--- gcc/config/m68k/x-hp320g	2018/04/24 18:10:24	1.1.1.1
+++ gcc/config/m68k/x-hp320g	2018/04/24 18:27:55	1.1.1.2
@@ -12,3 +12,6 @@ X_CFLAGS= -I../hp-include
 
 # Version 5 of HPUX had a compiler bug that made it crash with -g.
 # You must set CFLAGS to empty on version 5.
+
+# So putenv and other functions get seen by fixproto.
+FIXPROTO_DEFINES = -D_HPUX_SOURCE