Bug#916183: tetraproc FTBFS due to freetype-config usage

[Adrian Bunk]

Source: tetraproc
Version: 0.8.2-2
Severity: serious
Tags: ftbfs

https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/tetraproc.html

...
g++  -O3 -Wall -MMD -MP -DVERSION=\"0.8.2\" -DSHARED=\"/usr/share/tetraproc\" -g -I/usr/X11R6/include `freetype-config --cflags`  -c -o tetraproc.o tetraproc.cc
/bin/sh: 1: freetype-config: not found
In file included from /usr/include/clxclient.h:31,
                 from styles.h:26,
                 from tetraproc.cc:27:
/usr/include/X11/Xft/Xft.h:39:10: fatal error: ft2build.h: No such file or directory
 #include <ft2build.h>
          ^~~~~~~~~~~~
compilation terminated.
make[1]: *** [<builtin>: tetraproc.o] Error 1


freetype-config has been removed in Debian in favour of pkg-config.

The package also lacks a direct build dependency on libfreetype6-dev.