/prefab/full/windows_x86_gui/release/BallisticaKit.exe": "https://files.ballistica.net/cache/ba1/a2/72/2f8c89fcf511c81086f7ad2c8dea",
+  "build/prefab/full/windows_x86_server/debug/dist/BallisticaKitHeadless.exe": "https://files.ballistica.net/cache/ba1/ae/f3/4c78c53110022104bed336890864",
+  "build/prefab/full/windows_x86_server/release/dist/BallisticaKitHeadless.exe": "https://files.ballistica.net/cache/ba1/a7/8e/ef9efaf2ea56e4044b9bdda25867",
   "build/prefab/lib/linux_arm64_gui/debug/libballistica_plus.a": "https://files.ballistica.net/cache/ba1/fd/89/44e2ebc1017c94053d3df1f6cb8a",
   "build/prefab/lib/linux_arm64_gui/release/libballistica_plus.a": "https://files.ballistica.net/cache/ba1/38/d7/7110069365b22bee424f36e1bf5a",
   "build/prefab/lib/linux_arm64_server/debug/libballistica_plus.a": "https://files.ballistica.net/cache/ba1/6c/89/1c44605fe89b5faa9b1061455838",
@@ -4108,14 +4108,14 @@
   "build/prefab/lib/mac_x86_64_gui/release/libballistica_plus.a": "https://files.ballistica.net/cache/ba1/58/12/59092d28e6e8e1923dfff8d7e5de",
   "build/prefab/lib/mac_x86_64_server/debug/libballistica_plus.a": "https://files.ballistica.net/cache/ba1/2e/a0/a2a78934c1193505f3d62989a152",
   "build/prefab/lib/mac_x86_64_server/release/libballistica_plus.a": "https://files.ballistica.net/cache/ba1/67/56/ea651dddf9502c0513f29fb1a8c0",
-  "build/prefab/lib/windows/Debug_Win32/BallisticaKitGenericPlus.lib": "https://files.ballistica.net/cache/ba1/95/7e/139ec220b17cf9827c6dd053c76f",
-  "build/prefab/lib/windows/Debug_Win32/BallisticaKitGenericPlus.pdb": "https://files.ballistica.net/cache/ba1/aa/f0/f56766303adbece7d41c1030d5bb",
-  "build/prefab/lib/windows/Debug_Win32/BallisticaKitHeadlessPlus.lib": "https://files.ballistica.net/cache/ba1/7f/ba/fb8b95c87fa0d17eecdf269b1619",
-  "build/prefab/lib/windows/Debug_Win32/BallisticaKitHeadlessPlus.pdb": "https://files.ballistica.net/cache/ba1/57/db/224bab05c00ed4622ddf13a9ced8",
-  "build/prefab/lib/windows/Release_Win32/BallisticaKitGenericPlus.lib": "https://files.ballistica.net/cache/ba1/d7/aa/30442818769575691a26829cbec0",
-  "build/prefab/lib/windows/Release_Win32/BallisticaKitGenericPlus.pdb": "https://files.ballistica.net/cache/ba1/03/b3/6fbc53e7ff5e851a6bf6bd30195e",
-  "build/prefab/lib/windows/Release_Win32/BallisticaKitHeadlessPlus.lib": "https://files.ballistica.net/cache/ba1/d2/63/25c130fc9f80fa2ac66f6441bfcb",
-  "build/prefab/lib/windows/Release_Win32/BallisticaKitHeadlessPlus.pdb": "https://files.ballistica.net/cache/ba1/ec/f9/9d7a013c7558c6d57af467099329",
+  "build/prefab/lib/windows/Debug_Win32/BallisticaKitGenericPlus.lib": "https://files.ballistica.net/cache/ba1/3c/af/ba65b04dd9af4ad7de94418e5991",
+  "build/prefab/lib/windows/Debug_Win32/BallisticaKitGenericPlus.pdb": "https://files.ballistica.net/cache/ba1/d2/23/79d25e95ffd28b47fd850705418c",
+  "build/prefab/lib/windows/Debug_Win32/BallisticaKitHeadlessPlus.lib": "https://files.ballistica.net/cache/ba1/7b/de/a3818e9a608ae25be87f104d8e4c",
+  "build/prefab/lib/windows/Debug_Win32/BallisticaKitHeadlessPlus.pdb": "https://files.ballistica.net/cache/ba1/70/a2/5d902029410e651759e25398b5fe",
+  "build/prefab/lib/windows/Release_Win32/BallisticaKitGenericPlus.lib": "https://files.ballistica.net/cache/ba1/90/0f/a993bab48929ce266d03bc6fb3e8",
+  "build/prefab/lib/windows/Release_Win32/BallisticaKitGenericPlus.pdb": "https://files.ballistica.net/cache/ba1/26/c9/014a9924cfd7f1cf175f997f0d5a",
+  "build/prefab/lib/windows/Release_Win32/BallisticaKitHeadlessPlus.lib": "https://files.ballistica.net/cache/ba1/f7/35/20b99160afd9ea42db1b63e332ef",
+  "build/prefab/lib/windows/Release_Win32/BallisticaKitHeadlessPlus.pdb": "https://files.ballistica.net/cache/ba1/b1/06/e81b58630f80260bfa091ae3a596",
   "src/assets/ba_data/python/babase/_mgen/__init__.py": "https://files.ballistica.net/cache/ba1/52/c6/c11130af7b10d6c0321add5518fa",
   "src/assets/ba_data/python/babase/_mgen/enums.py": "https://files.ballistica.net/cache/ba1/38/c3/1dedd5e74f2508efc5974c8815a1",
   "src/ballistica/base/mgen/pyembed/binding_base.inc": "https://files.ballistica.net/cache/ba1/ea/6a/6a4721b144e5e297b542d2a0eea2",
diff --git a/tools/batools/build.py b/tools/batools/build.py
index dc1e42a8..df5585ae 100644
--- a/tools/batools/build.py
+++ b/tools/batools/build.py
@@ -60,6 +60,7 @@ PY_REQUIREMENTS = [
     PyRequirement(pipname='certifi', minversion=[2022, 12, 7]),
     PyRequirement(pipname='types-certifi', minversion=[2021, 10, 8, 3]),
     PyRequirement(pipname='pbxproj', minversion=[3, 5, 0]),
+    PyRequirement(pipname='filelock', minversion=[3, 12, 0]),
 ]
 
 # Parts of full-tests suite we only run on particular days.
@@ -885,31 +886,6 @@ def get_pip_reqs() -> list[str]:
     return out
 
 
-# def update_makebob() -> None:
-#     """Build fresh make_bob binaries for all relevant platforms."""
-#     print('Building mac_x86_64...', flush=True)
-#     env = dict(os.environ)
-#     env['CMAKE_BUILD_TYPE'] = 'Release'
-#     subprocess.run(['make', 'cmake-build'], check=True, env=env)
-#     subprocess.run(
-#         [
-#             'cp', '-v', 'build/cmake/release/make_bob',
-#             'tools/make_bob/mac_x86_64/'
-#         ],
-#         check=True,
-#     )
-#     print('Building linux_x86_64...', flush=True)
-#     subprocess.run(['make', 'linux-vm-build'], check=True, env=env)
-#     subprocess.run(
-#         [
-#             'cp', '-v', 'build/linux-release/make_bob',
-#             'tools/make_bob/linux_x86_64/'
-#         ],
-#         check=True,
-#     )
-#     print('All builds complete!', flush=True)
-
-
 def _get_server_config_raw_contents(projroot: str) -> str:
     import textwrap