diff --git a/klib/src/platform/osx/objc.def b/klib/src/platform/osx/objc.def
index 9631fe3be31..7ec71242549 100644
--- a/klib/src/platform/osx/objc.def
+++ b/klib/src/platform/osx/objc.def
@@ -7,6 +7,6 @@ headers = objc/List.h objc/NSObjCRuntime.h objc/NSObject.h objc/Object.h objc/Pr
 
 compilerOpts = -D_XOPEN_SOURCE
 linkerOpts = -lobjc
-
+depends = posix
 ---
 // objc-auto.h is excluded so far due to interop issues.
diff --git a/klib/src/platform/osx/osx.def b/klib/src/platform/osx/osx.def
index 8dfd8116e40..3734097073c 100644
--- a/klib/src/platform/osx/osx.def
+++ b/klib/src/platform/osx/osx.def
@@ -28,7 +28,7 @@ headers = AppleTextureEncoder.h AssertMacros.h Availability.h AvailabilityIntern
 
 compilerOpts = -D_XOPEN_SOURCE
 linkerOpts = -ldl -lz
-
+depends = posix
 ---
 
 // menu.h is excluded so far due to interop issues.
\ No newline at end of file
diff --git a/klib/src/platform/osx/zlib.def b/klib/src/platform/osx/zlib.def
index 46ed691d1a3..f30d62ea21b 100644
--- a/klib/src/platform/osx/zlib.def
+++ b/klib/src/platform/osx/zlib.def
@@ -1,3 +1,4 @@
 package = platform.zlib
 headers = zconf.h zlib.h
 linkerOpts = -lz
+depends = posix
\ No newline at end of file