Makefile: check dependencies before installation.

So that the packager will know what are dependencied when they are
making a new package.

.travis.yml

@@ -1,6 +1,10 @@
 os:
   - linux
   - osx
+addons:
+  apt:
+    packages:
+    - bsdmainutils
 script:
   - ./check_integrity.sh $(find bin | cut -b 5- | xargs)
   # Test for the brew release

Makefile

@@ -25,7 +25,12 @@ default: install
 
 docs: $(MAN_HTML) $(MAN_PAGES)
 
-install:
+check:
+	@echo "Check dependencies before installation"
+	@./check_dependencies.sh
+	@echo
+
+install: check
 	@if [ "$(INSTALL_VIA)" = brew ]; then \
 		git apply brew-release.patch || { echo "Can't apply brew release patch"; exit 1; } \
 	fi
@@ -120,4 +125,4 @@ docclean:
 	rm -f man/*.1
 	rm -f man/*.html
 
-.PHONY: default docs clean docclean install uninstall
+.PHONY: default docs clean docclean check install uninstall

check_dependencies.sh

@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+
+err() {
+    echo >&2 "$1"
+    exit 1
+}
+
+if ! test "$(which column)"; then
+    err "Need to install dependency 'column' before installation"
+fi