ERROR: Service 'web' failed to build: The command '/bin/sh -c bundle install' returned a non-zero code: 5

[saroar]

    current directory: /usr/local/bundle/gems/pg-0.21.0/ext
/usr/local/bin/ruby -r ./siteconf20180214-7-1ubh2t0.rb extconf.rb
checking for pg_config... no
No pg_config... trying anyway. If building fails, please try again with
 --with-pg-config=/path/to/pg_config
checking for libpq-fe.h... no
Can't find the 'libpq-fe.h header
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers.  Check the mkmf.log file for more details.  You may
need configuration options.

Provided configuration options:
	--with-opt-dir
	--without-opt-dir
	--with-opt-include
	--without-opt-include=${opt-dir}/include
	--with-opt-lib
	--without-opt-lib=${opt-dir}/lib
	--with-make-prog
	--without-make-prog
	--srcdir=.
	--curdir
	--ruby=/usr/local/bin/$(RUBY_BASE_NAME)
	--with-pg
	--without-pg
	--enable-windows-cross
	--disable-windows-cross
	--with-pg-config
	--without-pg-config
	--with-pg_config
	--without-pg_config
	--with-pg-dir
	--without-pg-dir
	--with-pg-include
	--without-pg-include=${pg-dir}/include
	--with-pg-lib
	--without-pg-lib=${pg-dir}/lib

To see why this extension failed to compile, please check the mkmf.log which can
be found here:

  /usr/local/bundle/extensions/x86_64-linux/2.3.0/pg-0.21.0/mkmf.log

extconf failed, exit code 1

Gem files will remain installed in /usr/local/bundle/gems/pg-0.21.0 for
inspection.
Results logged to
/usr/local/bundle/extensions/x86_64-linux/2.3.0/pg-0.21.0/gem_make.out

An error occurred while installing pg (0.21.0), and Bundler cannot continue.
Make sure that `gem install pg -v '0.21.0'` succeeds before bundling.
ERROR: Service 'web' failed to build: The command '/bin/sh -c bundle install' returned a non-zero code: 5

 Running: 0
 Paused: 0
 Stopped: 1
Images: 9
Server Version: 17.12.0-ce
Storage Driver: overlay2
 Backing Filesystem: extfs
 Supports d_type: true
 Native Overlay Diff: true
Logging Driver: json-file
Cgroup Driver: cgroupfs
Plugins:
 Volume: local
 Network: bridge host ipvlan macvlan null overlay
 Log: awslogs fluentd gcplogs gelf journald json-file logentries splunk syslog
Swarm: inactive
Runtimes: runc
Default Runtime: runc
Init Binary: docker-init
containerd version: 89623f28b87a6004d4b785663257362d1658a729
runc version: b2567b37d7b75eb4cf325b77297b140ea686ce8f
init version: 949e6fa
Security Options:
 seccomp
  Profile: default
Kernel Version: 4.9.60-linuxkit-aufs
Operating System: Docker for Mac
OSType: linux
Architecture: x86_64
CPUs: 4
Total Memory: 1.952GiB
Name: linuxkit-025000000001
ID: BWEL:J4K2:RC5J:G7EY:B4DZ:3S2T:EOCJ:QNGK:MRBL:YK6H:4YXH:OWSI
Docker Root Dir: /var/lib/docker
Debug Mode (client): false
Debug Mode (server): true
 File Descriptors: 21
 Goroutines: 40
 System Time: 2018-02-14T20:10:53.462833659Z
 EventsListeners: 2
HTTP Proxy: docker.for.mac.http.internal:3128
HTTPS Proxy: docker.for.mac.http.internal:3129
Registry: https://index.docker.io/v1/
Labels:
Experimental: true
Insecure Registries:
 127.0.0.0/8
Live Restore Enabled: false```

MyMacBook have 8GB Rem MacBook PRo