Hello, I've been trying to compile the unix headless binaries per the doc in an Ubuntu container (same base container I've used to build numerous other coin code) with all listed pre-reqs, but the make fails immdiately:

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root@6e14f56a7f01:~/gtoken/src# make -f makefile.unix
g++ -c -O2  -pthread -Wall -Wextra -Wno-ignored-qualifiers -Wformat -Wformat-security -Wno-unused-parameter -g -DBOOST_SPIRIT_THREADSAFE -I/root/gtoken/src -I/root/gtoken/src/obj -DUSE_UPNP=1 -I/root/gtoken/src/leveldb/include -I/root/gtoken/src/leveldb/helpers -DHAVE_BUILD_INFO -fno-stack-protector -fstack-protector-all -Wstack-protector -D_FORTIFY_SOURCE=2  -MMD -MF obj/alert.d -o obj/alert.o alert.cpp
alert.cpp:273:1: fatal error: opening dependency file obj/alert.d: No such file or directory
 }
 ^
compilation terminated.
makefile.unix:167: recipe for target 'obj/alert.o' failed
make: *** [obj/alert.o] Error 1

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I didn't jump straight to opening an issue as perhaps I've missed something simple, anyone here have experience compiling this?