parallel make failure?

[Gedare Bloom]

I'm building a clean master with current tools and observed the
following using make -j4:

/usr/bin/install -c -m 644
../../../../../../rtems/c/src/libchip/i2c/i2c-ds1621.h
../../../erc32/lib/include/libchip/i2c-ds1621.h
/usr/bin/install: cannot create regular file
'../../../erc32/lib/include/libchip/ds1375-rtc.h': File exists
Makefile:2147: recipe for target
'../../../erc32/lib/include/libchip/ds1375-rtc.h' failed
make[5]: *** [../../../erc32/lib/include/libchip/ds1375-rtc.h] Error 1
make[5]: Leaving directory
'/home/gedare/work/rtems/builds/b-erc32/sparc-rtems4.12/c/erc32/libchip'
Makefile:916: recipe for target 'preinstall-libchip' failed
make[4]: *** [preinstall-libchip] Error 1

With just 'make' it passes this step.