build gtk on os x fails

[Roman Kovalev <romanlisper gmail com>]

> jhbuild build meta-gtk-osx-core

...

*** Checking out freetype *** [4/14]

*** Building freetype *** [4/14]

make  

cc  -I/Users/user/gtk/inst/include -I./objs -I./builds/ansi -I./include -arch x86_64 -mmacosx-version-min=10.7 -DFT2_BUILD_LIBRARY -DFT_CONFIG_MODULES_H="<ftmodule.h>"  -o objs/ftsystem.o src/base/ftsystem.c

Undefined symbols for architecture x86_64:

  "_main", referenced from:

      start in crt1.10.6.o

ld: symbol(s) not found for architecture x86_64

clang: error: linker command failed with exit code 1 (use -v to see invocation)

make: *** [objs/ftsystem.o] Error 1

*** Error during phase build of freetype: ########## Error running make   *** [4/14]

  [1] Rerun phase build

  [2] Ignore error and continue to install

  [3] Give up on module

  [4] Start shell

  [5] Reload configuration

  [6] Go to phase "wipe directory and start over"

  [7] Go to phase "configure"

  [8] Go to phase "clean"

  [9] Go to phase "distclean"

choice: