Bug#198584: fails to build from source: missing build-dep on pkgconfig?

[Philip Blundell <pb@nexus.co.uk>]

Package: xcursor
Version: 1.0.2-1

This is on arm, but it looks like similar things are happening on other
architectures.

** Using build dependencies supplied by package:
Build-Depends: debhelper (>> 4.0.0), xlibs-dev (>> 4.2.1), libxrender-dev, cdbs, autotools-dev
Checking for already installed source dependencies...
[...]
checking for IceConnectionNumber in -lICE... yes
checking for pkg-config... no
*** The pkg-config script could not be found. Make sure it is
*** in your path, or set the PKG_CONFIG environment variable
*** to the full path to pkg-config.
*** Or see http://www.freedesktop.org/software/pkgconfig to get pkg-config.
*** The pkg-config script could not be found. Make sure it is
*** in your path, or set the PKG_CONFIG environment variable
*** to the full path to pkg-config.
*** Or see http://www.freedesktop.org/software/pkgconfig to get pkg-config.
checking for X... libraries /usr/X11R6/lib, headers 
checking X11/extensions/Xrender.h usability... no
checking X11/extensions/Xrender.h presence... no
checking for X11/extensions/Xrender.h... no
configure: error: Xrender.h not found.
make: *** [config.status] Error 1