[plt-dev] foreign fails to configure

I'm starting from a clean build directory and get the error:

configure: error: source directory already configured; run "make
distclean" there first
configure: error: ../../../../foreign/gcc/libffi/configure failed for
foreign/gcc/libffi

Full transcript below.

Robby

[chienshi] ~/svn/exp/plt/src% mkdir build
[chienshi] ~/svn/exp/plt/src% cd build
[chienshi] exp/plt/src/build% ../configure
checking for gcc... gcc
checking for C compiler default output file name... a.out
checking whether the C compiler works... yes
checking whether we are cross compiling... no
checking for suffix of executables...
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ISO C89... none needed
checking how to run the C preprocessor... gcc -E
checking for g++... g++
checking whether we are using the GNU C++ compiler... yes
checking whether g++ accepts -g... yes
checking how to run the C++ preprocessor... g++ -E
checking for ranlib... ranlib
checking for cos in -lm... yes
checking for dlopen in -ldl... yes
checking for inline keyword... yes
checking for noinline attribute... yes
checking for GNU preprocessor... yes
checking for nl_langinfo (CODESET)... yes
checking for getaddrinfo... no
checking for grep that handles long lines and -e... /usr/bin/grep
checking for egrep... /usr/bin/grep -E
checking for ANSI C header files... rm: conftest.dSYM: is a directory
rm: conftest.dSYM: is a directory
yes
checking for sys/types.h... yes
checking for sys/stat.h... yes
checking for stdlib.h... yes
checking for string.h... yes
checking for memory.h... yes
checking for strings.h... yes
checking for inttypes.h... yes
checking for stdint.h... yes
checking for unistd.h... yes
checking iconv.h usability... yes
checking iconv.h presence... yes
checking for iconv.h... yes
checking iconv is usable... yes -liconv
checking for mbsrtowcs... yes
checking for char... yes
checking size of char... 1
checking for short... yes
checking size of short... 2
checking for int... yes
checking size of int... 4
checking for long... yes
checking size of long... 4
checking for long long... yes
checking size of long long... 8
checking for stack direction... down
checking whether byte ordering is bigendian... no
checking whether C++ compiler works... yes
checking whether new and new[] are different... yes
checking png.h usability... no
checking png.h presence... no
checking for png.h... no
no libpng headers installed; building from PLT copy
checking jpeglib.h usability... no
checking jpeglib.h presence... no
checking for jpeglib.h... no
no libjpeg headers installed; building from PLT copy
configure: creating ./config.status
config.status: creating Makefile
config.status: creating mzscheme/Makefile
config.status: creating mzscheme/src/Makefile
config.status: creating mzscheme/dynsrc/Makefile
config.status: creating mzscheme/gc/Makefile
config.status: creating mzscheme/sgc/Makefile
config.status: creating mzscheme/gc2/Makefile
config.status: creating foreign/Makefile
config.status: creating mred/Makefile
config.status: creating mred/wxs/Makefile
config.status: creating mred/gc2/Makefile
config.status: creating wxcommon/libpng/Makefile
config.status: creating wxcommon/zlib/Makefile
config.status: creating wxmac/src/Makefile
config.status: creating mzscheme/mzconfig.h
=== configuring in foreign/gcc/libffi
(/Users/robby/svn/exp/plt/src/build/foreign/gcc/libffi)
configure: running /bin/sh ../../../../foreign/gcc/libffi/configure
'--prefix=/Users/robby/svn/exp/plt'  '--disable-multilib'
--cache-file=/dev/null --srcdir=../../../../foreign/gcc/libffi
checking build system type... i386-apple-darwin9.6.0
checking host system type... i386-apple-darwin9.6.0
checking target system type... i386-apple-darwin9.6.0
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for gawk... no
checking for mawk... no
checking for nawk... no
checking for awk... awk
checking whether make sets $(MAKE)... yes
configure: error: source directory already configured; run "make
distclean" there first
configure: error: ../../../../foreign/gcc/libffi/configure failed for
foreign/gcc/libffi
Exit 1
[chienshi] exp/plt/src/build%