我尝试安装mscgen但是我有这个错误：
xxxxx-mac:bin xxxxx$ sudo port install mscgen
---> Computing dependencies for mscgen
---> Dependencies to be installed: gd2 xpm xorg-libXext xorg-libX11 xorg-libxcb python27 python27 xorg-libpthread-stubs xorg-xcb-proto libxml2 xorg-util-macros xorg-xcmiscproto xorg-xextproto xorg-xf86bigfontproto xorg-xtrans xorg-libXt xorg-libsm xorg-libice
---> Building python27
Error: Target org.macports.build returned: shell command failed (see log for details)
Error: Failed to install python27
Log for python27 is at: /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_python27/python27/main.log
Error: The following dependencies were not installed: gd2 xpm xorg-libXext xorg-libX11 xorg-libxcb python27 python27 xorg-libpthread-stubs xorg-xcb-proto libxml2 xorg-util-macros xorg-xcmiscproto xorg-xextproto xorg-xf86bigfontproto xorg-xtrans xorg-libXt xorg-libsm xorg-libice
Error: Status 1 encountered during processing.
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