Mine

 /usr/bin/gcc-4.0 -DPACKAGE_NAME=\"libIDL\" -DPACKAGE_TARNAME=\"libIDL\" -DPACKAGE_VERSION=\"0.8.9\" "-DPACKAGE_STRING=\"libIDL 0.8.9\"" "-DPACKAGE_BUGREPORT=\"http://bugzilla.gnome.org/enter_bug.cgi?product=libIDL\"" -DLIBIDL_VERSION=\"0.8.9\" -DHAVE_CPP_PIPE_STDIN=1 -DCPP_NOSTDINC=\"-I-\" -DCPP_PROGRAM=\"/usr/bin/cpp-4.0\" -DYYTEXT_POINTER=1 -DSTDC_HEADERS=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_STDINT_H=1 -DHAVE_UNISTD_H=1 -DHAVE_DLFCN_H=1 -DSTDC_HEADERS=1 -DHAVE_STDDEF_H=1 -DHAVE_UNISTD_H=1 -DHAVE_WCHAR_H=1 -DHAVE_POPEN=1 -DHAVE_SYMLINK=1 -DHAVE_ACCESS=1 -DSIZEOF_LONG_LONG=8 -I. -I. -DYYDEBUG=1 -DYYERROR_VERBOSE=1 -I/opt/local/include/glib-2.0 -I/opt/local/lib/glib-2.0/include -I/opt/local/include -I./include -DG_LOG_DOMAIN=\"libIDL\" -Wall -Wunused -Wmissing-prototypes -Wmissing-declarations -I/opt/local/include -O2 -no-cpp-precomp -MT util.lo -MD -MP -MF .deps/util.Tpo -c util.c -o util.o >/dev/null 2>&1
/bin/sh ./libtool --mode=link /usr/bin/gcc-4.0  -O2 -no-cpp-precomp  -L/opt/local/lib -o libIDL-2.la -rpath /opt/local/lib -version-info 0:0:0 -L/opt/local/lib -lglib-2.0 -lintl -liconv   -no-undefined parser.lo lexer.lo ns.lo util.lo  
/usr/bin/gcc-4.0 -dynamiclib  -o .libs/libIDL-2.0.0.0.dylib  .libs/parser.o .libs/lexer.o .libs/ns.o .libs/util.o  -L/opt/local/lib /opt/local/lib/libglib-2.0.dylib /opt/local/lib/libintl.dylib /opt/local/lib/libiconv.dylib  -install_name  /opt/local/lib/libIDL-2.0.dylib -compatibility_version 1 -current_version 1.0
Undefined symbols:
  "___IDL_lex", referenced from:
      ___IDL_parse in parser.o
  "___IDL_lex_init", referenced from:
      _IDL_parse_filename_with_input in util.o
      _IDL_parse_filename in util.o
  "___IDL_cur_token_line", referenced from:
      ___IDL_cur_token_line$non_lazy_ptr in parser.o
  "___IDL_in", referenced from:
      ___IDL_in$non_lazy_ptr in util.o
  "___IDL_lex_cleanup", referenced from:
      _IDL_parse_filename_with_input in util.o
      _IDL_parse_filename_with_input in util.o
      _IDL_parse_filename in util.o
  "___IDL_prev_token_line", referenced from:
      ___IDL_prev_token_line$non_lazy_ptr in parser.o
ld: symbol(s) not found
collect2: ld returned 1 exit status
make[2]: *** [libIDL-2.la] Error 1
make[1]: *** [all-recursive] Error 1
make: *** [all] Error 2

Error: Status 1 encountered during processing.