Index: src/platform.h
==================================================================
--- src/platform.h
+++ src/platform.h
@@ -149,11 +149,11 @@
 # define OF_MSDOS
 #elif defined(__riscos__)
 # define OF_ACORN_RISC_OS
 #elif defined(__MINT__)
 # define OF_MINT
-#elif defined(__gnu__)
+#elif defined(__gnu_hurd__)
 # define OF_HURD
 #endif
 
 #if defined(__ELF__)
 # define OF_ELF