Firefox dfport problem?

[Adam K Kirchhoff]

/usr/local/bin/gmake -C ../../security/coreconf
MAKE="/usr/local/bin/gmake -j1" -j1
MOZILLA_INCLUDES="-I/usr/dfports/www/firefox/work/mozilla/dist/include/nspr
-I/usr/dfports/www/firefox/work/mozilla/dist/include/dbm"
SOURCE_MD_DIR=/usr/dfports/www/firefox/work/mozilla/dist
DIST=/usr/dfports/www/firefox/work/mozilla/dist MOZILLA_CLIENT=1
NO_MDUPDATE=1 BUILD_OPT=1 NS_USE_GCC=1 NS_USE_NATIVE= clean
gmake[3]: Entering directory
`/usr/dfports/www/firefox/work/mozilla/security/coreconf'
/usr/local/bin/gmake -j1: *** No rule to make target
. ./coreconf/rules.mk.  Stop.
gmake[3]: *** [../coreconf/rules.mk] Error 1
gmake[3]: Leaving directory
`/usr/dfports/www/firefox/work/mozilla/security/coreconf'
gmake[2]: *** [.nss.cleaned] Error 2
gmake[2]: Leaving directory
`/usr/dfports/www/firefox/work/mozilla/security/manager'
gmake[1]: *** [tier_40] Error 2
gmake[1]: Leaving directory `/usr/dfports/www/firefox/work/mozilla'
gmake: *** [default] Error 2
*** Error code 2

And yet rules.mk does exist in the coreconf directory.  Any ideas? 

Adam