diff --git a/include/libbb.h b/include/libbb.h
index 6358e654a..dd82e9754 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -33,6 +33,9 @@
 #include <sys/stat.h>
 #include <sys/time.h>
 #include <sys/types.h>
+#ifndef major
+# include <sys/sysmacros.h>
+#endif
 #include <sys/wait.h>
 #include <termios.h>
 #include <time.h>
diff --git a/include/platform.h b/include/platform.h
index 9d6e21626..f0b8ec10a 100644
--- a/include/platform.h
+++ b/include/platform.h
@@ -362,7 +362,7 @@ typedef unsigned smalluint;
 
 #endif
 
-#if defined(__GLIBC__)
+#if (defined(_POSIX_VERSION) && _POSIX_VERSION >= 200809L) || defined(__GLIBC__)
 # define fdprintf dprintf
 #endif