vagrant build: ld linker "no space left" (there is space)

fresh vagrant up:

    default: [ 97%] Linking CXX executable ../target/etoad
    default: /usr/bin/ld: final link failed: No space left on device
    default: collect2: error: ld returned 1 exit status
    default: src/CMakeFiles/etoad.dir/build.make:176: recipe for target 'target/etoad' failed
    default: make[3]: *** [target/etoad] Error 1
    default: make[3]: Leaving directory '/var/www/etoa/eventhandler'
    default: CMakeFiles/Makefile2:147: recipe for target 'src/CMakeFiles/etoad.dir/all' failed
    default: make[2]: Leaving directory '/var/www/etoa/eventhandler'
    default: Makefile:129: recipe for target 'all' failed
    default: make[1]: Leaving directory '/var/www/etoa/eventhandler'
    default: make[2]: *** [src/CMakeFiles/etoad.dir/all] Error 2
    default: make[1]: *** [all] Error 2
    default: Makefile:27: recipe for target 'eventhandler' failed
    default: make: *** [eventhandler] Error 2

there is still space on device (around 7% used)
there are free inodes (around 3% used)
/tmp/ is not on a separate filesystem or anything (standard debian/ubuntu)
box image and virtualbox up-to-date

etoa / etoa-gui

vagrant build: ld linker "no space left" (there is space) #493