"Warning: All compilers are either blacklisted or unavailable; defaulting to first fallback option" [What's the meaning of this output line?]

[Kurt Pfeifle]

When trying to install some ports on a newly upgraded Yosemite system, I
get these lines:

Warning: All compilers are either blacklisted or unavailable;
defaulting to first fallback option

For example, it happens for the sam2p port. Here this line is repeated
about two dozen times even:

--->  Configuring sam2p
Warning: All compilers are either blacklisted or unavailable;
defaulting to first fallback option
Warning: All compilers are either blacklisted or unavailable;
defaulting to first fallback option
Warning: All compilers are either blacklisted or unavailable;
defaulting to first fallback option
Warning: All compilers are either blacklisted or unavailable;
defaulting to first fallback option
Warning: All compilers are either blacklisted or unavailable;
defaulting to first fallback option
Warning: All compilers are either blacklisted or unavailable;
defaulting to first fallback option
Warning: All compilers are either blacklisted or unavailable;
defaulting to first fallback option
Warning: All compilers are either blacklisted or unavailable;
defaulting to first fallback option
Warning: All compilers are either blacklisted or unavailable;
defaulting to first fallback option
Warning: All compilers are either blacklisted or unavailable;
defaulting to first fallback option
Warning: All compilers are either blacklisted or unavailable;
defaulting to first fallback option
Warning: All compilers are either blacklisted or unavailable;
defaulting to first fallback option
Warning: All compilers are either blacklisted or unavailable;
defaulting to first fallback option
Warning: All compilers are either blacklisted or unavailable;
defaulting to first fallback option
Warning: All compilers are either blacklisted or unavailable;
defaulting to first fallback option
Warning: All compilers are either blacklisted or unavailable;
defaulting to first fallback option
Warning: All compilers are either blacklisted or unavailable;
defaulting to first fallback option
Warning: All compilers are either blacklisted or unavailable;
defaulting to first fallback option
Error: Failed to configure sam2p, consult
/opt/local/var/macports/build/_opt_local_var_macports_sources_fco.it.rsync.macports.org_macports-release_tarballs_ports_graphics_sam2p/sam2p/work/sam2p-0.49.2/config.log
Error: org.macports.configure for port sam2p returned: configure
failure: command execution failed
Please see the log file for port sam2p for details:
    /opt/local/var/macports/logs/_opt_local_var_macports_sources_fco.it.rsync.macports.org_macports-release_tarballs_ports_graphics_sam2p/sam2p/main.log
To report a bug, follow the instructions in the guide:
    http://guide.macports.org/#project.tickets
Error: Processing of port sam2p failed

The last lines of the main.log logfile are:

:info:configure config.status: config.h is unchanged
:info:configure running make Makedep...
:info:configure error
:info:configure configure: error: cannot compute depends
:info:configure Command failed:  cd
"/opt/local/var/macports/build/_opt_local_var_macports_sources_fco.it.rsync.macports.org_macports-release_tarballs_ports_graphics_sam2p/sam2p/work/sam2p-0.49.2"
&& ./configure --prefix=/opt/local --enable-lzw --enable-gif
:info:configure Exit code: 1
:error:configure Failed to configure sam2p, consult
/opt/local/var/macports/build/_opt_local_var_macports_sources_fco.it.rsync.macports.org_macports-release_tarballs_ports_graphics_sam2p/sam2p/work/sam2p-0.49.2/config.log
:error:configure org.macports.configure for port sam2p returned:
configure failure: command execution failed
:debug:configure Error code: NONE
:debug:configure Backtrace: configure failure: command execution failed
    while executing
"portconfigure::configure_main org.macports.configure"
    ("eval" body line 1)
    invoked from within
"eval $procedure $targetname"
:info:configure Warning: targets not executed for sam2p:
org.macports.activate org.macports.configure org.macports.build
org.macports.destroot org.macports.install
:notice:configure Please see the log file for port sam2p for details:
    /opt/local/var/macports/logs/_opt_local_var_macports_sources_fco.it.rsync.macports.org_macports-release_tarballs_ports_graphics_sam2p/sam2p/main.log

Inside the config.log file, I find these lines:

[...]
+ ccache /usr/bin/clang++ -DOBJDEP -M -MG -E 2>&1 appliers.cpp
c_lgcc.cpp c_lgcc3.cpp cgif.c crc32.c encoder.cpp error.cpp gensi.cpp
gensio.cpp image.cpp in_bmp.cpp in_gif.cpp in_jai.cpp in_jpeg.cpp
in_lbm.cpp in_pcx.cpp in_png.cpp in_pn
m.cpp in_ps.cpp in_tga.cpp in_tiff.cpp in_xpm.cpp jpegdump_main.cpp
mapping.cpp minips.cpp out_gif.cpp ps_tiny.c pts_defl.c pts_fax.c
pts_lzw.c rule.cpp sam2p_main.cpp snprintf.c StdAfx.cpp test_main.cpp
testfax_main.c vcsam2p.cpp
+ ccache /usr/bin/clang++ -DOBJDEP -E 2>&1 >/dev/null appliers.cpp
c_lgcc.cpp c_lgcc3.cpp cgif.c crc32.c encoder.cpp error.cpp gensi.cpp
gensio.cpp image.cpp in_bmp.cpp in_gif.cpp in_jai.cpp in_jpeg.cpp
in_lbm.cpp in_pcx.cpp in_png.cpp i
n_pnm.cpp in_ps.cpp in_tga.cpp in_tiff.cpp in_xpm.cpp
jpegdump_main.cpp mapping.cpp minips.cpp out_gif.cpp ps_tiny.c
pts_defl.c pts_fax.c pts_lzw.c rule.cpp sam2p_main.cpp snprintf.c
StdAfx.cpp test_main.cpp testfax_main.c vcsam2p.cpp
./ccdep.pl: invalid depret: [clang: warning: treating 'c' input as
'c++' when in C++ mode, this behavior is deprecated]
make: *** [Makedep] Error 1
configure:7510: result: error
configure:7512: error: cannot compute depends

I do not fully understand what this means.

Is it possibly for me to resolve tis somehow, or is this a bug in MacPorts ?
​
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