Steps to reproduce.

1. svn checkout https://svn.FreeBSD.org/base/head /usr/src
2. svn update /usr/src
/* At revision 328635. */
3. make -jX buildworld

Looks like we're missing a backslash at the end of line 38.
>>>>.if ${MACHINE_CPUARCH} != "mips" && ${MACHINE_CPUARCH} != "arm" &&
>>>>    ${MACHINE_CPUARCH} != "powerpc"

--- cleandir_subdir_lib/libgcc_s ---
make[4]: "/usr/src/lib/libgcc_s/Makefile" line 38: Malformed conditional (${MACHINE_CPUARCH} != "mips" && ${MACHINE_CPUARCH} != "arm" &&)
--- cleandir_subdir_usr.bin ---
--- cleandepend ---
rm -f .depend .depend.* GPATH GRTAGS GSYMS GTAGS
--- cleandir_subdir_usr.sbin ---
--- cleandir_subdir_usr.sbin/bluetooth/bthidcontrol ---
===> usr.sbin/bluetooth/bthidcontrol (cleandir)
--- cleandir_subdir_usr.bin ---
--- cleanobj ---
--- cleandir_subdir_usr.bin/tee ---
===> usr.bin/tee (cleandir)
--- cleandir_subdir_lib ---
--- cleandir_subdir_lib/libthr ---
--- clean ---
rm -f  fpu_test.full.bc fpu_test.full.ll fpu_test fpu_test.bc fpu_test.ll fpu_test.full fpu_test.debug t_fpu.o t_fpu.bco t_fpu.llo
--- cleandir_subdir_usr.sbin ---
--- clean ---
--- cleandir_subdir_lib ---
--- cleanobj ---
--- join_test.cleandir ---
(cd /usr/src/lib/libthr/tests &&  DEPENDFILE=.depend.join_test  NO_SUBDIR=1 make -f Makefile _RECURSING_PROGS=t  CLEANDEPENDFILES= CLEANDEPENDDIRS= PROG=join_test  cleandir)
--- cleandir_subdir_usr.sbin ---
rm -f bthidcontrol.full.bc bthidcontrol.full.ll bthidcontrol bthidcontrol.bc bthidcontrol.ll bthidcontrol.full bthidcontrol.debug bthidcontrol.o hid.o lexer.o parser.o sdp.o bthidcontrol.bco hid.bco lexer.bco parser.bco sdp.bco bthidcontrol.llo hid.llo lexer.llo parser.llo sdp.llo bthidcontrol.8.gz bthidcontrol.8.cat.gz lexer.c parser.c parser.h
--- cleandepend ---
rm -f .depend .depend.* GPATH GRTAGS GSYMS GTAGS
--- cleanobj ---
--- cleandir_subdir_usr.sbin/bluetooth/bthidd ---
===> usr.sbin/bluetooth/bthidd (cleandir)
--- cleandir_subdir_lib ---
--- cleandir_subdir_lib/libgcc_s ---
make[4]: Fatal errors encountered -- cannot continue
make[4]: stopped in /usr/src/lib/libgcc_s
*** [cleandir_subdir_lib/libgcc_s] Error code 1

make[3]: stopped in /usr/src/lib
--- cleandir_subdir_usr.bin ---
A failure has been detected in another branch of the parallel make

Thanks
-V