Header file "include/foreign/foreign.h" is not installed in 8.4.0.
Did we forget to add subdir "foreign" to Makefile?
Index: src/include/Makefile
===================================================================
--- src/include/Makefile (8.4.0)
+++ src/include/Makefile (fixed)
@@ -17,7 +17,7 @@# Subdirectories containing headers for server-side dev
-SUBDIRS = access bootstrap catalog commands executor lib libpq mb \
+SUBDIRS = access bootstrap catalog commands executor foreign lib libpq mb \ nodes optimizer parser postmaster regex
rewritestorage tcop \ snowball snowball/libstemmer tsearch tsearch/dicts utils \ port port/win32 port/win32_msvc
port/win32_msvc/sys\
Regards,
---
ITAGAKI Takahiro
NTT Open Source Software Center