[3dprinter-general] Bug#737942: cura-engine: FTBFS - pkg-config: not found

[Aaron M. Ucko]

Source: cura-engine
Version: 14.01-1
Severity: serious
Justification: fails to build from source

Builds of cura-engine in minimal environments, as on the autobuilders,
have been failing:

  g++ -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security -c -Wall -Wextra -O3 -fomit-frame-pointer `pkg-config --cflags polyclipping` bridge.cpp -o bridge.o
  /bin/sh: 1: pkg-config: not found
  In file included from sliceDataStorage.h:5:0,
                   from bridge.h:5,
                   from bridge.cpp:2:
  utils/intpoint.h:12:23: fatal error: clipper.hpp: No such file or directory
   #include <clipper.hpp>
                         ^
  compilation terminated.

Please declare a build dependency on pkg-config (without which the
compiler won't know to look in /usr/include/polyclipping), and confirm
with pbuilder or the like that you haven't missed any others.

Thanks!