~$ sudo port -dv build mp3splt     
DEBUG: Found port in file:///opt/local/var/db/dports/sources/rsync.rsync.opendarwin.org_dpupdate_dports/audio/mp3splt
DEBUG: Changing to port directory: /opt/local/var/db/dports/sources/rsync.rsync.opendarwin.org_dpupdate_dports/audio/mp3splt
DEBUG: Requested variant powerpc is not provided by port mp3splt.
DEBUG: Requested variant darwin is not provided by port mp3splt.
DEBUG: Requested variant macosx is not provided by port mp3splt.
DEBUG: Found port in file:///opt/local/var/db/dports/sources/rsync.rsync.opendarwin.org_dpupdate_dports/audio/libogg
DEBUG: Changing to port directory: /opt/local/var/db/dports/sources/rsync.rsync.opendarwin.org_dpupdate_dports/audio/libogg
DEBUG: Searching for dependency: libogg
DEBUG: Found Dependency: receipt exists for libogg
DEBUG: Found port in file:///opt/local/var/db/dports/sources/rsync.rsync.opendarwin.org_dpupdate_dports/audio/libvorbis
DEBUG: Changing to port directory: /opt/local/var/db/dports/sources/rsync.rsync.opendarwin.org_dpupdate_dports/audio/libvorbis
DEBUG: Searching for dependency: libvorbis
DEBUG: Found Dependency: receipt exists for libvorbis
DEBUG: Found port in file:///opt/local/var/db/dports/sources/rsync.rsync.opendarwin.org_dpupdate_dports/audio/libmad
DEBUG: Changing to port directory: /opt/local/var/db/dports/sources/rsync.rsync.opendarwin.org_dpupdate_dports/audio/libmad
DEBUG: Searching for dependency: libmad
DEBUG: Found Dependency: receipt exists for libmad
DEBUG: Executing com.apple.main (mp3splt)
--->  Fetching mp3splt
DEBUG: Executing com.apple.fetch (mp3splt)
--->  Verifying checksum(s) for mp3splt
DEBUG: Executing com.apple.checksum (mp3splt)
--->  Checksumming mp3splt-2.1-src.tar.gz
DEBUG: Correct (md5) checksum for mp3splt-2.1-src.tar.gz
--->  Extracting mp3splt
DEBUG: Executing com.apple.extract (mp3splt)
--->  Extracting mp3splt-2.1-src.tar.gz
DEBUG: setting option extract.args to /opt/local/var/db/dports/distfiles/mp3splt/mp3splt-2.1-src.tar.gz
DEBUG: Assembled command: 'cd "/opt/local/var/db/dports/build/file._opt_local_var_db_dports_sources_rsync.rsync.opendarwin.org_dpupdate_dports_audio_mp3splt/work" && gzip -dc /opt/local/var/db/dports/distfiles/mp3splt/mp3splt-2.1-src.tar.gz | gnutar --no-same-owner -xf -'
DEBUG: Executing com.apple.patch (mp3splt)
--->  Applying patches to mp3splt
--->  Applying /opt/local/var/db/dports/sources/rsync.rsync.opendarwin.org_dpupdate_dports/audio/mp3splt/files/patch-ogg.c
DEBUG: Assembled command: 'cd "/opt/local/var/db/dports/build/file._opt_local_var_db_dports_sources_rsync.rsync.opendarwin.org_dpupdate_dports_audio_mp3splt/work/mp3splt-2.1" && patch -p0'
patching file ogg.c
--->  Configuring mp3splt
DEBUG: Executing com.apple.configure (mp3splt)
DEBUG: Assembled command: 'cd "/opt/local/var/db/dports/build/file._opt_local_var_db_dports_sources_rsync.rsync.opendarwin.org_dpupdate_dports_audio_mp3splt/work/mp3splt-2.1" && CPPFLAGS="-I/opt/local/include" LDFLAGS="-L/opt/local/lib" ./configure --prefix=/opt/local --mandir=/opt/local/share/man'
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for gawk... no
checking for mawk... no
checking for nawk... no
checking for awk... awk
checking whether make sets $(MAKE)... yes
checking for gcc... gcc
checking for C compiler default output... a.out
checking whether the C compiler works... yes
checking whether we are cross compiling... no
checking for suffix of executables... 
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ANSI C... none needed
checking for style of include used by make... GNU
checking dependency style of gcc... gcc3
checking for a BSD-compatible install... /usr/bin/install -c
checking whether ln -s works... yes
checking whether byte ordering is bigendian... yes
checking for an ANSI C-conforming const... yes
checking how to run the C preprocessor... gcc -E
checking for egrep... grep -E
checking for ANSI C header files... yes
checking for sys/types.h... yes
checking for sys/stat.h... yes
checking for stdlib.h... yes
checking for string.h... yes
checking for memory.h... yes
checking for strings.h... yes
checking for inttypes.h... yes
checking for stdint.h... yes
checking for unistd.h... yes
checking for stdlib.h... (cached) yes
checking for GNU libc compatible malloc... yes
checking for mad_frame_decode in -lmad... yes
checking for fseeko... yes
checking for Ogg... yes
checking for Vorbis... yes
configure: creating ./config.status
config.status: creating Makefile
config.status: creating doc/Makefile
config.status: creating config.h
config.status: executing depfiles commands
--->  Building mp3splt with target all
DEBUG: Executing com.apple.build (mp3splt)
DEBUG: Assembled command: 'cd "/opt/local/var/db/dports/build/file._opt_local_var_db_dports_sources_rsync.rsync.opendarwin.org_dpupdate_dports_audio_mp3splt/work/mp3splt-2.1" && make all'
make  all-recursive
Making all in doc
make[2]: Nothing to be done for `all'.
if gcc -DHAVE_CONFIG_H    -I/opt/local/include  -g -O2 -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -MT mp3splt.o -MD -MP -MF ".deps/mp3splt.Tpo" \
  -c -o mp3splt.o `test -f 'mp3splt.c' || echo './'`mp3splt.c; \
then mv -f ".deps/mp3splt.Tpo" ".deps/mp3splt.Po"; \
else rm -f ".deps/mp3splt.Tpo"; exit 1; \
fi
In file included from mp3splt.c:49:
splt.h:99: error: array type has incomplete element type
mp3splt.c: In function 'get_out_filename':
mp3splt.c:220: warning: pointer targets in passing argument 1 of 'strncat' differ in signedness
mp3splt.c: In function 'main':
mp3splt.c:341: warning: pointer targets in passing argument 1 of 'strncpy' differ in signedness
mp3splt.c:353: warning: pointer targets in passing argument 1 of 'strncpy' differ in signedness
mp3splt.c:380: warning: pointer targets in passing argument 1 of 'strncpy' differ in signedness
mp3splt.c:387: warning: pointer targets in passing argument 1 of 'strncpy' differ in signedness
mp3splt.c:435: error: type of formal parameter 2 is incomplete
mp3splt.c:618: warning: pointer targets in passing argument 1 of 'sprintf' differ in signedness
mp3splt.c:619: warning: pointer targets in passing argument 1 of 'check_ext' differ in signedness
mp3splt.c:623: warning: pointer targets in passing argument 2 of 'strncpy' differ in signedness
mp3splt.c:624: warning: pointer targets in passing argument 1 of 'sprintf' differ in signedness
mp3splt.c:626: warning: pointer targets in passing argument 2 of 'strcmp' differ in signedness
mp3splt.c:653: warning: pointer targets in passing argument 1 of 'fgets' differ in signedness
mp3splt.c:654: warning: pointer targets in passing argument 1 of 'strlen' differ in signedness
mp3splt.c:655: warning: pointer targets in passing argument 1 of 'strcmp' differ in signedness
mp3splt.c:659: warning: pointer targets in passing argument 1 of 'fgets' differ in signedness
mp3splt.c:661: warning: pointer targets in passing argument 1 of 'strlen' differ in signedness
mp3splt.c:662: warning: pointer targets in passing argument 1 of 'sscanf' differ in signedness
mp3splt.c:763: warning: pointer targets in passing argument 1 of 'sprintf' differ in signedness
mp3splt.c:764: warning: pointer targets in passing argument 1 of 'check_ext' differ in signedness
mp3splt.c:768: warning: pointer targets in passing argument 2 of 'strncpy' differ in signedness
mp3splt.c:769: warning: pointer targets in passing argument 1 of 'sprintf' differ in signedness
mp3splt.c:771: warning: pointer targets in passing argument 2 of 'strcmp' differ in signedness
mp3splt.c:871: warning: pointer targets in passing argument 1 of 'strncpy' differ in signedness
mp3splt.c:872: warning: pointer targets in passing argument 1 of 'strncpy' differ in signedness
mp3splt.c:873: warning: pointer targets in passing argument 1 of 'sprintf' differ in signedness
mp3splt.c:875: warning: pointer targets in passing argument 1 of 'sprintf' differ in signedness
mp3splt.c:880: warning: pointer targets in passing argument 2 of 'strncpy' differ in signedness
mp3splt.c:882: warning: pointer targets in passing argument 1 of 'sprintf' differ in signedness
mp3splt.c:885: warning: pointer targets in passing argument 1 of 'check_ext' differ in signedness
mp3splt.c:906: warning: pointer targets in passing argument 1 of 'strncpy' differ in signedness
mp3splt.c:916: warning: pointer targets in passing argument 2 of 'v_comment' differ in signedness
mp3splt.c:920: warning: pointer targets in passing argument 3 of 'id3' differ in signedness
mp3splt.c:933: warning: pointer targets in passing argument 2 of 'strncpy' differ in signedness
mp3splt.c:934: warning: pointer targets in passing argument 1 of 'sprintf' differ in signedness
mp3splt.c:937: warning: pointer targets in passing argument 2 of 'strcmp' differ in signedness
make[2]: *** [mp3splt.o] Error 1
make[1]: *** [all-recursive] Error 1
make: *** [all] Error 2
Error: Target com.apple.build returned: shell command "cd "/opt/local/var/db/dports/build/file._opt_local_var_db_dports_sources_rsync.rsync.opendarwin.org_dpupdate_dports_audio_mp3splt/work/mp3splt-2.1" && make all" returned error 2
Command output: mp3splt.c:623: warning: pointer targets in passing argument 2 of 'strncpy' differ in signedness
mp3splt.c:624: warning: pointer targets in passing argument 1 of 'sprintf' differ in signedness
mp3splt.c:626: warning: pointer targets in passing argument 2 of 'strcmp' differ in signedness
mp3splt.c:653: warning: pointer targets in passing argument 1 of 'fgets' differ in signedness
mp3splt.c:654: warning: pointer targets in passing argument 1 of 'strlen' differ in signedness
mp3splt.c:655: warning: pointer targets in passing argument 1 of 'strcmp' differ in signedness
mp3splt.c:659: warning: pointer targets in passing argument 1 of 'fgets' differ in signedness
mp3splt.c:661: warning: pointer targets in passing argument 1 of 'strlen' differ in signedness
mp3splt.c:662: warning: pointer targets in passing argument 1 of 'sscanf' differ in signedness
mp3splt.c:763: warning: pointer targets in passing argument 1 of 'sprintf' differ in signedness
mp3splt.c:764: warning: pointer targets in passing argument 1 of 'check_ext' differ in signedness
mp3splt.c:768: warning: pointer targets in passing argument 2 of 'strncpy' differ in signedness
mp3splt.c:769: warning: pointer targets in passing argument 1 of 'sprintf' differ in signedness
mp3splt.c:771: warning: pointer targets in passing argument 2 of 'strcmp' differ in signedness
mp3splt.c:871: warning: pointer targets in passing argument 1 of 'strncpy' differ in signedness
mp3splt.c:872: warning: pointer targets in passing argument 1 of 'strncpy' differ in signedness
mp3splt.c:873: warning: pointer targets in passing argument 1 of 'sprintf' differ in signedness
mp3splt.c:875: warning: pointer targets in passing argument 1 of 'sprintf' differ in signedness
mp3splt.c:880: warning: pointer targets in passing argument 2 of 'strncpy' differ in signedness
mp3splt.c:882: warning: pointer targets in passing argument 1 of 'sprintf' differ in signedness
mp3splt.c:885: warning: pointer targets in passing argument 1 of 'check_ext' differ in signedness
mp3splt.c:906: warning: pointer targets in passing argument 1 of 'strncpy' differ in signedness
mp3splt.c:916: warning: pointer targets in passing argument 2 of 'v_comment' differ in signedness
mp3splt.c:920: warning: pointer targets in passing argument 3 of 'id3' differ in signedness
mp3splt.c:933: warning: pointer targets in passing argument 2 of 'strncpy' differ in signedness
mp3splt.c:934: warning: pointer targets in passing argument 1 of 'sprintf' differ in signedness
mp3splt.c:937: warning: pointer targets in passing argument 2 of 'strcmp' differ in signedness
make[2]: *** [mp3splt.o] Error 1
make[1]: *** [all-recursive] Error 1
make: *** [all] Error 2

Warning: the following items did not execute (for mp3splt): com.apple.build
~$