graphics/gdal: /lib/libgcc_s.so.1 problem

[Rainer Hurling]

For some time now, I get the following message, when I use some of the 
GDAL tools (graphics/gdal) on FreeBSD HEAD (11.0-CURRENT r278036). For 
example, if I try:


#gdalinfo --version
ERROR 1: /lib/libgcc_s.so.1: version GCC_4.6.0 required by 
/usr/local/lib/gcc48/libgfortran.so.3 not found
ERROR 1: /lib/libgcc_s.so.1: version GCC_4.6.0 required by 
/usr/local/lib/gcc48/libgfortran.so.3 not found
GDAL 1.11.1, released 2014/09/24

Because of this, GDAL is not usable for me with ports like math/saga or 
graphics/qgis on HEAD. They core dump right after starting them.

The port graphics/gdal itself builds and installs fine. Don't know, if 
this is relevant: On my boxes, devel/libc++ is installed by other ports.

Obviously, there is something odd between clang (base) and gcc (ports). 
Is this a known problem?

Thanks for any help.

Regards,
Rainer Hurling