"configure: error: Package requirements (blkid) were not met"

I'm trying to build btrfs-progs from sources, but when I run ./configure I get the error: checking for BLKID... no configure: error: Package requirements (blkid) were not met: No package 'blkid' found Consider adjusting the PKG_CONFIG_PATH environment variable if you installed software in a non-standard prefix. Alternatively, you may set the environment variables BLKID_CFLAGS and BLKID_LIBS to avoid the need to call pkg-config. See the pkg-config man page for more details. blkid is installed in /sbin so, presumably, all its libraries are in the default locations. What do I need to do tell pkg-config where blkid is or am I actually missing a package? FYI: I'm running Debian 8 (sid/unstable) with a 4.1.0 kernel built from github.com/torvalds/linux.git sources about a week ago (commit:g6aaf0da).