pkg-config fails to find libsystemd for some docker base-images

When attempting to compile an application that depends on go-systemd, I get error messages from pkg-config failing to find lsystemd. I've produced this on images derived from golang:1.5 and ubuntu:14.04 with dockerfiles along these lines:

FROM golang:1.5
RUN apt-get update
RUN apt-get -y install build-essentials pkg-config libsystemd-journal-dev
# compile go application here

I've gotten a range of different errors by playing with the combination of the many transitional libsystemd packages that I install:

# pkg-config --cflags libsystemd
Package libsystemd was not found in the pkg-config search path.
Perhaps you should add the directory containing `libsystemd.pc'
to the PKG_CONFIG_PATH environment variable
No package 'libsystemd' found
pkg-config: exit status 1

# pkg-config --cflags libsystemd-journal
Package libsystemd-journal was not found in the pkg-config search path.
Perhaps you should add the directory containing `libsystemd-journal.pc'
to the PKG_CONFIG_PATH environment variable
No package 'libsystemd-journal' found
pkg-config: exit status 1

# github.com/coreos-inc/quay-builder
/usr/local/go/pkg/tool/linux_amd64/link: running gcc failed: exit status 1
/usr/bin/ld: cannot find -lsystemd
collect2: error: ld returned 1 exit status

Reproduce the failure with Dockerfiles based on golang:1.5 and ubuntu:14.04, then run the shown pkg-config commands and compile the Go application. Done means the relevant libsystemd package is discoverable and the application links successfully on the affected base images.