Merged revisions 77212-77215 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk

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  r77212 | benjamin.peterson | 2010-01-01 09:16:29 -0600 (Fri, 01 Jan 2010) | 1 line

  use pkg-config to find the libffi headers when --with-system-ffi is used #6943
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  r77213 | benjamin.peterson | 2010-01-01 09:18:38 -0600 (Fri, 01 Jan 2010) | 1 line

  add note
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  r77214 | benjamin.peterson | 2010-01-01 09:20:06 -0600 (Fri, 01 Jan 2010) | 1 line

  fix indentation
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  r77215 | benjamin.peterson | 2010-01-01 09:21:13 -0600 (Fri, 01 Jan 2010) | 1 line

  allow --with-dbmliborder to specify that no dbm modules will be built #6491
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diff --git a/configure.in b/configure.in
index 0abb2ba..6635208 100644
--- a/configure.in
+++ b/configure.in
@@ -1872,6 +1872,14 @@
 AC_ARG_WITH(system_ffi,
             AC_HELP_STRING(--with-system-ffi, build _ctypes module using an installed ffi library))
 
+if test "$with_system_ffi" = "yes"; then
+    AC_PATH_TOOL([PKG_CONFIG], [pkg-config])
+    LIBFFI_INCLUDEDIR="`"$PKG_CONFIG" libffi --cflags-only-I 2>/dev/null | sed -e 's/^-I//;s/ *$//'`"
+else
+    LIBFFI_INCLUDEDIR=""
+fi
+AC_SUBST(LIBFFI_INCLUDEDIR)
+
 AC_MSG_RESULT($with_system_ffi)
 
 # Check for --with-dbmliborder