error: tag name "CXX" already exists我在装配eva的时候老是报如下的差错，请大家帮帮我，谢谢！！
/bin/sh ./config.status --recheck
running /bin/sh ./configure--prefix=/usr/local--no-create --no-recursion
checking build system type... i386-unknown-freebsd6.0
checking host system type... i386-unknown-freebsd6.0
checking target system type... i386-unknown-freebsd6.0
checking for a BSD-compatible install... /usr/bin/install -c
checking for -p flag to install... yes
checking whether build environment is sane... yes
checking for gawk... no
checking for mawk... no
checking for nawk... nawk
checking whether make sets ${MAKE}... yes
checking for style of include used by make... GNU
checking for gcc... gcc
checking for C compiler default output... 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 dependency style of gcc... gcc3
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 dependency style of g++... gcc3
checking whether g++ supports -Wundef... yes
checking whether g++ supports -Wno-long-long... yes
checking whether g++ supports -Wnon-virtual-dtor... yes
checking whether g++ supports -fno-exceptions... yes
checking whether g++ supports -fno-check-new... yes
checking whether g++ supports -fno-common... yes
checking whether g++ supports -fexceptions... yes
checking how to run the C++ preprocessor... g++ -E
checking whether g++ supports -O0... yes
not using lib directory suffix
checking for a sed that does not truncate output... /usr/bin/sed
checking for egrep... grep -E
checking for ld used by gcc... /usr/bin/ld
checking if the linker (/usr/bin/ld) is GNU ld... yes
checking for /usr/bin/ld option to reload object files... -r
checking for BSD-compatible nm... /usr/bin/nm -B
checking whether ln -s works... yes
checking how to recognise dependent libraries... pass_all
checking for ANSI C header files... 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 dlfcn.h usability... yes
checking dlfcn.h presence... yes
checking for dlfcn.h... yes
checking for g77... no
checking for f77... f77
checking whether we are using the GNU Fortran 77 compiler... yes
checking whether f77 accepts -g... yes
checking the maximum length of command line arguments... 65536
checking command to parse /usr/bin/nm -B output from gcc object... ok
checking for objdir... .libs
checking for ar... ar
checking for ranlib... ranlib
checking for strip... strip
checking if gcc static flagworks... yes
checking if gcc supports -fno-rtti -fno-exceptions... no
checking for gcc option to produce PIC... -fPIC
checking if gcc PIC flag -fPIC works... yes
checking if gcc supports -c -o file.o... yes
checking whether the gcc linker (/usr/bin/ld) supports shared libraries... yes
checking whether -lc should be explicitly linked in... yes
checking dynamic linker characteristics... freebsd6.0 ld.so
checking how to hardcode library paths into programs... immediate
checking whether stripping libraries is possible... yes
checking for shl_load... no
checking for shl_load in -ldld... no
checking for dlopen... yes
checking whether a program can dlopen itself... yes
checking whether a statically linked program can dlopen itself... yes
checking if libtool supports shared libraries... yes
checking whether to build shared libraries... yes
checking whether to build static libraries... no
configure: creating libtool
appending configuration tag "CXX" to libtool
checking for ld used by g++... /usr/bin/ld
checking if the linker (/usr/bin/ld) is GNU ld... yes
checking whether the g++ linker (/usr/bin/ld) supports shared libraries... yes
checking for g++ option to produce PIC... -fPIC
checking if g++ PIC flag -fPIC works... yes
checking if g++ supports -c -o file.o... yes
checking whether the g++ linker (/usr/bin/ld) supports shared libraries... yes
checking dynamic linker characteristics... freebsd6.0 ld.so
checking how to hardcode library paths into programs... immediate
checking whether stripping libraries is possible... yes
checking for shl_load... (cached) no
checking for shl_load in -ldld... (cached) no
checking for dlopen... (cached) yes
checking whether a program can dlopen itself... (cached) yes
checking whether a statically linked program can dlopen itself... (cached) yes
appending configuration tag "F77" to libtool
checking if libtool supports shared libraries... yes
checking whether to build shared libraries... yes
checking whether to build static libraries... no
checking for f77 option to produce PIC... -fPIC
checking if f77 PIC flag -fPIC works... yes
checking if f77 supports -c -o file.o... yes
checking whether the f77 linker (/usr/bin/ld) supports shared libraries... yes
checking dynamic linker characteristics... freebsd6.0 ld.so
checking how to hardcode library paths into programs... immediate
checking whether stripping libraries is possible... yes
configure: error: tag name "CXX" already exists
*** Error code 1
Stop in /usr/ports/net/eva.请各位大侠帮援助了，诚实是不知晓该怎么办了，谢谢！
为什么提醒configure: error: tag name "CXX" already exists
但,
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