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-rw-r--r--src/m/pmax.h7
1 files changed, 6 insertions, 1 deletions
diff --git a/src/m/pmax.h b/src/m/pmax.h
index b3d8dc0df66..fcead9e6a78 100644
--- a/src/m/pmax.h
+++ b/src/m/pmax.h
@@ -78,7 +78,12 @@ NOTE-END */
Using the MIT X11 distribution instead of the one provided by Dec will
also solve the problem, but I doubt you can convince everyone to do this. */
-#define C_SWITCH_X_MACHINE -DNeedFunctionPrototypes=0
+/* Addendum: the MIT X11 distribution neglects to define certain symbols
+ when NeedFunctionPrototypes is 0, but still tries to use them when
+ NeedVarargsProrotypes is 1 (which is its default value). So if we're
+ going to disable non-variadic prototypes, we also need to disable
+ variadic prototypes. --kwzh@gnu.ai.mit.edu */
+#define C_SWITCH_X_MACHINE -DNeedFunctionPrototypes=0 -DNeedVarargsPrototypes=0
/* Enable a fix in process.c. */
#define SET_CHILD_PTY_PGRP