Strange compile problems

[Chewi]

I was doing an emerge -u world and all was going well until it got to some audio-related packages towards the end. The errors don't seem to be anything audio-related and perhaps this is just a coincidence but it's get me totally puzzled. The packages I'm having problems with are ladcca-0.3.1, gst-plugins-0.6.2-r1 and jack-audio-connection-kit-0.75.0. They all throw back very similar errors about files not being found. I have managed to compile some other packages okay since this has happened.

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...
Making all in ladcca
make[2]: Entering directory `/var/tmp/portage/ladcca-0.3.1/work/ladcca-0.3.1/ladcca'
make[2]: Nothing to be done for `all'.
make[2]: Leaving directory `/var/tmp/portage/ladcca-0.3.1/work/ladcca-0.3.1/ladcca'
Making all in libladcca
make[2]: Entering directory `/var/tmp/portage/ladcca-0.3.1/work/ladcca-0.3.1/libladcca'
source='config.c' object='libladcca_la-config.lo' libtool=yes \
depfile='.deps/libladcca_la-config.Plo' tmpdepfile='.deps/libladcca_la-config.TPlo' \
depmode=gcc3 /bin/sh ../depcomp \
/bin/sh ../libtool --mode=compile /usr/bin/gcc -DHAVE_CONFIG_H -I. -I. -I.. -I.. -g -DLADCCA_BUILD -DHAVE_LADCCA -g -O2 -c -o libladcca_la-config.lo `test -f 'config.c' || echo './'`config.c
rm -f .libs/libladcca_la-config.lo
/usr/bin/gcc -DHAVE_CONFIG_H -I. -I. -I.. -I.. -g -DLADCCA_BUILD -DHAVE_LADCCA -g -O2 -c config.c -MT libladcca_la-config.lo -MD -MP -MF .deps/libladcca_la-config.TPlo -fPIC -DPIC
mv -f libladcca_la-config.o .libs/libladcca_la-config.lo
mv: cannot stat `libladcca_la-config.o': No such file or directory
make[2]: *** [libladcca_la-config.lo] Error 1
make[2]: Leaving directory `/var/tmp/portage/ladcca-0.3.1/work/ladcca-0.3.1/libladcca'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/var/tmp/portage/ladcca-0.3.1/work/ladcca-0.3.1'
make: *** [all] Error 2
----------------
...
Making all in audio
make[4]: Entering directory `/var/tmp/portage/gst-plugins-0.6.2-r1/work/gst-plugins-0.6.2/gst-libs/gst/audio'
source='audio.c' object='libgstaudio_la-audio.lo' libtool=yes \
depfile='.deps/libgstaudio_la-audio.Plo' tmpdepfile='.deps/libgstaudio_la-audio.TPlo' \
depmode=gcc3 /bin/sh ../../../depcomp \
/bin/sh ../../../libtool --mode=compile /usr/bin/gcc -DHAVE_CONFIG_H -I. -I. -I../../.. -I../../../gst-libs -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -pthread -I/usr/include/gstreamer-0.6 -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/libxml2 -DGST_DISABLE_DEPRECATED -g -finline-functions -ffast-math -O2 -march=i586 -pipe -O3 -c -o libgstaudio_la-audio.lo `test -f 'audio.c' || echo './'`audio.c
/usr/bin/gcc -DHAVE_CONFIG_H -I. -I. -I../../.. -I../../../gst-libs -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -pthread -I/usr/include/gstreamer-0.6 -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/libxml2 -DGST_DISABLE_DEPRECATED -g -finline-functions -ffast-math -O2 -march=i586 -pipe -O3 -c audio.c -MT libgstaudio_la-audio.lo -MD -MP -MF .deps/libgstaudio_la-audio.TPlo -fPIC -DPIC
mv -f libgstaudio_la-audio.o libgstaudio_la-audio.lo
mv: cannot stat `libgstaudio_la-audio.o': No such file or directory
make[4]: *** [libgstaudio_la-audio.lo] Error 1
make[4]: Leaving directory `/var/tmp/portage/gst-plugins-0.6.2-r1/work/gst-plugins-0.6.2/gst-libs/gst/audio'
make[3]: *** [all-recursive] Error 1
make[3]: Leaving directory `/var/tmp/portage/gst-plugins-0.6.2-r1/work/gst-plugins-0.6.2/gst-libs/gst'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory `/var/tmp/portage/gst-plugins-0.6.2-r1/work/gst-plugins-0.6.2/gst-libs'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/var/tmp/portage/gst-plugins-0.6.2-r1/work/gst-plugins-0.6.2'
make: *** [all] Error 2
----------------
...
Making all in libjack
make[2]: Entering directory `/var/tmp/portage/jack-audio-connection-kit-0.75.0/work/jack-audio-connection-kit-0.75.0/libjack'
source='shm.c' object='libjack_la-shm.lo' libtool=yes \
depfile='.deps/libjack_la-shm.Plo' tmpdepfile='.deps/libjack_la-shm.TPlo' \
depmode=gcc3 /bin/sh ../depcomp \
/bin/sh ../libtool --mode=compile /usr/bin/gcc -DHAVE_CONFIG_H -I. -I. -I.. -I.. -D_REENTRANT -D_POSIX_PTHREAD_SEMANTICS -Wall -O3 -fomit-frame-pointer -ffast-math -fstrength-reduce -funroll-loops -fmove-all-movables -I.. -D_REENTRANT -D_POSIX_PTHREAD_SEMANTICS -Wall -O3 -fomit-frame-pointer -ffast-math -fstrength-reduce -funroll-loops -fmove-all-movables -march=i586 -c -o libjack_la-shm.lo `test -f 'shm.c' || echo './'`shm.c
rm -f .libs/libjack_la-shm.lo
/usr/bin/gcc -DHAVE_CONFIG_H -I. -I. -I.. -I.. -D_REENTRANT -D_POSIX_PTHREAD_SEMANTICS -Wall -O3 -fomit-frame-pointer -ffast-math -fstrength-reduce -funroll-loops -fmove-all-movables -I.. -D_REENTRANT -D_POSIX_PTHREAD_SEMANTICS -Wall -O3 -fomit-frame-pointer -ffast-math -fstrength-reduce -funroll-loops -fmove-all-movables -march=i586 -c shm.c -MT libjack_la-shm.lo -MD -MP -MF .deps/libjack_la-shm.TPlo -fPIC -DPIC
mv -f libjack_la-shm.o .libs/libjack_la-shm.lo
mv: cannot stat `libjack_la-shm.o': No such file or directory
make[2]: *** [libjack_la-shm.lo] Error 1
make[2]: Leaving directory `/var/tmp/portage/jack-audio-connection-kit-0.75.0/work/jack-audio-connection-kit-0.75.0/libjack'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/var/tmp/portage/jack-audio-connection-kit-0.75.0/work/jack-audio-connection-kit-0.75.0'
make: *** [all] Error 2
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Any ideas?