diff --git a/dep/fatfs/build.py b/dep/fatfs/build.py
index 31a74596..5016e1f6 100644
--- a/dep/fatfs/build.py
+++ b/dep/fatfs/build.py
@@ -15,4 +15,5 @@ clibrary(
         "ffconf.h": "./source/ffconf.h",
         "diskio.h": "./source/diskio.h",
     },
+    cflags=["-Wno-pointer-sign"],
 )
diff --git a/dep/hfsutils/build.py b/dep/hfsutils/build.py
index b040ffe1..5df683f7 100644
--- a/dep/hfsutils/build.py
+++ b/dep/hfsutils/build.py
@@ -22,4 +22,5 @@ clibrary(
         "libhfs.h": "./libhfs/libhfs.h",
         "os.h": "./libhfs/os.h",
     },
+    cflags=["-Wno-pointer-sign"],
 )
diff --git a/dep/libusbp/build.py b/dep/libusbp/build.py
index 491f7b0e..4743e695 100644
--- a/dep/libusbp/build.py
+++ b/dep/libusbp/build.py
@@ -60,7 +60,11 @@ else:
 clibrary(
     name="libusbp",
     srcs=srcs,
-    cflags=["-Idep/libusbp/include", "-Idep/libusbp/src"],
+    cflags=[
+        "-Idep/libusbp/include",
+        "-Idep/libusbp/src",
+        "-Wno-deprecated-declarations",
+    ],
     caller_ldflags=ldflags,
     deps=deps,
     hdrs={