Index: src/platform.h
==================================================================
--- src/platform.h
+++ src/platform.h
@@ -139,10 +139,12 @@
 # define OF_AMIGAOS
 #elif defined(__sun__)
 # define OF_SOLARIS
 #elif defined(__QNX__)
 # define OF_QNX
+#elif defined(__hpux__)
+# define OF_HPUX
 #elif defined(_PSP)
 # define OF_PSP
 #elif defined(__DJGPP__)
 # define OF_DJGPP
 # define OF_MSDOS