How do you set compiler flags manually? I'm not familiar with that. CFLAGS or some such? Tell me what options should be used and I'll lookup the keyword to set it in a port.
I think otool is the equivalent of dd. Here's the output of my macports install of bibledit again.
otool -L /opt/local/bin/bibledit-gtk
/opt/local/bin/bibledit-gtk:
/opt/local/lib/libxml2.2.dylib (compatibility version 12.0.0, current version 12.0.0)
/opt/local/lib/libz.1.dylib (compatibility version 1.0.0, current version 1.2.7)
/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 159.1.0)
/opt/local/lib/libiconv.2.dylib (compatibility version 8.0.0, current version 8.1.0)
/opt/local/lib/libgobject-2.0.0.dylib (compatibility version 3601.0.0, current version 3601.0.0)
/opt/local/lib/libglib-2.0.0.dylib (compatibility version 3601.0.0, current version 3601.0.0)
/opt/local/lib/libintl.8.dylib (compatibility version 10.0.0, current version 10.2.0)
/opt/local/lib/libgthread-2.0.0.dylib (compatibility version 3601.0.0, current version 3601.0.0)
/opt/local/lib/libgtk-x11-2.0.0.dylib (compatibility version 2401.0.0, current version 2401.17.0)
/opt/local/lib/libgdk-x11-2.0.0.dylib (compatibility version 2401.0.0, current version 2401.17.0)
/opt/local/lib/libatk-1.0.0.dylib (compatibility version 20810.0.0, current version 20810.1.0)
/opt/local/lib/libpangocairo-1.0.0.dylib (compatibility version 3201.0.0, current version 3201.5.0)
/opt/local/lib/libpangoft2-1.0.0.dylib (compatibility version 3201.0.0, current version 3201.5.0)
/opt/local/lib/libpango-1.0.0.dylib (compatibility version 3201.0.0, current version 3201.5.0)
/opt/local/lib/libfreetype.6.dylib (compatibility version 16.0.0, current version 16.0.0)
/opt/local/lib/libgio-2.0.0.dylib (compatibility version 3601.0.0, current version 3601.0.0)
/opt/local/lib/libfontconfig.1.dylib (compatibility version 8.0.0, current version 8.2.0)
/opt/local/lib/libXrender.1.dylib (compatibility version 5.0.0, current version 5.0.0)
/opt/local/lib/libXinerama.1.dylib (compatibility version 2.0.0, current version 2.0.0)
/opt/local/lib/libXi.6.dylib (compatibility version 8.0.0, current version 8.0.0)
/opt/local/lib/libXrandr.2.dylib (compatibility version 5.0.0, current version 5.0.0)
/opt/local/lib/libXcursor.1.dylib (compatibility version 2.0.0, current version 2.2.0)
/opt/local/lib/libXcomposite.1.dylib (compatibility version 2.0.0, current version 2.0.0)
/opt/local/lib/libXdamage.1.dylib (compatibility version 3.0.0, current version 3.0.0)
/opt/local/lib/libXfixes.3.dylib (compatibility version 5.0.0, current version 5.0.0)
/opt/local/lib/libgdk_pixbuf-2.0.0.dylib (compatibility version 2801.0.0, current version 2801.0.0)
/opt/local/lib/libcairo.2.dylib (compatibility version 11203.0.0, current version 11203.14.0)
/opt/local/lib/libX11.6.dylib (compatibility version 10.0.0, current version 10.0.0)
/opt/local/lib/libXext.6.dylib (compatibility version 11.0.0, current version 11.0.0)
/opt/local/lib/libsqlite3.0.dylib (compatibility version 9.0.0, current version 9.6.0)
/opt/local/lib/libenchant.1.dylib (compatibility version 8.0.0, current version 8.0.0)
/opt/local/lib/libgmodule-2.0.0.dylib (compatibility version 3601.0.0, current version 3601.0.0)
/opt/local/lib/libgtksourceview-2.0.0.dylib (compatibility version 1.0.0, current version 1.0.0)
/opt/local/lib/libwebkitgtk-1.0.0.dylib (compatibility version 19.0.0, current version 19.5.0)
/opt/local/lib/libsoup-2.4.1.dylib (compatibility version 8.0.0, current version 8.0.0)
/opt/local/lib/libjavascriptcoregtk-1.0.0.dylib (compatibility version 14.0.0, current version 14.12.0)
/usr/lib/libstdc++.6.dylib (compatibility version 7.0.0, current version 52.0.0)